Events Archive

Dark Cosmos - Enhancing the early universe from rotating axion field|Dr Nicolas Fernandez|April 11 @4PM
Tue, Apr 11, 2023, 4:00 pm5:30 pm

In this talk, I present a novel scenario in which the unexplored cosmological evolution of the axion field, specifically a rotation in field space, gives rise to the observed dark matter abundance, baryon asymmetry of the Universe, and gravitational waves signatures. This rotation of the axion field provides a natural origin for an era of…

Physic faculty, post docs, grads
Condensed Matter: The Art and Science of Molecular Beam Epitaxy ——From Topological Materials to Interfacial Superconductivity |Cui-Zu Chang, The Penn State Univ |JH Rm @12pm
Tue, Apr 11, 2023, 12:00 pm1:30 pm

Molecular beam epitaxy (MBE) is an epitaxial process by which we could grow single-crystal thin films, heterostructures, and superlattices with the highest achievable purity. Therefore, MBE is known as one of the most advanced and controllable material synthesis methods. In this talk, I will briefly introduce the MBE growth mechanism and then…

Faculty, post docs, grads
IAS HET Seminar | Clay Cordova, University of Chicago| “Higher Symmetry in Particle Physics” | Bloomberg Lecture Hall & Zoom
Mon, Apr 10, 2023, 2:30 pm3:30 pm

Higher symmetries in quantum field theory are novel concepts of symmetry that involve extended operators such as Wilson lines in gauge theory. We briefly review this formalism and then discuss recent applications to particle physics, including an organizing principle for unification models and models of axions. …

PGI Seminar Series Spring 2023|Mariafelicia De Laurentis|University of Naples|"Testing Gravity at Galactic Center"
Mon, Apr 10, 2023, 12:30 pm1:30 pm

The Galactic Center of the Milky Way, thanks to its proximity, allows to perform astronomical observations that investigate physical phenomena at the edge of astrophysics and fundamental physics. As such, it offers a unique laboratory to probe gravity, where one can not only test the basic predictions of General Relativity but is also able…

IAS HET Seminar | Nathan Seiberg, Charles Simonyi Professor, School of Natural Sciences, IAS| “Symmetries and Anomalies in the Continuum and on the Lattice” | Bloomberg Lecture Hall & Zoom
Fri, Apr 7, 2023, 1:45 pm1:45 pm

Based on joint work with Meng Cheng (arXiv:2211.12543), we will discuss some aspects of global symmetries and their ‘t Hooft anomalies.

We will define a notion of an emanant global symmetry. It is not a symmetry of the UV theory, but unlike emergent (accidental) symmetries, it is not violated by any…

Hamilton Colloquium Series, Shirley Ho, "Deep learning as a last resort "
Thu, Apr 6, 2023, 4:00 pm5:00 pm

For the last 10 years, we have seen a rapid adoption of deep learning techniques across many disciplines, ranging from self-driving vehicles, credit card rating to biomedicine. Along with this wave, we have seen rapid adoption and rejection in the nascent field of Machine Learning and…

A free lecture open to the public.
PGI Seminar Series Spring 2023|Josu Aurrekoetxea|Oxford|"Fundamental Physics from the Strong-Field Regime of Gravity"
Thu, Apr 6, 2023, 12:30 pm1:30 pm

We are in a new era of gravitational physics in which both gravitational-wave measurements and cosmological observations can be used to test fundamental physics. Moreover, recent computational developments allow us to investigate (at present largely unexplored) regimes where the gravitational force is strong – a very promising area to search…

Condensed Matter: Quantum Many - Body topology beyond pure states |Meng Cheng, Yale|April 4 @12PM Joseph Henry Rm
Tue, Apr 4, 2023, 12:00 pm1:00 pm

It is by now well-understood that gapped ground states of local Hamiltonians can be classified topologically, and the nontrivial states exhibit a variety of interesting topological phenomena. In this talk I’ll discuss how the topological classification can be generalized to disordered ensembles and mixed states. I’ll focus on short-range…

Physics faculty, post docs, grads
HET Seminar |Scott Collier, Princeton University| “3d gravity and Teichmuller TQFT” | PCTS & Zoom
Mon, Apr 3, 2023, 2:30 pm2:30 pm

I will describe a proposal that relates AdS_3 quantum gravity to a topological quantum field theory known as ``Teichmuller TQFT.’’ This proposal clarifies the relationship between pure AdS_3 quantum gravity and two copies of SL(2,R) Chern-Simons theory and resolves some well-known issues with this lore. I will argue…

PGI Seminar Series Spring 2023|Federico Pasqualotto|UC Berkeley|"The Interaction of Gravitational Waves from Localized and Distant Sources""
Mon, Apr 3, 2023, 12:30 pm1:30 pm

This talk will concern the interaction problem in General Relativity in a specific setting. More precisely, we will describe a research program aimed at a rigorous understanding of the interaction of gravitational waves originating from several localized and distant sources.
First, we will restrict our attention to a model problem …

PGI Seminar Series Spring 2024 |Roman Berens |Vanderbilt University| "TBA"
Sat, Apr 1, 2023, 12:30 pm1:30 pm

Abstract: TBA

PGI Seminar Series Spring 2024 |Roman Berens |Vanderbilt University| "TBA"
Sat, Apr 1, 2023, 12:30 pm1:30 pm

Abstract: TBA

Special Seminar: Dark matter properties and detection: an AMO physics approach |Jesus Perez-Rios, Stonybrook|JH Rm @4PM
Fri, Mar 31, 2023, 2:30 pm3:30 pm

This talk will present our research on dark matter properties and dark matter search based on theoretical atomic, molecular, and optical (AMO) physics tools. We apply AMO physics’ theoretical tools to high-energy physics and cosmology scenarios. To illustrate our approach, first, we will present our work toward molecular excitations as light…

Faculty, Postdocs, graduate students
HET Seminar |Grant Remmen, KITP, UC Santa Barbara| “Stringy Dynamics from an Amplitudes Bootstrap” | PCTS & Zoom
Fri, Mar 31, 2023, 1:45 pm1:45 pm

In this talk, I will describe an analytic procedure whereby scattering amplitudes are bootstrapped directly from an input mass spectrum and a handful of physical constraints: crossing symmetry, boundedness at high energies, and finiteness of exchanged spins. For an integer spectrum, this procedure gives a first…

EDI seminar, Jillian Bellovary: The CUNY Masters in Astrophysics Bridge Program
Fri, Mar 31, 2023, 1:30 pm2:30 pm

The CUNY Masters in Astrophysics program is in its first year, with the first cohort of students. I will give an overview of the design of the program, including the partnership between CUNY and the Flatiron Institute, recruitment strategies, mentoring structures, and anti-oppression work. Our goal is to increase opportunities for marginalized…

Hamilton Colloquium Series, Clifford Johnson, USC, "Wigner Meets ’t Hooft Near the Black Hole Horizon", March 30, Jadwin A10
Thu, Mar 30, 2023, 4:00 pm5:00 pm

There has been exciting recent progress in the study of the quantum nature of black holes through the use of certain exactly solvable models. This work shows how to realize, in concrete terms, various long-held expectations about quantum gravity, such as the transition from describing physics in terms of…

A free lecture open to the public.
Mathematical Physics Seminar, Tues, Mar 28, 4:30pm, Jadwin A06, Ron Peled, Tel Aviv University and IAS, "Minimal Surfaces in Random Environment"
Tue, Mar 28, 2023, 4:30 pm5:30 pm

A minimal surface in a random environment (MSRE) is a surface which minimizes the sum of its elastic energy and its environment potential energy, subject to prescribed boundary values. Apart from their intrinsic interest, such surfaces are further motivated by connections with disordered spin systems and first-passage percolation models. We…

Dark Cosmos - Molecules For Dark Matter Detection|Ben Lillard - UO, Joseph Henry Rm @4PM
Tue, Mar 28, 2023, 4:00 pm5:00 pm

Organic scintillators are a promising avenue for the direct detection of sub-GeV dark matter (DM). With eV-scale excitation energies that rival the sensitivity of semiconductor targets, they can be produced in bulk and purified relatively inexpensively. A low-background kilogram-size scintillator target could achieve world-leading sensitivity…

Faculty, Postdocs, graduate students
IAS HET Seminar | Savas Dimopoulos, SITP, Stanford University| “The Cosmic Neutrino Background (CνB): Its Distribution on the Surface of the Earth and its Manipulation by Laboratory-Scale Diffraction Gratings” | Bloomberg Lecture Hall & Zoom
Mon, Mar 27, 2023, 2:30 pm2:30 pm

The CνB is a cosmological relic analogous to the CMB, and contains information about the universe before it was one-second-old. Reflection of relic neutrinos from the surface of the Earth creates a significant local neutrino-antineutrino asymmetry in a shell seven meters thick around the Earth's surface. This asymmetry…

PGI Seminar Series Spring 2023|Lam Hui|Columbia University|Black hole perturbation theory: Love numbers and nonlinear ring-down
Mon, Mar 27, 2023, 12:30 pm1:30 pm

We will discuss two recent developments in black hole perturbation theory: 
(1) the symmetries behind the well-known vanishing of the tidal Love numbers, and
(2) second order quasi-normal modes during the ring-down phase after a binary merger.