Events Archive

Events Archive

HET Seminar | Oscar Varela, Utah State University | "AdS4/CFT3 Squashed, Stretched, Warped and Invaded" | via Zoom

Fri, Sep 25, 2020, 1:45 pm

The spectrum of single-trace operators of holographic CFTs at strong coupling and large N can be mapped to the spectrum of Kaluza-Klein modes over the dual AdS supergravity solutions.

Speaker(s):

Gravity Group Seminar | Paul Steinhardt, "Cosmological Bounces and Bouncing Cosmology"

Fri, Sep 25, 2020, 12:00 pm

The talk will introduce the group working on cosmological theories in which the big bang is replaced by a smooth, non-singular bounce and the large-scale properties of the universe are explained by a period of slow contraction that precedes the bounce.

Email Angela Lewis for Zoom registration...

FPO - Xiaowen Chen - "Statistical Physics Approaches to Collective Behavior in Networks of Neurons"

Thu, Sep 24, 2020, 2:00 pm

In recent years, advances in experimental techniques have allowed for the first time simultaneous measurements of many interacting components in living systems at almost all scales, making now an exciting time to search for physical principles of collective behavior in living systems.

FPO - Yaqiong Li - "Probing the Cosmic Microwave Background Radiation Using Large Superconducting Detector Arrays"

Thu, Sep 24, 2020, 9:00 am
The discovery and measurements of the Cosmic Microwave Background (CMB) radiation have laid the foundation of the current cosmological model, in which the universe is primarily composed of dark energy and dark matter.

HET Seminar | Joaquin Turiaci, UC Santa Barbara | "The gravitational path integral near extremality"| via Zoom

Mon, Sep 21, 2020, 2:30 pm

I will explain the relation between the Euclidean path integral over near-extremal black hole geometries and its dimensional reduction to 2D Jackiw-Teitelboim gravity. I will focus mostly on the case of 3D gravity and a particular application to pure 3D gravity.

Speaker(s):

PGI Virtual Seminar Series | Gabriele Benomio, "A new instability for higher dimensional black holes"

Mon, Sep 21, 2020, 12:30 pm

Abstract: In contrast with the classical stability of stationary, asymptotically flat black holes in four dimensions, some families of higher dimensional black holes suffer from dynamical instabilities.

To be Rescheduled. Biophysics Seminar: Kranthi Mandadapu, University of California Berkeley: TBD| Zoom

Mon, Sep 21, 2020, 12:15 pm

Details to follow.

Audience: A free lecture open to the public.
Speaker(s):

HET Seminar | Petr Kravchuk, Member, School of Natural Sciences, IAS | “Light-rays and detectors in Wilson-Fisher theory” | via Zoom

Fri, Sep 18, 2020, 1:45 pm

In conformal field theory, in contrast to gapped theories, S-matrix is not well-defined. Similarly, various inclusive observables which make sense in a gapped theory, such as "energy squared" calorimeters, suffer from IR divergences in CFTs.

Speaker(s):

Gravity Group Seminar | Meet the Gravity Group

Fri, Sep 18, 2020, 12:00 pm

We will kick off this season with a "Meet the Gravity Group" event. The format will be the same as last year's: all of us, be we juniors getting started on our Fall papers or emeritus, will get one slide and one minute to introduce ourselves to our new colleagues and share our spring / summer updates with the group.

HET Seminar | Zohar Komargodski, Simons Center for Geometry and Physics, Stony Brook University | “Non-Symmetries, Naturalness, and Two-Dimensional Adjoint QCD” | via Zoom

Mon, Sep 14, 2020, 2:30 pm

We will explain the notion of "non-symmetries" or "defect symmetries." We will show that massless two-dimensional QCD admits exponentially many such symmetries. We will use them to prove deconfinement as well as to compute exactly the tension of all k-strings in the small mass limit.

Speaker(s):

PGI Virtual Seminar Series | Alex Lupsasca, "The Shape of the Black Hole Photon Ring: A Precise Test of Strong-Field General Relativity"

Mon, Sep 14, 2020, 12:30 pm

We propose a new test of strong-field general relativity (GR) based on the universal interferometric signature of the black hole photon ring. The photon ring is a narrow ring-shaped feature, predicted by GR but not yet observed, that appears on images of sources near a black hole.

Biophysics Seminar: Bill Bialek & Josh Shaevitz, Princeton University: State of the Center| Zoom

Mon, Sep 14, 2020, 12:15 pm
Audience: A free lecture open to the public.
Speaker(s):

FPO - Laura Chang - Dark Matter in the Milky Way

Fri, Sep 4, 2020, 11:00 am

We have entered a data-driven era of astrophysics and cosmology, providing a wealth of datasets within which to search for the answers to some of the most fundamental open questions in the physics of our Universe.

FPO - Kelvin Mei - "A Search for Scalar Top Quarks in Final States with High Jet Multiplicity and a Lepton with the CMS detector at the Large Hadron Collider"

Mon, Aug 31, 2020, 3:30 pm

A search is conducted for scalar top quarks decaying in the Full Run II dataset for the Compact Muon Solenoid (CMS) experiment at the Large Hadron Collider (LHC) of 137.2\fbinv collected at a center of mass energy of √s = 14 TeV.

HET Seminar | Lorenz Eberhardt, Member, School of Natural Sciences, Institute for Advanced Study | “Partition functions of the tensionless string” | via Zoom

Fri, Aug 28, 2020, 1:45 pm

I discuss string theory on AdS3xS3xT4 in the tensionless limit, with one unit of NS-NS flux. This theory is conjectured to be dual to the symmetric product orbifold CFT.

Speaker(s):

FPO - Tong Gao - Thermal Transport Properties of Quantum Spin Liquid Materials

Fri, Aug 28, 2020, 10:00 am

Abstract Quantum spin liquids(QSL) have fascinated physicists for nearly half a century since Anderson first introduced this concept with his resonating-valence-bond(RVB) idea in 1973. Although many progresses had been made, more challenges emerge from both theoretical and experimental perspectives.

FPO - JaeUk Kim - Hyperuniformity of Point Patterns and Two-Phase Composite Media

Fri, Aug 28, 2020, 10:00 am

This dissertation focuses on the generation of certain special disordered systems, as well as general tools that have been developed to characterize their microstructures. Particular attention is devoted to disordered hyperuniform systems, which are ex- otic amorphous states of matter that lie between crystals and liquids.

FPO - Zheng Ma - "Generation and Structural Characterization of Non-Hyperuniform and Hyperuniform Disordered Systems"

Thu, Aug 27, 2020, 11:30 am

This dissertation focuses on the generation of certain special disordered systems, as well as general tools that have been developed to characterize their microstructures. Particular attention is devoted to disordered hyperuniform systems, which are ex- otic amorphous states of matter that lie between crystals and liquids.

HET Seminar | Andy Neitzke, Yale University | “An update on exact WKB and supersymmetric field theory” | via Zoom

Mon, Aug 24, 2020, 1:45 pm

Over the last decade it has become clear that there is a close connection between the BPS sector of N=2 supersymmetric field theories in four dimensions and the exact WKB method for analysis of ordinary differential equations (Schrodinger equations and their higher-order analogues).

Speaker(s):

HET Seminar | Leopoldo A. Pando Zayas, University of Michigan, Ann Arbor | "Sub-leading microstate counting of AdS black hole entropy" | via Zoom

Fri, Aug 21, 2020, 2:30 pm

I will briefly describe some recent progress in the microscopic understanding of the entropy of certain AdS black holes.

Speaker(s):

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