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October

| Event Location: Hennings 201 (or via zoom) | Speaker: Richard Shaw (UBC)

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CHIME will use Intensity Mapping of the 21cm line of neutral hydrogen to map
large-scale structure between redshifts of 0.8 and 2.5. By measuring Baryon
Acoustic Oscillations (BAO) we will place constraints on the dark energy 
equation of state as it begins to dominate the expansion of the Universe,
particularly at redshifts poorly probed by current BAO surveys.

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Add to Calendar 2021-10-28T16:00:00 2021-10-28T17:00:00 First detection of cosmological signal with CHIME CHIME will use Intensity Mapping of the 21cm line of neutral hydrogen to map large-scale structure between redshifts of 0.8 and 2.5. By measuring Baryon Acoustic Oscillations (BAO) we will place constraints on the dark energy  equation of state as it begins to dominate the expansion of the Universe, particularly at redshifts poorly probed by current BAO surveys. Event Location: Hennings 201 (or via zoom)

October

| Event Location: https://ubc.zoom.us/j/66879995529?pwd=dHpQb25LSGVZK3ozY243em5tenRWQT09 Meeting ID: 668 7999 5529 Passcode: 113399 | Speaker: Prof. Shanti Deemyad, University of Utah

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Restricting the volume of a material, through application of pressure, changes the dominance of interactions within the material, and exposes unnatural states of matter not found in our predominantly adiabatic universe.  One of the most exotic phenomena in condensed matter is the phase transitions purely driven by quantum effects. While quantum fluctuations in electronic states are always relevant, it is also possible to observe quantum effects in lattice of very light elements. At ambient conditions, the lightest metal of the periodic system is lithium.

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Add to Calendar 2021-10-28T10:00:00 2021-10-28T11:00:00 Shanti Deemyad: Physics of Light Dense Matter: Quantum and Classical Effects in Dense lithium Restricting the volume of a material, through application of pressure, changes the dominance of interactions within the material, and exposes unnatural states of matter not found in our predominantly adiabatic universe.  One of the most exotic phenomena in condensed matter is the phase transitions purely driven by quantum effects. While quantum fluctuations in electronic states are always relevant, it is also possible to observe quantum effects in lattice of very light elements. At ambient conditions, the lightest metal of the periodic system is lithium. Event Location: https://ubc.zoom.us/j/66879995529?pwd=dHpQb25LSGVZK3ozY243em5tenRWQT09 Meeting ID: 668 7999 5529 Passcode: 113399

October

| Event Location: Connect via zoom | Speaker: Adam Smercina (U Washington)

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The hierarchical formation of galaxies like the Milky Way (MW) is a central prediction of the Lambda-Cold Dark Matter (LCDM) model. They are predicted and observed to host vast halos of stars accreted from disrupted dwarf galaxies, as well as rich dwarf satellite populations — both of which tantalizingly encode details of their formation histories. This regime has long been problematic for galaxy formation models, due to the required resolution, and observational progress has been largely constrained to the Local Group, due to the intrinsic faintness and large scales of both features.

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Add to Calendar 2021-10-25T15:00:00 2021-10-25T16:00:00 Relating the Diverse Merger Histories and Satellite Populations of Nearby Galaxies The hierarchical formation of galaxies like the Milky Way (MW) is a central prediction of the Lambda-Cold Dark Matter (LCDM) model. They are predicted and observed to host vast halos of stars accreted from disrupted dwarf galaxies, as well as rich dwarf satellite populations — both of which tantalizingly encode details of their formation histories. This regime has long been problematic for galaxy formation models, due to the required resolution, and observational progress has been largely constrained to the Local Group, due to the intrinsic faintness and large scales of both features. Event Location: Connect via zoom

October

| Event Location: Connect via zoom | Speaker: Marc Kamionkowski (Johns Hopkins)

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The value of the cosmic expansion rate (the Hubble constant) inferred from observations of supernovae disagree with those inferred from measurements of the cosmic microwave background.  Easy explanations for this discrepancy have been elusive, but the past few years attention has turned to the possibility that a modification to early-Universe physics may be required.  I will discuss a solution to this "Hubble tension" that involves the introduction of a new component of matter, “early dark energy,” as well as other related ideas.

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Add to Calendar 2021-10-21T16:00:00 2021-10-21T17:00:00 The Hubble tension and the early Universe The value of the cosmic expansion rate (the Hubble constant) inferred from observations of supernovae disagree with those inferred from measurements of the cosmic microwave background.  Easy explanations for this discrepancy have been elusive, but the past few years attention has turned to the possibility that a modification to early-Universe physics may be required.  I will discuss a solution to this "Hubble tension" that involves the introduction of a new component of matter, “early dark energy,” as well as other related ideas. Event Location: Connect via zoom

October

| Event Location: https://ubc.zoom.us/j/66879995529?pwd=dHpQb25LSGVZK3ozY243em5tenRWQT09 Meeting ID: 668 7999 5529 Passcode: 113399 | Speaker: Prof. Vedika Khemani, Stanford University

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Abstract: The addition of non-unitary ingredients to many-body quantum dynamics has led to a series of exciting developments in recent years, including new out-of-equilibrium entanglement phases and phase transitions enabled by quantum measurements.

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Add to Calendar 2021-10-21T10:00:00 2021-10-21T11:00:00 Vedika Khemani: Non-unitary dynamics via spacetime duality Abstract: The addition of non-unitary ingredients to many-body quantum dynamics has led to a series of exciting developments in recent years, including new out-of-equilibrium entanglement phases and phase transitions enabled by quantum measurements. Event Location: https://ubc.zoom.us/j/66879995529?pwd=dHpQb25LSGVZK3ozY243em5tenRWQT09 Meeting ID: 668 7999 5529 Passcode: 113399

October

| Event Location: Connect via zoom | Speaker: Joe DeRose (UC Berkeley)

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Cross-correlations between imaging and redshift surve

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Add to Calendar 2021-10-18T15:00:00 2021-10-18T16:00:00 Robust cosmological inference from galaxy clustering and weak lensing using cosmological simulations Cross-correlations between imaging and redshift surve Event Location: Connect via zoom

October

| Event Location: Hennings 201 or via zoom | Speaker: James Charbonneau & Philip Stamp

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Let's discuss the background to the 2 parts of this year's Nobel Prize in Physics.

James Charbonneau - CLIMATE SCIENCE

This will be a short description of how Syukuro Manabe and Klaus Hasselmann were jointly awarded half of the 2021 prize "for the physical modelling of Earth's climate, quantifying variability and reliably predicting global warming".

Philip Stamp - SPIN GLASSES & COMPLEXITY

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Add to Calendar 2021-10-14T16:00:00 2021-10-14T17:00:00 This year's Physics Nobel Prize Let's discuss the background to the 2 parts of this year's Nobel Prize in Physics. James Charbonneau - CLIMATE SCIENCE This will be a short description of how Syukuro Manabe and Klaus Hasselmann were jointly awarded half of the 2021 prize "for the physical modelling of Earth's climate, quantifying variability and reliably predicting global warming". Philip Stamp - SPIN GLASSES & COMPLEXITY Event Location: Hennings 201 or via zoom

October

| Event Location: https://ubc.zoom.us/j/66879995529?pwd=dHpQb25LSGVZK3ozY243em5tenRWQT09 Meeting ID: 668 7999 5529 Passcode: 113399 | Speaker: Andrew Potter

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Abstract: Quantum computation tantalizing promises efficient solutions to a broad range of classically-hard materials and chemistry simulation problems of interest to both basic science and practical applications. However, nascent quantum processors are severely limited in both memory and accuracy, and remain a long way from surpassing state-of-the-art classical computational methods.

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Add to Calendar 2021-10-14T10:00:00 2021-10-14T11:00:00 CM Seminar - Andrew Potter: Simulating highly-entangled matter with quantum tensor networks Abstract: Quantum computation tantalizing promises efficient solutions to a broad range of classically-hard materials and chemistry simulation problems of interest to both basic science and practical applications. However, nascent quantum processors are severely limited in both memory and accuracy, and remain a long way from surpassing state-of-the-art classical computational methods. Event Location: https://ubc.zoom.us/j/66879995529?pwd=dHpQb25LSGVZK3ozY243em5tenRWQT09 Meeting ID: 668 7999 5529 Passcode: 113399

October

| Event Location: Connect via zoom | Speaker: Johanna Wagstaffe (CBC)

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The deadly heat dome that settled over the Pacific Northwest at the end of June 2021 was a 1 in 1000 year event. But climate scientists say it was 150 times more likely to happen because of human-caused climate change. I'll take you through the series of unique conditions that came together for the unprecedented event to occur -- and why we need to prepare now for the next one. 

Please note the later starting time: 4.15pm

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Add to Calendar 2021-10-07T16:15:00 2021-10-07T17:15:00 2021 Heat Dome: An extremely rare event that we will likely see again The deadly heat dome that settled over the Pacific Northwest at the end of June 2021 was a 1 in 1000 year event. But climate scientists say it was 150 times more likely to happen because of human-caused climate change. I'll take you through the series of unique conditions that came together for the unprecedented event to occur -- and why we need to prepare now for the next one.  Please note the later starting time: 4.15pm Event Location: Connect via zoom

October

| Event Location: https://ubc.zoom.us/j/66879995529?pwd=dHpQb25LSGVZK3ozY243em5tenRWQT09 Meeting ID: 668 7999 5529 Passcode: 113399 |

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Short-range magnetic correlations have been increasingly recognized in recent years for their importance in contexts as widely varied as geometrically frustrated magnetism and functional magnetocaloric materials. Neutron scattering provides experimental access to these short-range correlations through magnetic diffuse scattering, but characterizing magnetic short-range order with quantitative accuracy has remained a difficult task.

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Add to Calendar 2021-10-07T10:00:00 2021-10-07T11:00:00 CM Seminar - From Quantum Magnets to Magnetic Thermoelectrics: Short-Range Spin Correlations and the Secrets They Keep Short-range magnetic correlations have been increasingly recognized in recent years for their importance in contexts as widely varied as geometrically frustrated magnetism and functional magnetocaloric materials. Neutron scattering provides experimental access to these short-range correlations through magnetic diffuse scattering, but characterizing magnetic short-range order with quantitative accuracy has remained a difficult task. Event Location: https://ubc.zoom.us/j/66879995529?pwd=dHpQb25LSGVZK3ozY243em5tenRWQT09 Meeting ID: 668 7999 5529 Passcode: 113399

October

| Event Location: Connect via zoom | Speaker: Madeline Marshall (HAA/NRC)

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Studying the host galaxies of high-redshift quasars provides vital insights into the early growth of supermassive black holes and the black hole—galaxy connection. The launch of JWST will start a new era in this field, providing the opportunity to observe the stellar components of these host galaxies for the first time. Here I will present an analysis of the hosts of z=7 quasars in the BlueTides cosmological hydrodynamical simulation.

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Add to Calendar 2021-10-04T15:00:00 2021-10-04T16:00:00 Unveiling Stellar Light from the Host Galaxies of High-Redshift Quasars Studying the host galaxies of high-redshift quasars provides vital insights into the early growth of supermassive black holes and the black hole—galaxy connection. The launch of JWST will start a new era in this field, providing the opportunity to observe the stellar components of these host galaxies for the first time. Here I will present an analysis of the hosts of z=7 quasars in the BlueTides cosmological hydrodynamical simulation. Event Location: Connect via zoom

September

| Event Location: Various events at UBC and elsewhere |

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There will be no colloquium on the day of this national event to recognize and commemorate the legacy of residential schools.   See the following web-sites for information on what's happening at UBC:

https://irshdc.ubc.ca/orangeshirtday/

https://apsc.ubc.ca/orangeshirtday/

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Add to Calendar 2021-09-30T16:00:00 2021-09-30T17:00:00 No Colloquium - Truth & Reconciliation Day There will be no colloquium on the day of this national event to recognize and commemorate the legacy of residential schools.   See the following web-sites for information on what's happening at UBC: https://irshdc.ubc.ca/orangeshirtday/ https://apsc.ubc.ca/orangeshirtday/ Event Location: Various events at UBC and elsewhere

September

| Event Location: Connect via zoom | Speaker: Mehrnoosh Tahani (HAA)

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Magnetic fields pervade the interstellar medium and are important in the star-formation process. However, probing magnetic fields of star-forming regions is challenging. In this talk, I will discuss our research on the 3D morphology of magnetic fields in star-forming molecular clouds. We first developed a novel technique based on Faraday rotation measurements to determine the line-of-sight strength and direction of magnetic fields associated with molecular clouds. We applied our technique to four relatively nearby filamentary molecular clouds.

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Add to Calendar 2021-09-27T15:00:00 2021-09-27T16:00:00 Three-dimensional observations of interstellar magnetic fields Magnetic fields pervade the interstellar medium and are important in the star-formation process. However, probing magnetic fields of star-forming regions is challenging. In this talk, I will discuss our research on the 3D morphology of magnetic fields in star-forming molecular clouds. We first developed a novel technique based on Faraday rotation measurements to determine the line-of-sight strength and direction of magnetic fields associated with molecular clouds. We applied our technique to four relatively nearby filamentary molecular clouds. Event Location: Connect via zoom

September

| Event Location: Connect via zoom | Speaker: John Baez (UC Riverside)

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It came as a shock when I first realized that some of the most famous equations in thermodynamics are just the same as the most famous equations in classical mechanics - with only the names of the variables changed.  It turns out that this follows from a deep and not yet thoroughly studied analogy between the two subjects, which I will explain. 

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Add to Calendar 2021-09-23T16:00:00 2021-09-23T17:00:00 Classical Mechanics versus Thermodynamics It came as a shock when I first realized that some of the most famous equations in thermodynamics are just the same as the most famous equations in classical mechanics - with only the names of the variables changed.  It turns out that this follows from a deep and not yet thoroughly studied analogy between the two subjects, which I will explain.  Event Location: Connect via zoom

September

| Event Location: Zoom link in description | Speaker: Jason Alicea - Caltech

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Add to Calendar 2021-09-23T10:00:00 2021-09-23T11:00:00 Internally engineered Majorana modes in twisted bilayer graphene https://ubc.zoom.us/j/66879995529?pwd=dHpQb25LSGVZK3ozY243em5tenRWQT09 Meeting ID: 668 7999 5529 Passcode: 113399 Event Location: Zoom link in description

September

| Event Location: Connect via zoom | Speaker: Ruobing Dong (UVic)

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Planets form in gaseous protoplanetary disks surrounding newborn stars. As such, the most direct way to learn how they form from observations, is to observe them forming in disks. In the past, this was difficult due to a lack of observational capabilities, and planet formation was a subject of theoretical research.

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Add to Calendar 2021-09-20T15:00:00 2021-09-20T16:00:00 Observational Planet Formation Planets form in gaseous protoplanetary disks surrounding newborn stars. As such, the most direct way to learn how they form from observations, is to observe them forming in disks. In the past, this was difficult due to a lack of observational capabilities, and planet formation was a subject of theoretical research. Event Location: Connect via zoom

September

| Event Location: Hennings 201 (or via zoom) | Speaker: Faculty members

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Research group presentations:

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Add to Calendar 2021-09-16T16:00:00 2021-09-16T17:00:00 Overview of Physics & Astronomy Research Groups at UBC Research group presentations: Event Location: Hennings 201 (or via zoom)

September

| Event Location: Zoom link in description | Speaker: Prineha Narang, Harvard University

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Add to Calendar 2021-09-16T10:00:00 2021-09-16T11:00:00 CM Seminar: Controlling Emergent Behavior in Quantum Matter from a Theory Perspective https://ubc.zoom.us/j/66879995529?pwd=dHpQb25LSGVZK3ozY243em5tenRWQT09 Meeting ID: 668 7999 5529 Passcode: 113399 Event Location: Zoom link in description

September

| Event Location: Connect via zoom | Speaker: Aaron Boley (UBC)

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The rapid development of low Earth orbit (LEO) is being done without due regard for the long-term preservation of LEO or humanity's connection with the cosmos. In particular, large constellations of satellites, i.e., so-called mega-constellations or satcons, have the potential to severely interfere with the use and exploration of space by numerous other actors. This includes interference with astronomy and stargazing through light and spectrum pollution. Satcon development also might have non-trivial environmental impacts on Earth's atmosphere.

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Add to Calendar 2021-09-13T15:00:00 2021-09-13T16:00:00 Mega-Constellations and Astronomers: Updates on SATCON2 and IAU Dark and Quiet Skies The rapid development of low Earth orbit (LEO) is being done without due regard for the long-term preservation of LEO or humanity's connection with the cosmos. In particular, large constellations of satellites, i.e., so-called mega-constellations or satcons, have the potential to severely interfere with the use and exploration of space by numerous other actors. This includes interference with astronomy and stargazing through light and spectrum pollution. Satcon development also might have non-trivial environmental impacts on Earth's atmosphere. Event Location: Connect via zoom

September

| Event Location: online |

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The department will be hosting an Imagine Day session for undergraduate students. PHAS academic advisors will introduce PHAS undergrad programs and share tips for planning your academic schedule and seeking job/research opportunities. PHAS alumni will share experiences from student clubs. The event will end with a live Q&A session with PHAS advisors.

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Add to Calendar 2021-09-07T11:00:00 2021-09-07T11:45:00 PHAS Imagine Day Event 2021 The department will be hosting an Imagine Day session for undergraduate students. PHAS academic advisors will introduce PHAS undergrad programs and share tips for planning your academic schedule and seeking job/research opportunities. PHAS alumni will share experiences from student clubs. The event will end with a live Q&A session with PHAS advisors. Event Location: online

August

| Event Location: Connect via zoom | Speaker: Caleb Lammers + Justin Lawrence + Erik Gillis

Related Upcoming Events:

Caleb Lammers: "Candidate High-Redshift Protoclusters and Gravitationally Lensed Galaxies in the Planck High-z Catalogue"

Justin Lawrence: "Dark matter search limits and sensitivities with extragalactic dark matter components"

Erik Gillis: "An RRAT Census with CHIME/PULSAR"

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Add to Calendar 2021-08-30T15:00:00 2021-08-30T16:00:00 Even more student presentations Caleb Lammers: "Candidate High-Redshift Protoclusters and Gravitationally Lensed Galaxies in the Planck High-z Catalogue" Justin Lawrence: "Dark matter search limits and sensitivities with extragalactic dark matter components" Erik Gillis: "An RRAT Census with CHIME/PULSAR" Event Location: Connect via zoom

August

| Event Location: Connect via zoom | Speaker: Youtube

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It's the end of the summer, so let's have a completely informal meeting this week!

For the last colloquium slot before term starts, we'll have a discussion around some physics-related content from youtube and other video sources.  Some of our regular attendees have shared suggestions for amusing and/or informative bits of physics video, which we'll show.  If your favourite science clip isn't included, perhaps there will be time for additional examples at the end.

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Add to Calendar 2021-08-26T16:00:00 2021-08-26T17:00:00 Fun Fysics Films It's the end of the summer, so let's have a completely informal meeting this week! For the last colloquium slot before term starts, we'll have a discussion around some physics-related content from youtube and other video sources.  Some of our regular attendees have shared suggestions for amusing and/or informative bits of physics video, which we'll show.  If your favourite science clip isn't included, perhaps there will be time for additional examples at the end. Event Location: Connect via zoom

August

| Event Location: Connect via zoom | Speaker: Keshav Gopinath, Timothy Yu and Hao Tse Huang

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Keshav Gopinath: "MUSE Spectrograph and the analysis of a candidate group with a lensed quiescent galaxy"

Timothy Yu: "The Study of Molecular Gas Content of Massive Quiescent Galaxies at z~2"

Hao Tse (Howard) Huang: "Multi-tracer investigation of molecular gas in a massive radio galaxy"

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Add to Calendar 2021-08-23T15:00:00 2021-08-23T16:00:00 More student presentations Keshav Gopinath: "MUSE Spectrograph and the analysis of a candidate group with a lensed quiescent galaxy" Timothy Yu: "The Study of Molecular Gas Content of Massive Quiescent Galaxies at z~2" Hao Tse (Howard) Huang: "Multi-tracer investigation of molecular gas in a massive radio galaxy" Event Location: Connect via zoom
Echoes Made Simple
2021-08-19T16:00:00
2021-08-19T17:00:00

Echoes are common in many areas of physics, including NMR, plasma physics, nonlinear optics, cavity quantum electrodynamics, cold atoms physics, and dynamics of proton storage rings.  Recently, we theoretically found (probably) the simplest classical system featuring the echo phenomenon — a collection of randomly oriented free rotors with dispersed rotational velocities.

Event Location:
Connect via zoom
Speaker:
Ilya Sh. Averbukh (Weizmann Institute)
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August

| Event Location: Connect via zoom | Speaker: Dominic Walliman

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In this talk Dr Walliman shows how he uses graphics, illustration and animation to explain science on his popular YouTube channel Domain of Science. He explains his approach to science communication and his focus on context setting. For a case study he looks at the field of physics at three levels: the whole field, expanding in on quantum physics and finally looking at the fundamental particles of the standard model of particle physics.

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Add to Calendar 2021-08-12T16:00:00 2021-08-12T17:00:00 Explaining Science Visually Using Graphics and YouTube In this talk Dr Walliman shows how he uses graphics, illustration and animation to explain science on his popular YouTube channel Domain of Science. He explains his approach to science communication and his focus on context setting. For a case study he looks at the field of physics at three levels: the whole field, expanding in on quantum physics and finally looking at the fundamental particles of the standard model of particle physics. Event Location: Connect via zoom

August

| Event Location: Connect via zoom | Speaker: Suresh Sivanandam (UofT)

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Optical integral field (imaging) spectroscopic surveys of large numbers of galaxies are now becoming the norm. These surveys allow detailed studies of individual galaxies, which include their stellar/gas kinematics and stellar populations. With a sufficiently large sample, these types of observations are the best tools for understanding the formation and evolution of galaxies. However, similar surveys in the infrared remain challenging.

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Add to Calendar 2021-08-09T15:00:00 2021-08-09T16:00:00 Enabling Infrared Surveys of Galaxies with Innovative Imaging Spectrographs Optical integral field (imaging) spectroscopic surveys of large numbers of galaxies are now becoming the norm. These surveys allow detailed studies of individual galaxies, which include their stellar/gas kinematics and stellar populations. With a sufficiently large sample, these types of observations are the best tools for understanding the formation and evolution of galaxies. However, similar surveys in the infrared remain challenging. Event Location: Connect via zoom

August

| Event Location: Connect via zoom | Speaker: Richard Arnold (Victoria University of Wellington)

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If an object is symmetric, then there are numerous equivalent ways to describe its orientation in space.  For example, the lattice of a crystal with cubic symmetry can be mapped onto itself by 24 rotations.   The statistics of the orientations of such objects, even exercises as simple as finding the average orientation, are made complicated by these symmetries.

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Add to Calendar 2021-08-05T16:00:00 2021-08-05T17:00:00 Statistics of Ambiguous Rotations If an object is symmetric, then there are numerous equivalent ways to describe its orientation in space.  For example, the lattice of a crystal with cubic symmetry can be mapped onto itself by 24 rotations.   The statistics of the orientations of such objects, even exercises as simple as finding the average orientation, are made complicated by these symmetries. Event Location: Connect via zoom

July

| Event Location: Connect via zoom | Speaker: Chris Rodell (UBC EOAS)

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In late June 2021, the Pacific Northwest experienced extraordinarily high temperatures. British Columbia alone recorded over 60 record high temperatures, with the town of Lytton setting an all-time high temperature in Canada for three consecutive days, peaking at 49.6 C (121.3 F). During this talk, we will explore the meteorological conditions that led to these extreme temperatures—analyzing the upper air dynamics, mid-level thermal anomalies, and terrain effects during the event. We will also delve into the societal and environmental impacts regionally.

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Add to Calendar 2021-07-29T16:00:00 2021-07-29T17:00:00 Heatwave: A Synoptic Breakdown Of The Extraordinary Heatwave On The Pacific Coast Of The US And Canada in June 2021 In late June 2021, the Pacific Northwest experienced extraordinarily high temperatures. British Columbia alone recorded over 60 record high temperatures, with the town of Lytton setting an all-time high temperature in Canada for three consecutive days, peaking at 49.6 C (121.3 F). During this talk, we will explore the meteorological conditions that led to these extreme temperatures—analyzing the upper air dynamics, mid-level thermal anomalies, and terrain effects during the event. We will also delve into the societal and environmental impacts regionally. Event Location: Connect via zoom

July

| Event Location: Online | Speaker: Chiaki Kobayashi (University of Hertfordshire)

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Metallicities and elemental abundances are key to testing our current understanding of galaxy formation and evolution. At the beginning of the universe only light elements such as hydrogen and helium were produced. Carbon and heavier elements were instead created inside stars and distributed into the interstellar medium by stellar winds and supernova explosions. From the spatial distribution of elements in stars and gas, it is therefore possible to constrain the star formation and chemical enrichment histories of galaxies.

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Add to Calendar 2021-07-28T10:00:00 2021-07-28T11:00:00 Chemodynamical evolution of galaxies Metallicities and elemental abundances are key to testing our current understanding of galaxy formation and evolution. At the beginning of the universe only light elements such as hydrogen and helium were produced. Carbon and heavier elements were instead created inside stars and distributed into the interstellar medium by stellar winds and supernova explosions. From the spatial distribution of elements in stars and gas, it is therefore possible to constrain the star formation and chemical enrichment histories of galaxies. Event Location: Online

July

| Event Location: Connect via zoom | Speaker: Alysa Obertas (UofT)

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The Kepler telescope detected thousands of exoplanets in hundreds of multi-planet systems and revolutionised planetary sciences. Many of these systems are quite compact and are typically a few billions of years old. Consequently, we are seeing only a snapshot of system architectures after hundreds of billions or even trillions of orbits. A substantial portion of their evolution has been governed by dynamical interactions, however. This can allow us to probe their histories and constrain the role of the natal environment.

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Add to Calendar 2021-07-26T15:00:00 2021-07-26T16:00:00 The Dynamics of Compact, Multi-planet Systems The Kepler telescope detected thousands of exoplanets in hundreds of multi-planet systems and revolutionised planetary sciences. Many of these systems are quite compact and are typically a few billions of years old. Consequently, we are seeing only a snapshot of system architectures after hundreds of billions or even trillions of orbits. A substantial portion of their evolution has been governed by dynamical interactions, however. This can allow us to probe their histories and constrain the role of the natal environment. Event Location: Connect via zoom

July

| Event Location: Connect via zoom | Speaker: Philip Stamp (zoom)

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It has long been assumed that gravity and quantum mechanics can only be confronted at very high energies ~ 1.2 x 10^28 eV (enough to boil 5 tons of water, and 15 orders of magnitude above the range of particle accelerators). However, recent theory indicates that gravity may cause a breakdown of quantum mechanics at much lower energies, for large masses. This has led to a new experimental field in which such a breakdown is sought in earth-based labs.

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Add to Calendar 2021-07-22T16:00:00 2021-07-22T17:00:00 Quantum Gravity in the Lab It has long been assumed that gravity and quantum mechanics can only be confronted at very high energies ~ 1.2 x 10^28 eV (enough to boil 5 tons of water, and 15 orders of magnitude above the range of particle accelerators). However, recent theory indicates that gravity may cause a breakdown of quantum mechanics at much lower energies, for large masses. This has led to a new experimental field in which such a breakdown is sought in earth-based labs. Event Location: Connect via zoom

July

| Event Location: Online | Speaker: Sandro Tacchella (Harvard / UNIST)

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How and why galaxies grow in stellar mass and cease their star formation are key open questions of galaxy formation and evolution. I present evidence for a diversity of pathways for building up the quiescent galaxy population at early cosmic times. Specifically, I will present observational constraints on star-formation histories and quenching timescales by combining Keck DEIMOS spectroscopic data with >10-band photometry.

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Add to Calendar 2021-07-21T15:00:00 2021-07-21T16:00:00 Quenching massive galaxies How and why galaxies grow in stellar mass and cease their star formation are key open questions of galaxy formation and evolution. I present evidence for a diversity of pathways for building up the quiescent galaxy population at early cosmic times. Specifically, I will present observational constraints on star-formation histories and quenching timescales by combining Keck DEIMOS spectroscopic data with >10-band photometry. Event Location: Online

July

| Event Location: Connect via zoom | Speaker: Ilaria Caiazzo (Caltech)

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The advent of Gaia and of large photometric and spectroscopic surveys is changing the landscape of white dwarf studies. These incredible new data sets, together with improved models, have enabled tackling some unsolved mysteries concerning white dwarfs as a population, as well as discovering extremely peculiar objects that challenge our understanding of white dwarf formation and evolution.

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Add to Calendar 2021-07-19T15:00:00 2021-07-19T16:00:00 Small But Mighty: The Tiniest White Dwarf and Other Stories The advent of Gaia and of large photometric and spectroscopic surveys is changing the landscape of white dwarf studies. These incredible new data sets, together with improved models, have enabled tackling some unsolved mysteries concerning white dwarfs as a population, as well as discovering extremely peculiar objects that challenge our understanding of white dwarf formation and evolution. Event Location: Connect via zoom

July

| Event Location: Connect via zoom | Speaker: Wendy Freedman (U Chicago)

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An important and unresolved question in cosmology today is whether there is new physics that is missing from our current standard Lambda Cold Dark Matter (LCDM) model.

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Add to Calendar 2021-07-15T16:00:00 2021-07-15T17:00:00 Increasing Accuracy in the Hubble Constant: Consistency with LCDM An important and unresolved question in cosmology today is whether there is new physics that is missing from our current standard Lambda Cold Dark Matter (LCDM) model. Event Location: Connect via zoom

July

| Event Location: via ZOOM | Speaker: CAROLIN HOFER

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Abstract:
The Canadian Hydrogen Intensity Mapping Experiment (CHIME) is a drift-scan radio telescope designed to map large scale structure in the universe using the redshifted 21 cm line emitted by neutral hydrogen. By observing the 400 to 800 MHz frequency band, CHIME will measure the expansion rate of the universe in the redshift range z = 0.8 - 2.5 to constrain the nature of dark energy.

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Add to Calendar 2021-07-15T13:00:00 2021-07-15T15:00:00 Departmental Doctoral Oral Examination (Thesis Title: “The effects of calibration errors and foreground filters on the CHIME power spectrum measurement. A study with simulations and real data.”) Abstract: The Canadian Hydrogen Intensity Mapping Experiment (CHIME) is a drift-scan radio telescope designed to map large scale structure in the universe using the redshifted 21 cm line emitted by neutral hydrogen. By observing the 400 to 800 MHz frequency band, CHIME will measure the expansion rate of the universe in the redshift range z = 0.8 - 2.5 to constrain the nature of dark energy. Event Location: via ZOOM

July

| Event Location: Online | Speaker: Jenny Greene (Princeton University)

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Because they are dark-matter dominated, dwarf galaxies provide some of the most stringent tests of our cold dark matter model. Specifically, Lambda CDM makes predictions about the number, shape, and spatial distributions of the faint friends of massive galaxies. I will present results from the Exploration of Local VolumE Satellites (ELVES) survey, that constructs the largest sample of satellites around Milky Way-like hosts.

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Add to Calendar 2021-07-14T10:00:00 2021-07-14T11:00:00 Dwarf Galaxies and Their Black Holes Because they are dark-matter dominated, dwarf galaxies provide some of the most stringent tests of our cold dark matter model. Specifically, Lambda CDM makes predictions about the number, shape, and spatial distributions of the faint friends of massive galaxies. I will present results from the Exploration of Local VolumE Satellites (ELVES) survey, that constructs the largest sample of satellites around Milky Way-like hosts. Event Location: Online

July

| Event Location: via ZOOM | Speaker: JONATHAN MASSEY-ALLARD

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Abstract:

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Add to Calendar 2021-07-14T09:00:00 2021-07-14T11:00:00 Departmental Doctoral Oral Examination (Thesis Title: “Learning Physics with Interactive Simulations: Inductive Inquiry Learning Activities for an Introductory Electromagnetism Course”) Abstract: Event Location: via ZOOM

July

| Event Location: Connect via zoom | Speaker: Anna Sajina (Tufts)

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A key open question in extragalactic astronomy is understanding the processes driving the build-up and quenching of massive galaxies — specifically the role of AGN and environment therein.

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Add to Calendar 2021-07-12T15:00:00 2021-07-12T16:00:00 Galaxies, AGN and their environments A key open question in extragalactic astronomy is understanding the processes driving the build-up and quenching of massive galaxies — specifically the role of AGN and environment therein. Event Location: Connect via zoom

July

| Event Location: Virtual | Speaker: Dr. Renée Hložek

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The Equity & Inclusion in PHAS team presents “Impostor Syndrome,” a workshop run by astrophysicist Dr. Renée Hložek.

Navigating the academic environment can be stressful. Power dynamics can impact our ability to communicate clearly with each other, and can generate feelings of impostor syndrome. In this interactive workshop, we will use techniques of improvisation and changing power dynamics to explore ways we can shape our communication environment.

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Add to Calendar 2021-07-09T10:00:00 2021-07-09T12:00:00 Impostor Syndrome Workshop The Equity & Inclusion in PHAS team presents “Impostor Syndrome,” a workshop run by astrophysicist Dr. Renée Hložek. Navigating the academic environment can be stressful. Power dynamics can impact our ability to communicate clearly with each other, and can generate feelings of impostor syndrome. In this interactive workshop, we will use techniques of improvisation and changing power dynamics to explore ways we can shape our communication environment. Event Location: Virtual

July

| Event Location: Connect via zoom | Speaker: Richard Magin (UIC)

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Diffusion-weighted Magnetic Resonance Imaging (MRI) Depicts Regions of Sub- and Super-diffusion Encoded by the Fractional Diffusion Equation

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Add to Calendar 2021-07-08T16:00:00 2021-07-08T17:00:00 Fractional derivatives and applications in MRI Diffusion-weighted Magnetic Resonance Imaging (MRI) Depicts Regions of Sub- and Super-diffusion Encoded by the Fractional Diffusion Equation Event Location: Connect via zoom

July

| Event Location: Connect via Zoom | Speaker: Renata Kallosh (Stanford)

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We perform covariant quantization of Einstein gravity in spherical harmonic basis in the background of a Schwarzschild black hole. We use Regge-Wheeler gauge for modes with l>=2, and propose the gauge for l<2 modes.

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Add to Calendar 2021-07-07T11:00:00 2021-07-07T12:00:00 Quantization of Gravity in the Black Hole Background We perform covariant quantization of Einstein gravity in spherical harmonic basis in the background of a Schwarzschild black hole. We use Regge-Wheeler gauge for modes with l&gt;=2, and propose the gauge for l&lt;2 modes. Event Location: Connect via Zoom

July

| Event Location: Online | Speaker: Chiara Circosta (University College London)

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Feedback from active galactic nuclei (AGN) is thought to be key in shaping the life-cycle of host galaxies. AGN inject a significant amount of energy into the surrounding interstellar medium and launch gaseous winds. They are therefore able to potentially suppress or inhibit future star formation in their hosts. An ideal cosmic laboratory to study how AGN regulate galaxy growth is the so-called cosmic noon (z~2), i.e. the peak of AGN accretion activity when their energy output is overall maximized.

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Add to Calendar 2021-07-07T10:00:00 2021-07-07T11:00:00 Looking for observational signatures of feedback from active galactic nuclei Feedback from active galactic nuclei (AGN) is thought to be key in shaping the life-cycle of host galaxies. AGN inject a significant amount of energy into the surrounding interstellar medium and launch gaseous winds. They are therefore able to potentially suppress or inhibit future star formation in their hosts. An ideal cosmic laboratory to study how AGN regulate galaxy growth is the so-called cosmic noon (z~2), i.e. the peak of AGN accretion activity when their energy output is overall maximized. Event Location: Online

July

| Event Location: Connect via zoom | Speaker: Gioia Rau (GSFC)

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Multi-wavelength observations, from the ultraviolet (UV) to the infrared (IR) and beyond, are powerful tools for exploring evolved stars and characterizing exoplanets. Cool evolved stars contribute significantly to the interstellar medium (ISM) enrichment, via gas and dust produced in their atmospheres. Yet, a thorough understanding of their mass loss mechanism(s) remains challenging. Exploring cool evolved stars' upper layers is thus essential to unraveling their mass loss history and its influence on the composition of the ISM and Galactic ecology.

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Add to Calendar 2021-07-05T15:00:00 2021-07-05T16:00:00 Multi-wavelength Explorations of Evolved Stars and Exoplanets Multi-wavelength observations, from the ultraviolet (UV) to the infrared (IR) and beyond, are powerful tools for exploring evolved stars and characterizing exoplanets. Cool evolved stars contribute significantly to the interstellar medium (ISM) enrichment, via gas and dust produced in their atmospheres. Yet, a thorough understanding of their mass loss mechanism(s) remains challenging. Exploring cool evolved stars' upper layers is thus essential to unraveling their mass loss history and its influence on the composition of the ISM and Galactic ecology. Event Location: Connect via zoom

July

| Event Location: None | Speaker: None

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It's Canada Day and we're not having a Departmental Colloquium!

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Add to Calendar 2021-07-01T16:00:00 2021-07-01T17:00:00 Canada Day! It's Canada Day and we're not having a Departmental Colloquium! Event Location: None

June

| Event Location: Connect via Zoom | Speaker: Brittany Kamai (Caltech and UC Santa Cruz)

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We are living in an astrophysics transformation because decades ago technologists started to design and build our future.

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Add to Calendar 2021-06-30T11:00:00 2021-06-30T12:00:00 How do we design the future of gravitational wave astrophysics? We are living in an astrophysics transformation because decades ago technologists started to design and build our future. Event Location: Connect via Zoom

June

| Event Location: Online | Speaker: Nir Mandelker (KITP, UCSB)

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Massive star-forming galaxies and proto-clusters at high redshift, z>2, are thought to be fed by narrow streams of cold, ~10^4K, gas from cosmic web filaments. However, the interaction of these cold streams with the ambient hot CGM is poorly understood. In particular, the observational signatures of this interaction and of cold streams more broadly, the thermal and morphological state of the gas that eventually reaches the central galaxy, and its effect on galaxy evolution, are all open questions.

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Add to Calendar 2021-06-30T10:00:00 2021-06-30T11:00:00 The evolution of cold accretion flows in the CGM of massive galaxies and proto-clusters at z>2 Massive star-forming galaxies and proto-clusters at high redshift, z&gt;2, are thought to be fed by narrow streams of cold, ~10^4K, gas from cosmic web filaments. However, the interaction of these cold streams with the ambient hot CGM is poorly understood. In particular, the observational signatures of this interaction and of cold streams more broadly, the thermal and morphological state of the gas that eventually reaches the central galaxy, and its effect on galaxy evolution, are all open questions. Event Location: Online

June

| Event Location: Connect via zoom | Speaker: Adam Dong, Bradley Meyers and Ingrid Stairs

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The Canadian Hydrogen Intensity-Mapping Experiment (CHIME) opens a whole new window on the Universe and this new catalogue of more than 500 fast radio bursts (FRBs) provides a treasure trove of data for understaning FRBs. For the first time, we can study a population of FRBs from a single telescope. We see that they come from all over the sky and across the Universe, from very nearby galaxies to more than halfway back to the Big Bang. We also see that there may be more than one type of FRB.

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Add to Calendar 2021-06-28T15:00:00 2021-06-28T16:00:00 The first CHIME/FRB catalogue and beyond The Canadian Hydrogen Intensity-Mapping Experiment (CHIME) opens a whole new window on the Universe and this new catalogue of more than 500 fast radio bursts (FRBs) provides a treasure trove of data for understaning FRBs. For the first time, we can study a population of FRBs from a single telescope. We see that they come from all over the sky and across the Universe, from very nearby galaxies to more than halfway back to the Big Bang. We also see that there may be more than one type of FRB. Event Location: Connect via zoom

June

| Event Location: Connect via zoom | Speaker: Michael Zemcov (RIT)

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Observational astrophysics is often driven by the desire for ever increasing angular resolution, which has resulted in larger and more expensive telescopes with time. However, telescopes with very small apertures can sometimes perform cosmological measurements as important as their larger siblings. In this talk, I will present several examples of small aperture, space-based experiments providing unique views of the large scale structure of the Universe as traced at optical and infrared wavelengths.

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Add to Calendar 2021-06-24T16:00:00 2021-06-24T17:00:00 Measuring the Largest Structures in the Universe with the Smallest Telescopes in Space Observational astrophysics is often driven by the desire for ever increasing angular resolution, which has resulted in larger and more expensive telescopes with time. However, telescopes with very small apertures can sometimes perform cosmological measurements as important as their larger siblings. In this talk, I will present several examples of small aperture, space-based experiments providing unique views of the large scale structure of the Universe as traced at optical and infrared wavelengths. Event Location: Connect via zoom

June

| Event Location: Online | Speaker: Alice Shapley (UCLA)

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Add to Calendar 2021-06-23T10:00:00 2021-06-23T11:00:00 The Search for Ionizing Radiation at High Redshift /*--&gt;*/ /*--&gt;*/ Event Location: Online

June

| Event Location: Online | Speaker: Claudia Cicone (University of Oslo)

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The circumgalactic medium (CGM) represents the boundary between the interstellar medium and the cosmic web, and its properties are directly shaped by the baryon cycle in galaxies. The CGM was traditionally believed to consist mostly of warm and hot gas, but recent breakthroughs have presented a new scenario according to which an important fraction of its mass may reside in an "hidden" cold atomic and molecular phase.

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Add to Calendar 2021-06-18T10:00:00 2021-06-18T11:00:00 The hidden cold circumgalactic medium The circumgalactic medium (CGM) represents the boundary between the interstellar medium and the cosmic web, and its properties are directly shaped by the baryon cycle in galaxies. The CGM was traditionally believed to consist mostly of warm and hot gas, but recent breakthroughs have presented a new scenario according to which an important fraction of its mass may reside in an "hidden" cold atomic and molecular phase. Event Location: Online