Events List for the Academic Year
Event Time:
Thursday, December 2, 2021 | 10:00 am - 11:00 am
Event Location:
Zoom
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2021-12-02T10:00:00
2021-12-02T11:00:00
Ben Breitung: Exploring High-Entropy Materials for Electrochemical Applications
Event Information:
https://ubc.zoom.us/j/66879995529?pwd=dHpQb25LSGVZK3ozY243em5tenRWQT09
Meeting ID: 668 7999 5529
Passcode: 113399
Title: Exploring High-Entropy Materials for Electrochemical Applications
Abstract: High-entropy ceramics are a novel materials class with rapidly increasing significance since their discovery in 2015. Their unique crystal structure and the enormous compositional freedom allows tailoring these compounds towards desired properties, thus enabling the development and optimization of new innovative materials for many existing applications.
This talk will give an overview about the general high-entropy concept and will describe the utilization of high-entropy ceramics for electrochemical applications. The fundamental impacts of high-entropy on material properties will be discussed, especially in the application areas of batteries and catalytic materials.
Event Location:
Zoom
Event Time:
Wednesday, December 1, 2021 | 5:30 pm - 7:30 pm
Event Location:
HENN201
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2021-12-01T17:30:00
2021-12-01T19:30:00
"Picture A Scientist" Movie Screening
Event Information:
The PHAS GSA (Grad Student Association) is partnering up with the Society of Graduate Students and Postdocs at TRIUMF (GAPS) and the PHAS E&I group to host a screening of the amazing film Picture A Scientist.
It has really taken the science world by storm after its release at the Tribecca Film Festival and is a must see for scientists. GAPS, GSA and E&I are hosting the screening on Wednesday, Dec 1st, 5.30pm @ HENN201 with FREE PIZZA afterward and would love to invite everyone in the department to come and join. Note that proof of vaccination will be checked for both the screening and the pizza afterwards. For those of us who can't make it to the screening, the film is now on Netflix.
Following the screening, the next PHAS Department Colloquium (Thursday, Dec 2nd, 4pm @ HENN 201 & Zoom) will be a panel discussion on Picture A Scientist. Currently, our panel consists of Jess McIver (UBC - gravitational waves), Allison Man (UBC - galaxy evolution), Aria Malhotra (UBC - radiation therapy), Janis McKenna (UBC - beyond standard model hadronic effects), and Beatrice Franke (TRIUMF,UBC - Ultra-cold neutron studies)! The colloquium will be held in person and on Zoom.
Event Location:
HENN201
Event Time:
Monday, November 29, 2021 | 3:00 pm - 4:00 pm
Event Location:
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2021-11-29T15:00:00
2021-11-29T16:00:00
Beyond slow-roll inflation
Event Information:
Cosmic inflation has become an integral part of our currently best-fitting cosmological model, called LCDM for its two major contributions to the energy content, which are a cosmological constant Lambda and cold dark matter. I will start out with a broad overview of cosmic inflation, its motivation for the Hot Big Bang picture and its most simple implementation in the form of a single scalar field that slowly rolls down its potential. I will show how that relates to the phenomenological implementation with 2 or 3 primordial parameters in our current standard LCDM model. Then ultimately I will go beyond the standard assumption of slow-roll initial conditions, which can lead to a finite amount of inflation, and which potentially could have observable effects on the power spectrum of the cosmic microwave background.
Event Location:
Connect via zoom
Event Time:
Thursday, November 25, 2021 | 4:00 pm - 5:00 pm
Event Location:
Hennings 201 or connect via zoom
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2021-11-25T16:00:00
2021-11-25T17:00:00
A window on TRIUMF
Event Information:
This talk will be an introduction to the science programme at TRIUMF, Canada's particle accelerator centre located on the South UBC campus, and to its new Director who is pleased to be working at a ground level laboratory with windows.
I will outline the various research areas that TRIUMF is currently engaged in both nationally and internationally, and the major new platforms that TRIUMF is developing. These are the ARIEL rare isotope facility, currently in construction and anticipated to be operational in 2026, and the IAMI medical isotope research platform, expected to be operational next year.
TRIUMF is also going through an exercise to develop a 20-year vision of possible future research directions. I will outline the progress in developing this vision, and possible new research areas that TRIUMF may explore. This is a time of change at TRIUMF as a new organisation, and I will outline some of the major changes and effects on the facility.
Event Location:
Hennings 201 or connect via zoom
Event Time:
Thursday, November 25, 2021 | 10:00 am - 11:00 am
Event Location:
Zoom
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2021-11-25T10:00:00
2021-11-25T11:00:00
Sinéad Griffin: Searching for New Matter
Event Information:
https://ubc.zoom.us/j/66879995529?pwd=dHpQb25LSGVZK3ozY243em5tenRWQT09
Meeting ID: 668 7999 5529
Passcode: 113399
Abstract:
The past decade has seen a huge surge of interest in matter that cannot be described by our standard theories such as Landau-Ginzburg theory or the Standard Model. For example, the theoretical proposal and subsequent experimental realization of topological phases in materials has ushered in a new era in the discovery of new forms of matter. On top of this, how these new phases of matter interact with our conventional order parameters such as superconducting, ferroelectricity, and magnetism, is an emerging area. In this talk, I will discuss how theory and ab initio calculations have driven the discovery of such novel forms of matter, with applications in classical and quantum computing. Finally, I will discuss how such emergent phenomena in quantum materials are apt for exploring matter that cannot be described by the Standard Model – dark matter – and how materials-by-design approaches can suggest new and enhanced detection experiments for low-mass dark matter detection.
Bio:
Sinéad Griffin is a staff scientist in the Materials Science Division and the Molecular Foundry at Berkeley Lab. Originally from Ireland, her work as a theorist focuses on the description and discovery of quantum materials and physical phenomena at the nanoscale. The applications of Sinéad's work range from new materials for energy and quantum computing to exploring the origins of the universe. Her awards include the Swiss Physical Society's General Prize, an MIT Rising Star in Physics, the Falling Walls Bay Area Young Innovator of the Year, and an 'Emerging Leader' from the Institute of Physics. Aside from her research, she is involved with building a research network in condensed matter physics in Africa, including being awarded an inaugural American Physical Society Innovation Fund grant to set up a US-Africa Workshop and Network.
Event Location:
Zoom
Event Time:
Monday, November 22, 2021 | 3:00 pm - 4:00 pm
Event Location:
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2021-11-22T15:00:00
2021-11-22T16:00:00
Dust, its composition, and evolution in the universe
Event Information:
Interstellar dust plays a crucial role in the formation of stars and the evolution and assembly of galaxies. Extinction provides an indirect measure of the enrichment process and conditions within an environment. Gamma-ray bursts (GRBs) are excellent probes for studying dust and metals in the distant universe, since they unveil the intergalactic medium along the line of sight and the interstellar medium surrounding the GRB event within its host galaxy. For the first time, we derive individual extinction curves of these cosmological sources, finding different forms from the typically used Small Magellanic Cloud type extinction curve. The shape of these extinction curves also provides clues to the dust's grain composition. Furthermore, looking for dust content in redshift z=0-8 GRBs, suggests a transition in dust properties and/or available dust building blocks. GRBs are providing us an outlook of metals and dust properties in the distant universe, through larger samples and exploitation of the potential of the data.
Event Location:
Connect via zoom
Event Time:
Thursday, November 18, 2021 | 4:00 pm - 5:00 pm
Event Location:
Hennings 201 (or via zoom)
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2021-11-18T16:00:00
2021-11-18T17:00:00
Teaching too many students with not enough resources
Event Information:
Like many departments with a large service teaching commitment, the Math Department has been operating for some time at the end of its logistical supply lines. In this talk I'll describe a mitigating initiative that grew out of an experimental small course structure at Vantage College, matured in a large first-year mainstream course, and will be used starting next year for all first-year calculus courses. We'll also discuss some other ways to address the challenge of doing good teaching at scale.
Event Location:
Hennings 201 (or via zoom)
Event Time:
Thursday, November 18, 2021 | 10:00 am - 11:00 am
Event Location:
Zoom
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2021-11-18T10:00:00
2021-11-18T11:00:00
Cory Dean: Towards realizing twistronics on demand
Event Information:
Passcode: 113399
Abstract: The ability to isolate atomically thin crystals, such as graphene, boron nitride, and the transition metal dichalcogenides, and then mechanically layer them to form new heterostructures has driven a recent revolution in materials design. These layered structures are held together by weak van der waals forces, rather than chemical bonding making it possible to readily mix and match 2D materials spanning a wide range of properties, virtually at will. More recently it has been demonstrated that the weak interlayer coupling also makes it possible to arbitrarily tune the rotation angle between adjacent layers and that varying this twist angle can lead to dramatic transformations in electronic, optical and magnetic of the combined heterostructure. Here I will discuss our ongoing efforts to develop in-situ control with the goal towards realizing dynamically tunable “twistronics”, where twisted devices can be reconfigured and probed in real-time. I will discuss recent progress in terms of mechanical rotation of individual monolayers, improved understanding of interfacial dissipation mechanisms, implementation of in-situ feedback of twist angle and new approaches towards developing non-contact control of the heterostructure geometry at the nanoscale. Prospects for realizing a tunable quantum simulator in a solid state platform will be discussed.
Event Location:
Zoom
Event Time:
Monday, November 15, 2021 | 3:00 pm - 4:00 pm
Event Location:
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2021-11-15T15:00:00
2021-11-15T16:00:00
A "Genetic" approach to constraining the assembly of the Milky Way
Event Information:
The galaxy population in the universe is immutably linked to its cosmology. The characteristics of galaxies are genetic traits which are set, in a large part, by the `DNA' defined by density fluctuations in the early universe, which govern the eventual mass assembly of galaxies. Large scale surveys in the Milky Way such as Gaia, APOGEE and GALAH, among others, have revealed new and intriguing `traits' of the Milky Way. One such example is the clear bi-modality in alpha-element abundances relative to Iron at fixed Iron abundance, which exhibits itself throughout the disc of the Galaxy. Many recent works have focused on understanding and characterising this feature, and have shown that it is likely one of the most important features of the Milky Way to be understood, if we are to fully characterise its formation and evolution. Here, I will propose that the [α/Fe] bimodality in the Milky Way may be directly connected to its history of mass assembly. I will demonstrate, using 'genetically modified' zoom-in cosmological simulations which vary the assembly history of a Milky Way-like galaxy whilst holding all other conditions fixed, that this is a good predictor of a galaxy's stellar population structure in the [α/Fe] plane. This has far-reaching implications for understanding the Milky Way and the physics that lead to its formation, but also provides a compelling motivation to search for and characterise this feature in the external galaxy population.
Event Location:
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Event Time:
Monday, November 8, 2021 | 3:00 pm - 4:00 pm
Event Location:
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2021-11-08T15:00:00
2021-11-08T16:00:00
Throwing DARTs at Asteroids
Event Information:
The Double Asteroid Redirection Test (DART) is NASA's first dedicated planetary defense mission. Set to launch later this month from Vandenberg Space Force Base, CA, USA, DART will demonstrate active asteroid deflection by altering the mutual orbit of the binary asteroid (65803) Didymos through a kinetic impact. Said kinetic impact is planned to happen in Fall 2022. Ejecta, rocks and gravel expelled at high velocity from the impact crater, will most likely be created during the collision of the spacecraft with its target. The aim of the DART experiment is to enable the scientific community to better understand the role that such ejecta play in altering an asteroid's orbit. In this talk, I will give an overview of the DART mission, and discuss how DART fits into current national and international planetary defense strategies.
Event Location:
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Event Time:
Thursday, November 4, 2021 | 4:00 pm - 5:00 pm
Event Location:
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2021-11-04T16:00:00
2021-11-04T17:00:00
Juggling Dynamics
Event Information:
Our work explores jugglers' dependence on muscle memory and dynamical prediction. If every throw is considered to be an independent event, there exist juggling patterns in which the reaction time required to make successive catches and the precision needed to make perfect throws exceeds human capabilities. Using simulations with Gaussian deviations applied to throw angles and velocities, we reinforce this claim and compare the stability of various juggling patterns known as siteswaps. We show that throw angles and velocities affect very distinct aspects of juggling performance, and we obtain criteria on each that are needed to avoid juggling failures.
Event Location:
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Event Time:
Thursday, November 4, 2021 | 10:00 am - 11:00 am
Event Location:
Zoom
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2021-11-04T10:00:00
2021-11-04T11:00:00
Abhay Pasupathy: Recent progress in moiré materials
Event Information:
https://ubc.zoom.us/j/66879995529?pwd=dHpQb25LSGVZK3ozY243em5tenRWQT09
Meeting ID: 668 7999 5529
Passcode: 113399
Abstract: I will discuss two recent sets of experiments from my group on moiré materials. In the first experiment, I will discuss transport experiments on twisted bilayers of the monolayer semiconductor WSe2 (Wang et al, Nature Materials 19, 861 (2020) and Ghiotto et al Nature 597, 345 (2021)). In these experiments, we see the presence of an insulating state at half filling of the lowest subband of this material driven by electron correlations. I will describe our recent efforts to understand transport properties of this material and the evidence that there exist a ring of quantum critical points in this system at the metal-insulator transitions driven by doping and electric field. Time permitting, I will then discuss scanning tunneling microscopy experiments on magic-angle twisted trilayer graphene where superconductivity has recently been observed. These imaging experiments show that the atomic and electronic structure of twisted trilayer graphene has a number of unique differences from its elder brother, twisted bilayer graphene. I will speculate on the importance of these differences for superconductivity in this material.
Bio: Abhay Pasupathy is a Professor of Physics at Columbia University (since 2009) and a group leader in the Condensed Matter Physics and Materials Science Department at Brookhaven National Laboratory (since 2019). His group uses scan probe microscopies and electron transport measurement to study emergent quantum phases in materials. Two-dimensional materials including exfoliated and thin-film grown materials are of particular interest.
Event Location:
Zoom
Event Time:
Monday, November 1, 2021 | 3:00 pm - 4:00 pm
Event Location:
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2021-11-01T15:00:00
2021-11-01T16:00:00
Observing the Aurora: a window into the near-geospace environment
Event Information:
The Northern Lights, also known the Aurora Borealis, are an ionospheric phenomena which has fascinated mankind for centuries. A beautiful display of light, the Aurora also provides a window into the workings of the near-space environment – most of which would otherwise remain invisible. The aurora yields important clues about plasma and large-scale dynamic processes in the solar-terrestrial environment. Due to the immense size of the near-earth environment, understanding how the Sun-Earth relationship evolves is a challenge. Fortunately, many of the same energetic processes that drive dynamics in near-Earth space are also projected on the upper atmosphere as optical emissions in the form of aurora and airglow. This talk will provide a broad overview of the aurora, its location and appearance, and how it can be used to gain insight into the manifestation of geospace processes powered by the solar wind-magnetospheric interaction. Additionally, a brief description on how the emergence of Citizen Science is prompting new advances in auroral research will be presented.
Event Location:
Connect via zoom
Event Time:
Thursday, October 28, 2021 | 4:00 pm - 5:00 pm
Event Location:
Hennings 201 (or via zoom)
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2021-10-28T16:00:00
2021-10-28T17:00:00
First detection of cosmological signal with CHIME
Event Information:
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.
In this talk I will introduce CHIME, a transit radio interferometer designed
specifically for this goal. I will discuss the promise and pitfalls of
Intensity Mapping and describe how we plan to confront the many challenges of
such observations, in particular removal of astrophysical foregrounds which are
six orders of magnitude larger than the 21cm signal.
Finally I will discuss our first intensity mapping science results: cross correlation
measurements against eBOSS spectroscopic catalogs. This is the first detection
of intensity mapping by an interferometer and the highest redshift measurements
of large scale structure by 21cm. We have significant detections of all three tracers:
LRGs, ELGs and quasars, and I will discuss the modelling and our interpretation
of the results.
Event Location:
Hennings 201 (or via zoom)
Event Time:
Thursday, October 28, 2021 | 10:00 am - 11:00 am
Event Location:
https://ubc.zoom.us/j/66879995529?pwd=dHpQb25LSGVZK3ozY243em5tenRWQT09
Meeting ID: 668 7999 5529
Passcode: 113399
Meeting ID: 668 7999 5529
Passcode: 113399
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2021-10-28T10:00:00
2021-10-28T11:00:00
Shanti Deemyad: Physics of Light Dense Matter: Quantum and Classical Effects in Dense lithium
Event Information:
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. Similar to hydrogen and helium even at zero temperature lattice of lithium remains far from static and a fascinating system to explore the lattice quantum effects in light dense matter.
In this talk I will review some of the major goals of research in high pressure physics in exploring the quantum effects in ultra-light dense matter and discuss how nuclear quantum effects affect the structural stability and superconductivity of lithium and other ultra-light materials. I will present our studies on exploring the signature of lattice quantum contributions to the structural phase transitions of lithium at low temperature, the effect of pressure on the evolution of Fermi surface of lithium and present our results on resolving the long-lasting mystery of lithium ground state.
Event Location:
https://ubc.zoom.us/j/66879995529?pwd=dHpQb25LSGVZK3ozY243em5tenRWQT09
Meeting ID: 668 7999 5529
Passcode: 113399
Event Time:
Monday, October 25, 2021 | 3:00 pm - 4:00 pm
Event Location:
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2021-10-25T15:00:00
2021-10-25T16:00:00
Relating the Diverse Merger Histories and Satellite Populations of Nearby Galaxies
Event Information:
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. To address this observational deficit and generate more useful comparison samples for models, I have contributed to a field-wide effort to survey the halos and satellites of nearby MW-mass systems. With observations from the Subaru Hyper Suprime-Cam, we are able to measure nearby galaxies' stellar halos to unprecedented depths and detect their complete satellite populations. Combined with insight from similar studies in the community, we have learned that (1) the stellar halos of MW-analogs are remarkably diverse, and (2) their satellite galaxy populations are equally diverse. The diversity in the halo properties of these galaxies appears to correspond directly to a diversity in their largest mergers. Leveraging this dual insight, we find that the diversity in these two components are connected: the number of dwarf satellites a MW-like galaxy hosts is tightly correlated with the mass of its largest merger. I will show empirically that indeed the MW and the nearby galaxy M81 evolve along this relation throughout their largest mergers. Unexpectedly, this relationship is not predicted by high-resolution galaxy formation models. The difference in the observed and predicted connection between two fundamental outcomes of hierarchical assembly represents an important gap in our understanding of galaxy formation in LCDM.
Event Location:
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Event Time:
Thursday, October 21, 2021 | 4:00 pm - 5:00 pm
Event Location:
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2021-10-21T16:00:00
2021-10-21T17:00:00
The Hubble tension and the early Universe
Event Information:
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
Event Time:
Thursday, October 21, 2021 | 10:00 am - 11:00 am
Event Location:
https://ubc.zoom.us/j/66879995529?pwd=dHpQb25LSGVZK3ozY243em5tenRWQT09
Meeting ID: 668 7999 5529
Passcode: 113399
Meeting ID: 668 7999 5529
Passcode: 113399
Add to Calendar
2021-10-21T10:00:00
2021-10-21T11:00:00
Vedika Khemani: Non-unitary dynamics via spacetime duality
Event Information:
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. I will present recent work [1] in which we show that a duality transformation between space and time on one hand, and unitarity and non-unitarity on the other, can be used to realize non-unitary evolutions whose steady states exhibit a rich variety of behavior in the scaling of their entanglement with subsystem size — from logarithmic to extensive to fractal. These fractally entangled states add a qualitatively new entry to the families of many-body quantum states that have been studied as energy eigenstates or dynamical steady states, whose entropy almost always displays either area-law, volume-law or logarithmic scaling. The range of steady-state entanglement scalings for the non-unitary evolution are closely related to the question of entanglement growth in time under different kinds of unitary dynamics, from localized to chaotic. This connection is sharpened by an exact mapping to unitary evolution with edge decoherence, in which information is irreversibly “radiated away” from one edge of the system. Finally, I will discuss how these ideas could be experimentally realized with present-day or near-term quantum technologies, and how spacetime duality allows us to mitigate (or eliminate altogether) the overhead from “postselection” of random measurement outcomes [2].
[1] Matteo Ippoliti, Tibor Rakovszky, Vedika Khemani, arxiv:2103.06873
[2] Matteo Ippoliti, Vedika Khemani, PRL 126, 060501 (2021)
Bio: Vedika Khemani is an assistant professor of physics at Stanford University. After completing her Ph.D. at Princeton University in 2016, she did her postdoctoral work as a Junior Fellow at Harvard. She is a recipient of an Alfred P. Sloan Fellowship, a DOE Early Career Award, the William L. McMillan Award, an APS George E. Valley Jr. Prize, the Breakthrough New Horizons in Physics Prize and the Packard Fellowship in Science and Engineering.
Event Location:
https://ubc.zoom.us/j/66879995529?pwd=dHpQb25LSGVZK3ozY243em5tenRWQT09
Meeting ID: 668 7999 5529
Passcode: 113399
Robust cosmological inference from galaxy clustering and weak lensing using cosmological simulations
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2021-10-18T15:00:00
2021-10-18T16:00:00
Robust cosmological inference from galaxy clustering and weak lensing using cosmological simulations
Event Information:
Cross-correlations between imaging and redshift surveys of galaxies and high-resolution observations of the CMB promise to shed light on the physical nature of dark matter and dark energy in the coming decade. One of the main factors limiting the precision and accuracy of cosmological constraints coming from these measurements will be our understanding of the physics of galaxy formation. In this talk, I will present a roadmap for leveraging cosmological simulations to provide highly flexible models for this physics, paving the way for robust cosmological inference. First, I will show how data-driven models of galaxy formation and evolution combined with contemporary machine learning techniques can be used as robustness tests for complex cross-correlation analyses, with case studies from the Dark Energy Survey and the Dark Energy Spectroscopic Instrument. I will then discuss recent progress on combining perturbative models of structure formation with N-body simulations in order to obtain robust predictions for galaxy clustering and weak lensing, and describe how similar models might be used to confront a variety of future observations.
Event Location:
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Event Time:
Thursday, October 14, 2021 | 4:00 pm - 5:00 pm
Event Location:
Hennings 201 or via zoom
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2021-10-14T16:00:00
2021-10-14T17:00:00
This year's Physics Nobel Prize
Event Information:
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
This short talk will describe the work leading to the Nobel award last week to Giorgio Parisi. I will focus on what is meant by "complexity",and on the "spin glass" system for which it was initially worked out, and on how these ides have then been applied to everything from economics and social behaviour to physics. Although the work is very technical, it can be described in simple language suitable for non-scientists, and that is what I will do.
Event Location:
Hennings 201 or via zoom