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Lectures Calendar:

Fall 2021

Aug 30, 2021

Astronomy Seminar Series artwork

A Good Hard Look at Cosmic Supermassive Black-Hole Growth

11:30 am – 12:30 pm (CDT)Streaming Live

Speaker: Niel Brandt (Penn State University)Host: Jonelle Walsh

The 7 Ms Chandra X-ray Observatory exposure on the Chandra Deep Field-South (CDF-S) has provided the most sensitive extragalactic X-ray survey by a wide margin. About 1050 X-ray sources have been detected, primarily distant active galactic nuclei (AGNs) and starburst/normal galaxies. The unmatched deep multiwavelength coverage for these sources allows s... read more  »

Sep 2, 2021

Watch Video The Dynamic Local Universe

4:00 pm – 5:00 pm (CDT)Streaming Live

Speaker: Louis Strigari (Texas A&M University)Host: Casey Papovich

New three-dimensional measurements of the positions and velocities of stars, in particular from the Gaia observatory, have provided unprecedented information on the dynamics of the Milky Way and nearby dwarf galaxies. I will discuss how these observations have impacted our understanding of hierarchical structure formation in the Universe, the Milky Wa... read more  »

Sep 3, 2021

OPEN

4:00 pm – 5:00 pm (CDT)MIST M102

Speaker: TBA

Sep 6, 2021

Astronomy Seminar Series artwork

Roads Not Taken

11:30 am – 12:30 pm (CDT)Streaming Live

Speaker: Cameron Liang (Institute for Defense Analysis)Host: Stephanie Ho

I will discuss some highlights of research topics in my graduate school and postdoc experience. I will discuss my perspective and the technical skills I gained along the way. I will focus on my experience transitioning out of academia, and how my background helps transition into the world of data science and my current research role.      ... read more  »

Sep 8, 2021

How Bright is the Radio Sky? (We Don’t Know) (yet)

4:00 pm (CDT)Hawking Auditorium

Speaker: Jack Singal (University of Richmond)Host: Doojin Kim

The actual level of diffuse radio emission on our sky is surprisingly uncertain.  Almost all investigations that depend on understanding the radio sky, including cosmic microwave background and 21 cm cosmology foregrounds, rely on just one measurement – the 408 MHz Haslam map from the 1980s, which traces its absolute calibration to highly uncerta... read more  »

Sep 9, 2021

Watch Video Mining Neutron Stars

4:00 pm – 5:00 pm (CDT)Streaming Live

Speaker: Jeremy Holt (Texas A&M University)Host: Dan Melconian

Neutron stars are one of Nature’s most intriguing stellar objects, containing matter under extraordinary conditions of density, temperature, and composition that are difficult to produce in the laboratory. In recent years, neutron star observations have begun to place novel constraints on the properties of strongly interacting matter in the high-d... read more  »

Sep 10, 2021

OPEN

4:00 pm – 5:00 pm (CDT)MIST M102

Speaker: TBA

Sep 13, 2021

High Energy Theory artwork

Accelerating Solitons

3:00 pm – 4:00 pm (CDT)MIST M108

Speaker: Andrew Royston (Pennsylvania State University)Host: Falk Hassler

We show that the leading semiclassical behavior of soliton form factors at arbitrary momentum transfer is controlled by solutions to a new wave-like integro-differential equation that describes solitons undergoing acceleration. We work in the context of two-dimensional linear sigma models for concreteness, but our methods are purely semiclassical and ge... read more  »

Sep 13, 2021

Astronomy Seminar Series artwork

When Stars Go Nonlinear: Large Amplitude Tides and Stellar Oscillations

11:30 am – 12:30 pm (CDT)

Speaker: Nevin Weinberg (University of Texas, Arlington)Host: Jonelle Walsh

Tides significantly impact the structure, evolution, and fate of many types of close binary systems, including short-period exoplanets, stellar binaries, and coalescing binary neutron stars.  In many of these systems, the tide’s amplitude is so large that it cannot be treated as a small, linear perturbation to the background star.  In this talk, ... read more  »

Sep 16, 2021

Watch Video Matter under extreme conditions – Multi-disciplinary aspects of relativistic particle collisions

4:00 pm – 5:00 pm (CDT)Streaming Live

Speaker: Rene Bellwied (University of Houston)Host: Rainer Fries

Relativistic particle collisions have come a long way during the past two decades with the discovery of the Higgs Boson and the earliest state of matter in the evolution of the universe, the so-called Quark Gluon Plasma. I will try to show how these discoveries lead to significant multi-disciplinary efforts to understand the creation and evolution of ma... read more  »

Sep 17, 2021

Visualizing phase transitions in Weyl semimetal materials

4:00 pm – 5:00 pm (CDT)MPHY 213

Speaker: Inna M Vishik (University of California, Davis)Host: Ar. Abanov

Weyl semimetals are characterized by pairs of bulk Weyl nodes of opposite chirality, whose surface projections are connected by Fermi arcs. Many of these materials exhibit a high degree of tunability, which opens the possibility for driving topological phase transitions through various modalities. I will present our angle-resolved photoemission spectros... read more  »

Sep 20, 2021

High Energy Theory artwork

Linearized Supergeometry of 11D,N =1⁄8 Superspace

3:00 pm – 4:00 pm (CDT)MIST M108Streaming Live

Speaker: Anindya Sengupta (Texas A&M University)Host: Falk Hassler

In 1978, Cremmer, Julia, and Scherk wrote down a (component) theory of eleven-dimensional Supergravity. Soon, in 1980, Brink and Howe gave a superspace formulation of this theory. The component theory required that dynamical fields to be on-shell for the closure of 11D,N=1 Supersymmetry. The same on-shell requirement followed from the Bianchi identities... read more  »

Sep 20, 2021

Astronomy Seminar Series artwork

Prospects for Observing Exoplanets in the Coming Years with JWST

11:30 am – 12:30 pm (CDT)Hawking Auditorium

Speaker: Caroline Morley (University of Texas, Austin)Host: Stephanie Ho

As exoplanet astronomers, we currently stand at a threshold: with current and near-future discoveries from TESS, we have now discovered many of the nearby planets we share our neighborhood with. The Hubble and Spitzer space telescopes, as well as dedicated ground-based efforts, have provided a taste of the diversity of atmospheres these worlds have. The... read more  »

Sep 22, 2021

High Energy Phenomenology, Experiment, and Cosmology Seminar Series artwork

Black Holes in the Early Universe

4:00 pm – 5:00 pm (CDT)Hawking Auditorium

Speaker: Dan Hooper (University of Chicago)Host: Doojin Kim

Cosmology textbooks typically assume that the early universe was dominated by relativistic particles. But if even a relatively small number of black holes were created after inflation, they would make up an increasingly large fraction of the total energy density as space expands. I’ll argue that it is well-motivated to scenarios in which the early uni... read more  »

Sep 23, 2021

Watch Video Reasons to Remain Excited About WIMPs

4:00 pm – 5:00 pm (CDT)Streaming Live

Speaker: Dan Hooper (Fermilab and University of Chicago)Host: Louis Strigari

Although weakly interacting massive particles (WIMPs) have long been the leading class of candidates for the dark matter of our universe, the lack of a confirmed detection of these particles has left many in the scientific community increasingly skeptical of their existence. In this talk, I will ask the following questions: How surprised should we be th... read more  »

Sep 24, 2021

Control of Spin Waves by Spatially-Modulated Strain

4:00 pm – 5:00 pm (CDT)ZOOM link

Speaker: Ankang Liu (TAMU)Host: A. Finkelstein

We suggest to use spatially-modulated strain for control of a spin-wave propagating inside a bulk magnet. The modulation with the wave vector q=2k mixes spin waves with wave vectors near k and -k. This leads to lifting the degeneracy of the symmetric and antisymmetric eigenstate combinations of these waves. The resulting picture reminds the one for a tu... read more  »

Sep 27, 2021

High Energy Theory artwork

Worldsheet Correlators in AdS3

3:00 pm – 4:00 pm (CDT)Streaming Live

Speaker: Lorenz Eberhardt (Institute for Advanced Study)Host: Falk Hassler

We revisit the computation of string correlation functions in AdS3 with pure NS-NS flux from a worldsheet point of view. These correlators contain all the perturbative information about the spacetime CFT and the existence of winding strings in AdS3 makes them very rich. We propose a solution to the problem of computing these correlators. The winding cor... read more  »

Sep 29, 2021

High Energy Phenomenology, Experiment, and Cosmology Seminar Series artwork

Dark Matter Interactions in Condensed Matter Systems

4:00 pm – 5:00 pm (CDT)Streaming Live

Speaker: Yoni Kahn (University of Illinois at Urbana-Champaign)Host: Doojin Kim

Is your dark matter detector a bag of free particles? If you’re looking for GeV-TeV WIMPS, sure! If you’re looking for sub-GeV dark matter, emphatically no! I will argue that condensed matter physics is mandatory for understanding light dark matter interactions with generic solid-state detectors, and give three examples of simple models whic... read more  »

Sep 30, 2021

John Sarrao headshot

Watch Video Opportunities for Physicists at Los Alamos National Laboratory

4:00 pm – 5:00 pm (CDT)Streaming Live

Speaker: John Sarrao (Los Alamos National Laboratory)Host: Rupak Mahapatra

Los Alamos has long had collaborations with Texas A&M, and these interactions have accelerated significantly since 2018 when the Texas A&M University System joined the Triad team, the entity that oversees the Laboratory. Nevertheless, the National Labs in general, and Los Alamos in particular, are relatively unknown to many students (and faculty... read more  »

Oct 1, 2021

Millikan, Geim, Ashkin and COVID-19 aerosol

4:00 pm – 5:00 pm (CDT)MPHY 213

Speaker: Igor F. Lyuksyutov (TAMU)

We have modified Millikan and Geim experimental set-ups to trap and manipulate droplets that are the size of COVID-19 aerosol droplets, in a way similar to Ashkin optical tweezers. We plan to have a live demonstration of this experiment which will be done by two undergraduate students, Steven Szaal and Alexander Olah.

Oct 4, 2021

High Energy Theory artwork

The Tadpole Problem

3:00 pm – 4:00 pm (CDT)MIST M108

Speaker: Severin Lüst (Harvard University)Host: Falk Hassler

I will discuss string theory compactifications where a large number of moduli is stabilized by fluxes. I will present a conjecture which rules out the stabilization of all complex-structure moduli in F-theory at a generic point in moduli space by fluxes that satisfy the tadpole cancellation condition. Evidence for this conjecture comes from K3xK3 compac... read more  »

Oct 6, 2021

High Energy Phenomenology, Experiment, and Cosmology Seminar Series artwork

New Backgrounds and New Ideas for Sub-GeV Dark Matter Direct Detection

4:00 pm – 5:00 pm (CDT)Streaming Live

Speaker: Peizhi Du (Stony Brook University)Host: Doojin Kim

Probing sub-GeV dark matter requires designing low threshold detectors and understanding backgrounds. In this talk I will address these two issues. First, we point out several unexplored low-energy backgrounds in sub-GeV dark matter searches, which arise from high-energy particles of cosmic or radioactive origin that interact with detector materials. In... read more  »

Oct 8, 2021

OPEN

4:00 pm – 5:00 pm (CDT)MPHY 213

Speaker: TBA

Oct 11, 2021

High Energy Theory artwork

Quantum Minimal Surfaces from Quantum Error Correction

3:00 pm – 4:00 pm (CDT)MIST M108

Speaker: Geoff Penington (University of California, Berkeley & IAS)Host: Falk Hassler

We show that complementary state-specific reconstruction of logical (bulk) operators is equivalent to the existence of a quantum minimal surface prescription for physical (boundary) entropies. This significantly generalizes both sides of an equivalence previously shown by Harlow; in particular, we do not require the entanglement wedge to be the same for... read more  »

Oct 11, 2021

There and Back Again

11:30 am – 12:30 pm (CDT)

Speaker: Ryan Oelkers (Texas A&M University)Host: Jonelle Walsh

A considerable number of astronomers and physicists have begun pursuing careers in industry as the demand for data driven talent has increased. However, it can be difficult for early career scientists to navigate the industry job market or know what to expect in a post-academic career. In this seminar, I will summarize the technical aspects of my gradua... read more  »

Oct 13, 2021

High Energy Phenomenology, Experiment, and Cosmology Seminar Series artwork

Probing Axions with Event Horizon Telescope Polarimetric Measurements

4:00 pm – 5:00 pm (CDT)Hawking Auditorium

Speaker: Yue Zhao (The University of Utah)Host: Doojin Kim

With high spatial resolution, polarimetric imaging of supermassive black hole, like M87* or Sgr A*, by the Event Horizon Telescope can be used to probe the existence of ultralight bosonic particles, such as axions. Such particles can accumulate around a rotating black hole through the superradiance mechanism, forming an axion cloud. When linearly polari... read more  »

Oct 15, 2021

Localization and delocalization in kicked quantum matter

4:00 pm (CDT)MPHY 213

Speaker: David Weld (UCSB)Host: Ar. Abanov

A sizable fraction of the vast field of condensed matter physics consists of the exploration of the effects of spatial periodicity on quantum mechanics.  It is now widely recognized that the effects of temporal periodicity give rise to a related array of phenomena, and that the interplay of temporal and spatial periodicity with many-body interactio... read more  »

Oct 18, 2021

High Energy Theory artwork

T-duality and String Alpha’ Corrections

3:00 pm – 4:00 pm (CDT)MIST M108

Speaker: James Liu (University of Michigan)Host: Falk Hassler

Although T-duality is an inherently stringy symmetry, it can be seen at the effective field theory level, both in the classical two-derivative action and at the alpha’ corrected level.  In fact, T-duality invariance can be a powerful tool in constraining the form of the alpha’ corrections.  A particularly interesting framework involves a c... read more  »

Oct 20, 2021

High Energy Phenomenology, Experiment, and Cosmology Seminar Series artwork

Deciphering the Archaeological Record: Cosmological Imprints of Non-Minimal Dark Sectors

4:00 pm – 5:00 pm (CDT)Streaming Live

Speaker: Fei Huang (University of California, Irvine)Host: Doojin Kim

Non-trivial dynamics within the dark sector can give rise to a complicated, non-thermal dark-matter phase-space distribution, which in turn can significantly influence the growth of cosmic structure. In this talk, we explore the cosmological implications of the non-trivial dynamics which may arise within dark sectors containing many degrees of freedom... read more  »

Oct 21, 2021

Electronic Phase Changes in Topological Semimetals

4:00 pm – 5:00 pm (CDT)Hawking AuditoriumStreaming Live

Speaker: Joe Ross (Texas A&M University)Host: Wayne Saslow

Recently discover topological semimetals exhibit a wealth of interesting behavior due to the presence of massless Dirac and Weyl fermions, and the associated topologically-enforced interface and boundary states. Such states include the surface Fermi arcs identified in Weyl and Dirac systems, and “drumhead” surface states of more extended nodal-line ... read more  »

Spring 2022 & Beyond

Jan 21, 2022

OPEN

4:00 pm – 5:00 pm (CDT)MIST M102

Speaker: TBA

Jan 28, 2022

OPEN

4:00 pm – 5:00 pm (CDT)MIST M102

Speaker: TBA

Feb 4, 2022

OPEN

4:00 pm – 5:00 pm (CDT)MIST M102

Speaker: TBA

Feb 11, 2022

TBA

4:00 pm – 5:00 pm (CDT)MIST M102

Speaker: Gregory Falkovich (Weizmann)Host: A. Finkelstein

Feb 18, 2022

OPEN

4:00 pm – 5:00 pm (CDT)MIST M102

Speaker: TBA

Feb 25, 2022

TBA

4:00 pm – 5:00 pm (CDT)MIST M102

Speaker: Vedika Khemani (Stanford)

Mar 4, 2022

OPEN

4:00 pm – 5:00 pm (CDT)MIST M102

Speaker: TBA

Mar 11, 2022

OPEN

4:00 pm – 5:00 pm (CDT)MIST M102

Speaker: TBA

Mar 18, 2022

Spring Break

4:00 pm – 5:00 pm (CDT)MIST M102

Speaker: TBA

Mar 25, 2022

TBA

4:00 pm – 5:00 pm (CDT)MIST M102

Speaker: Hanyu Zhu (Rice University)Host: Ar. Abanov

Apr 1, 2022

Physics Festival

4:00 pm – 5:00 pm (CDT)MIST M102

Speaker: TBA

Apr 8, 2022

TBA

4:00 pm – 5:00 pm (CDT)MIST M102

Speaker: Eduardo da Silva Neto (Yale)Host: Ar. Abanov

Apr 15, 2022

Good Friday

4:00 pm – 5:00 pm (CDT)MIST M102

Speaker: TBA

Apr 22, 2022

TBA

4:00 pm – 5:00 pm (CDT)MIST M102

Speaker: Yi-Zhuang You (University of California, San Diego)Host: Ar. Abanov

Apr 29, 2022

OPEN

4:00 pm – 5:00 pm (CDT)MIST M102

Speaker: TBA