Events
October
| Event Location: HENN 202 | Speaker: Ramón Barthelemy (University of Utah)
Abstract:
Queer civil rights in the USA have been hard won from direct activism and organization of a diverse coalition of people, including trans women and men, People of Color, and members of the LGBT+ community more broadly.
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September
| Event Location: HENN 202 | Speaker: Suckjoon Jun (University of California, San Diego)
Abstract:
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September
| Event Location: HENN 318 | Speaker: Andy Zhao
Abstract:
Supersymmetric partition functions often have interesting geometric interpretations. For example, the partition function of the 2d A-model encodes the zero-pointed Gromov Witten invariants of the target space. Such interpretations sometimes allow us to derive new identities or test existing conjectures.
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September
| Event Location: Henn 318 | Speaker: Wyatt Reeves(PhD student)
Understanding quantum chaos in conformal field theories is extremely important. Chaotic dynamics can explain why so many systems can be studied with statistical mechanics, and why systems reach ``typical’’ states so quickly. Outside of the simplest, highly symmetric systems, all systems are expected to be described by chaotic dynamics; whether and how these dynamics can appear in theories with conformal symmetry is thus essential to further our understanding of most CFTs.
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September
| Event Location: Henn 318 | Speaker: Prof. Sergey Klimenko, University of Florida (remote)
TALK RECORDING AVAILABLE AT: https://drive.google.com/file/d/1OUNXpiVXfLfKK0drnOyUKkQzGZj6vtjc/view?usp=sharing
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September
| Event Location: HENN 202 | Speaker: Allanah Hallas, Cindy Shaheen, Chris Hearty, Valery Milner, Allison Man/Lucas Kuhn, Chloé Malbrunot/Doug Bryman, Andrew Potter and Steve Plotkin.
Introduction:
Our annual Research Jamboree is geared towards grad and undergrad students interested in research opportunities at PHAS. Faculty will briefly outline their research areas and student needs. Bring your questions!
Speaker list and abstracts:
1. Alannah Hallas: From structure to function in quantum materials
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September
| Event Location: Henn 318 | Speaker: Gray Reid(PhD Student)
In this thesis we present a series of studies in numerical relativity investigating stability, hyperbolicity and critical phenomena. The first part of our work is dedicated to the study of d-stars, hypothetical objects consisting of a boson star and global monopole minimally or nonminimally coupled to the general relativistic gravitational field. The space of solutions for these systems is large and, for a wide range of coupling parameters, exhibits ground state solutions with asymptotic shells of bosonic matter.
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September
| Event Location: HENN 202 | Speaker: Dr. Ingrid Stairs (University of British Columbia)
About:
Precision timing of an array of millisecond radio pulsars spread across the sky can be used to look for low-frequency gravitational waves. In June 2023, the North American Nanohertz Observatory for Gravitational Waves (NANOGrav), along with other pulsar timing array collaborations, released evidence for such gravitational waves, likely in the form of a stochastic background due to supermassive black hole binaries in the universe. I will review the NANOGrav observational and detection methods, and discuss the implications of our find.
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September
| Event Location: Hennings 318 | Speaker: Vincent (Hong Zhe) Chen
Abstract:
While entanglement has been examined extensively in AdS/CFT, it has avoided significant attention in the study of celestial holography and asymptotic symmetries relevant to asymptotically flat spacetime.
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September
| Event Location: HENN 318 | Speaker: Dr. Anna Ordog (UBC-O and Dominion Radio Astrophysical Observatory, https://astroherzberg.org/people/anna-ordog/)
About:
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September
| Event Location: HENN 318 | Speaker: Prof. Prajval Shastri (Raman Research Institute, India and International Centre for Radio Astronomy Research, Australia, https://prajvalshastri.wordpress.com)
About this Galaxy Seminar:
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September
| Event Location: Henn 318 | Speaker: Dr. Paolo Cremonese, Universitat de las Illes Balears
Abstract:
In this talk, I will give a brief introduction on the lensing of gravitational waves, with special attention to the wave optics regime. After the introduction, I will present a method that makes use of the phase of the signal to identify and properly categorize lensed merging binaries events. Finally, I will address a well-known problem in gravitational lensing, the Mass-Sheet Degeneracy and I will show how this could affect parameter estimation for lensed events.
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August
| Event Location: HENN 318 | Speaker: Ben Scully, PHAS summer undergraduate intern
ASTRO Colloquia for Summer 2023
* Summer undergraduate student talk will be ~20-30 minutes including Q&A
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August
| Event Location: HENN 318 | Speaker: Martes Wong, PHAS summer undergraduate intern; Mercedes Thompson PHAS MSc. student
Martes will be speaking on: "Looking into the void: Spectral Analysis of Intracluster Light using MUSE"
Mercedes will be speaking on: "Breaking the Third Dimension: Outflow Proprieties of a Triply Lensed Quiescent Galaxy at z ~ 1.6"
* Summer undergraduate student talks will be ~20-30 minutes including Q&A
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August
| Event Location: Henn 318 | Speaker: Conor Waterfield(MSc student)
Abstract: Stochastic gravity opens up the ability to study problems where quantum fluctuations are important in semiclassical gravity. Many of these problems require regularization techniques which may break certain symmetries. In this thesis, the effects of fluctuating spacetime on geodesics is studied in the framework of interacting quantum field theories and in studying geodesic deviation. The possibility of using Pauli-Villars to regularize quantum fields in stochastic gravity calculations is explored.
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July
| Event Location: HENN 318 | Speaker: Vaidehi Gupta, PHAS summer undergraduate intern; Harshini Paranjape, PHAS summer undergraduate intern
Vaidehi will be speaking on: "Identification of Protocluster memebers near SDP17"
Harshini will be speaking on: "Updating the LIGO auxiliary channel list with the noise score"
* Summer undergraduate student talks will be ~20-30 minutes including Q&A
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July
| Event Location: https://ubc.zoom.us/j/67853605007?pwd=Y0JrQkZJdlFvb0NRc29PcWVBdWsvdz09 | Speaker: Eleni (Marilena) Lykiardopoulou (PhD student)
Experimental investigations of nuclear structure provide a probe to study the strong nuclear force, many properties of which still remain unknown. One powerful way to experimentally investigate nuclear structure is through the mass of the atomic nucleus, as it reveals the binding energy of the nucleus.
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July
| Event Location: HENN 318 | Speaker: James Burgoyne, PHAS M.Sc. student
James Burgoyne will be speaking on: "Unveiling the transient evolution of a galaxy through a hyper-luminous quasar, Q2343+125 at z=2.577"
* Each graduating MSc student talk will be 30 minutes including Q&A
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July
| Event Location: Hennings Building - Room 318 | Speaker: Bill Unruh
Since Bohr set out his interpretation of Quantum Mechanics which
separated small quantum systems from classical measuring systems, the question
as to whether or not there was a physical division between the quantum and the
classical. Is there some criterion which divides the world into quantum bits
and classical bits? Experiments are not answering the question. In particular
I will argue that the 40Kg mirrors of Ligo have already been shown to be
quantum by showing that that the quantum noise of Ligo arises from an
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July
| Event Location: HENN 318 | Speaker: Dhatri Raghunathan, PHAS summer undergraduate intern
Astro Colloquia for Summer 2023
* Summer undergraduate student talk will be ~20-30 minutes including Q&A
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July
| Event Location: https://ubc.zoom.us/j/66513543864?pwd=RXVQSFRFNTZINmMrZ3RJUXhHNHJXQT09 | Speaker: Luke Reynolds (PhD student)
MRI-based assessments of the human brain are critical for research, diagnosis and treatment of neurological disorders. Future clinical practice will demand accurate and consistent quantitative methodology alongside today’s qualitative image evaluations. Consequently, MRI research focuses on developing physical understanding of prevalent techniques and establishing new methods for efficient quantitative analysis. The brain’s complex structure complicates this goal.
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July
| Event Location: HENN Rooms 200 and 201 | Speaker: Fredrik Höök (Department of Physics, Chalmers University of Technology in Sweden)
Frontiers in Biophysics (FiB) 2023 is an annual one-day conference in the Pacific Northwest covering all areas of quantitative biology and biophysics. FiB is a unique environment that brings together a wide variety of scientific disciplines and individuals from all experience levels to learn, present, and discuss biophysics research for the day, followed by a social event in the evening!
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June
| Event Location: HENN 318 | Speaker: Ryan Jackim (Master's student)
Abstract:
Abstract: We present a catalogue of white dwarf candidates constructed from the GALEX and Gaia EDR3 catalogues.
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June
| Event Location: Hennings 318 | Speaker: Shawn Hsueh(PhD student)
My research aims to advance the development pipeline of protein and peptide therapeutics from a biophysical perspective, and covers a spectrum of contributions from methodologies to applications. For methodology contributions, I have developed an unbiased molecular dynamics (MD) simulation tool, Reservoir REMD, and integrated it into GROMACS. It has been benchmarked and shown to give the same results for different initial conformations, even when starting the simulation from a kinetically trapped initial state.
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June
| Event Location: Henn 318 | Speaker: Prof. Yanbei Chen, Caltech (remote)
TALK RECORDING AVAILABLE AT: https://drive.google.com/file/d/1VU0khsZv5zqt4ZX04xZCkKzTpluNTdwg/view?usp=sharing
Abstract:
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June
| Event Location: https://ubc.zoom.us/j/61540621166?pwd=UGZDVkpiUTVmdEY5Qmtva2REVzVrQT09 | Speaker: Stepan Fomichev(PhD student)
Motivated by the success of the momentum average (MA) approximation for the single-polaron and bipolaron cases, in this thesis we pursue the first generalization of this technique to the case of weakly-doped insulators beyond the Migdal limit. In search of a suitable starting point, we investigate the ground states of a variety of model Hamiltonians, inspired by real materials such as the rare-earth nickelates, polyacetylene, barium bismuthates, and buckminsterfullerene.
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June
| Event Location: HENN 302 | Speaker: Paul Ripoche (PhD student)
Abstract:
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June
| Event Location: HENN 302 | Speaker: Tristan Pinsonneault-Marotte (PhD student)
Abstract:
The Canadian Hydrogen Intensity Mapping Experiment (CHIME) is a radio telescope that we built to map the large-scale structure of the Universe between redshifts $0.8<z<2.5$, when dark energy is expected to begin the transition from a decelerating to an accelerating phase in its expansion. It was designed to perform an intensity mapping survey using the 21 cm line of neutral hydrogen, a novel method that has the potential to enable enormous surveys of the distant Universe, but also significant observational challenges to overcome.
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May
| Event Location: https://ubc.zoom.us/j/68991164698?pwd=dzFGNVdPbSt4QldsVHNlWnJLL2ZWQT09 Passcode: 815209 | Speaker: Chris Waddell(PhD student)
Abstract: The AdS/CFT correspondence is a far-reaching equivalence between theories of quantum gravity in spacetimes with negative cosmological constant, such as anti-de Sitter (AdS) space, and lower-dimensional, non-gravitational quantum systems, such as conformal field theories (CFTs).
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May
| Event Location: https://ubc.zoom.us/j/62625300003?pwd=RTBNckgzbDk0aXhRR3NyUUEyaGV4UT09 | Speaker: Andrew Jacobs(PhD student)
Abstract: Since the 1960's a general understanding of the creation of the chemical elements in the universe has existed. However, in recent decades this understanding has undergone refinement in describing the exact astrophysical mechanisms which result in the synthesis of isotopes, particularly those heavier (i.e. more protons) than iron.
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May
| Event Location: Centre for Brain Health room 3402A or https://ubc.zoom.us/j/63777759360?pwd=SmFXcG84UWFJc3c0Z2Q4d2NMVHNCQT09 Passcode: 921391 | Speaker: Connor Bevington(PhD student)
Hybrid PET/MRI scanners are becoming more common in research and clinical settings, in particular for their ability to simultaneously acquire unique functional and structural information to probe the healthy and diseased brain. Data from both modalities need to be thoroughly processed to enhance signal-to-noise ratios (SNR), and the development and optimization of analysis algorithms is required to extract meaningful physiological quantities for medical research applications.
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April
| Event Location: Henn 318 | Speaker: Prof. Shinji Mukohyama, Yukawa Institute for Theoretical Physics, Kyoto University
TALK RECORDING AVAILABLE AT: https://drive.google.com/file/d/1rCjcB4RkIckHq3anhXzzsKDS8QRsNW4n/view?usp=share_link
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April
| Event Location: HEBB Building, Room 116 | Speaker: Dr. Simon Viel (Carleton University)
Abstract:
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April
| Event Location: HENN 201 | Speaker: Raymond Brock (Michigan State University)
Abstract:
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April
| Event Location: AMPL 311 | Speaker: Erik Sorensen (McMaster University)
Abstract: The bond-dependent Ising interaction present in the Kitaev model has recently attracted considerable attention. The attention has mostly focused on the two-dimensional honeycomb lattice version of the Kitaev model where several materials has been identified as potential realizations. However, one can also imagine realizing simpler one-dimensional Kitaev spin chains that still has a surprisingly rich structure.
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April
| Event Location: https://ubc.zoom.us/j/62482228932?pwd=a3RIU0xFY0wrSFYrYzNFbzc2ZXZ0dz09 Passcode: 199086 | Speaker: PhD student: Maryam Rostamzadeh
Liver cancer is the sixth most common cancer worldwide and radiation therapy has been a non-surgical alternative for treating patients with advanced liver cancer. Dynamic tumor tracking (DTT) has been developed to treat intra-fractionally moving liver tumors with radiation therapy. However, one of the most challenging aspects of DTT is detecting the internal tumor position, which usually relies on implanted markers as a surrogate for tumor position.
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April
| Event Location: HENN 201 | Speaker: Shohini Ghose (Wilfrid Laurier)
Abstract:
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April
| Event Location: AMPL 311 or watch online | Speaker: Leslie M. Schoop – Princeton University
Abstract: Quantum materials are hoped to change technology in various aspects. However, most of the desired applications are hindered by the lack of suitable materials. In my group we are using concepts from chemistry to understand, predict and synthesize new quantum materials. In this talk, I will show how simple concepts, such as measuring bond distances, allow us to make predictions about electronic structures of materials, which we can then use to find new quantum materials.
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April
| Event Location: HENN 318 | Speaker: Dr. Hyoyin Gan (UBC Physics & Astronomy)
Abstract:
The detection of the 21 cm signal from the Epoch of Reionisation (EoR) is challenging due to the strong astrophysical foregrounds, radio frequency interference (RFI), and ionospheric and instrumental effects. Most if not all observations of the 21 cm signal at high redshifts show so-called “excess variance” in their power spectrum, well beyond what would be expected based on the thermal noise limit. Understanding the sources of the excess is crucial for improving upper limits on the EoR signal.
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March
| Event Location: HENN 201 | Speaker: Dr. Mattia Bacca (UBC, MechEng)
Abstract:
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March
| Event Location: AMPL 311 | Speaker: Adina Luican-Mayer (University of Ottawa)
Abstract: Material systems, devices, and circuits, based on the manipulation of individual charges, spins, and photons in solid-state platforms are key for quantum technologies. The burgeoning field of quantum two-dimensional (2D) materials presents an emerging opportunity for the development of next-generation quantum technologies, while also pushing the boundaries of fundamental understanding in condensed matter.
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March
| Event Location: HENN 318 | Speaker: Dr. Tarraneh Eftekhari (Northwestern University)
Abstract:
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March
| Event Location: HENN 201 | Speaker: Marcos (Danny) Caballero (Department of Physics and Astronomy; Department of Computational Mathematics, Sciences, and Engineering; and CREATE for STEM Institute, Michigan State University; Department of Physics and Center for Computing in Science Education, University of Oslo)
Abstract:
Computing has revolutionized how modern science is done. Modern scientists use computational techniques to reduce mountains of data, to simulate impossible experiments, and to develop intuition about the behavior of complex systems. Much of the research completed by modern scientists would be impossible without the use of computing. And yet, while computing is a crucial tool of practicing scientists, most modern science curricula do not reflect its importance and utility.
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March
| Event Location: AMPL 311 or watch online | Speaker: Xie Chen (California Institute of Technology)
Abstract: Fracton order describes the peculiar phenomena that point excitations in certain strongly interacting systems either cannot move at all or can only move in a lower dimensional sub-manifold. It has recently been discovered in various lattice models, tensor gauge theories, etc. In this talk, we discuss how another powerful field theory framework -- the 2+1D Chern-Simons (CS) gauge theory -- can be used to provide new insight and explore new possibilities in 3+1D fracton order.
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March
| Event Location: Hennings 318 | Speaker: Yukun Huang(PhD student)
Over the past two decades, our knowledge of the Solar System's transneptunian region (often called the Kuiper Belt) has been gradually increasing. Observational surveys have greatly expand the inventory of TNOs, which are distant icy bodies thought to be relics from the giant planet formation and migration era. As more intricate details are unveiled in the TNO orbital and physical properties, several aspects are thought to be tightly linked to the Solar System's early formation.
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March
| Event Location: HENN 318 | Speaker: Dr. Kim-Vy Tran (School of Physics, University of New South Wales)
Abstract:
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March
| Event Location: HENN 201 | Speaker: Paul François (Université de Montréal)
Abstract:
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March
| Event Location: HENN 318 | Speaker: Sven Bachmann, UBC Mathematics
Abstract:
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March
| Event Location: HENN 318 | Speaker: Dr. Eileen Otte (Stanford University)
Abstract:
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March
| Event Location: AMPL 311 | Speaker: Frédéric Grillot (Télécom Paris/ University of New-Mexico)
Abstract: Semiconductor nanostructures with low dimensionality like quantum dots are one the best attractive solutions for achieving high performance photonic devices. When one or more spatial dimensions of the nanocrystal approach the de Broglie wavelength, nanoscale size effects create a spatial quantization of carriers along with various other phenomena based on quantum mechanics.
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