Events Archive

Many-body ground states and collective excitations in a tunable 2D system
Tue, Nov 8, 2022, 12:30 pm1:30 pm

The Landau levels of a two-dimensional electron system support a plethora of fascinating many-body ground states and collective low-energy excitations, thanks to enhanced electron-electron interactions and the characteristics of the LL wave functions. The n=1 LL is particularly fascinating as it hosts even-denominator fractional quantum Hall…

Mathematical Physics Seminar, Tues, Oct 3, 4:30pm, Jadwin A07, Jakob Bjornberg, University of Gothenburg, "Dimerisation in mirror models and quantum spin chains"
Tue, Oct 3, 2023, 4:30 pm5:30 pm

We consider two models of random loops where we prove breaking of translational symmetry. The first is a mirror model, where the loops are formed by light rays bouncing in a labyrinth of randomly oriented mirrors. The second is a probabilistic representation of a quantum spin chain, and can be obtained as a limit of the first, for inhomogeneous…

HET Seminar |Hirosi Ooguri, Caltech & Kavli IPMU| “Symmetry Resolution at High Energy” | IAS
Mon, Oct 2, 2023, 2:30 pm3:30 pm

The density of states of a unitary conformal field theory is known to have a universal behavior at high energy. In two dimensions, this behavior is described by the Cardy formula. If the theory has symmetry, it is interesting to understand the symmetry resolution, namely the decomposition of its Hilbert space into irreducible representations of…

Princeton Gravity Initiative - What’s inside a black hole - Ram Brustein (Ben-Gurion University)
Mon, Oct 2, 2023, 12:30 pm1:30 pm

I will present general arguments, based on fundamental physics principles, as to why we should expect a significant, horizon scale, departure from semiclassical gravity inside astrophysical black holes. Then, I will present a simple model which realizes this idea: the frozen star model. I will show that a static frozen star looks exactly like a…

Faculty, Postdocs, graduate students
HET Seminar |Silviu Pufu, Princeton | “ Two approaches to adjoint QCD_2” | PCTS
Fri, Sep 29, 2023, 11:00 am11:00 am

 In this talk, I will discuss the 2d SU(N) gauge theory coupled to an adjoint Majorana fermion using two approaches.  First, I will describe the computation of the spectrum at finite N using Discretized Light-Cone Quantization.  Then, for the N=2 case, I will introduce a Hamiltonian lattice model that can also be used to compute…

Postdoc Career Panel
Thu, Sep 28, 2023, 11:30 am1:30 pm
Physics faculty, post docs, grads
Mathematical Physics Seminar, Tues, Sep 26, 4:30pm, Jadwin A07, Margherita Disertori, University of Bonn,"Phase transition in the Integrated Density of States of the Anderson model arising from a supersymmetric sigma model"
Tue, Sep 26, 2023, 4:30 pm5:30 pm

Localization/delocalization transition in random Schrödinger operators cannot in general be seen from the behavior of the corresponding Integrated Density of States (IDS). Here we consider a random Schrödinger operator appearing in the study of certain reinforced random processes in connection with a supersymmetric sigma-model, and show that…

Title: Foundation Models for Science: What happens if we train large (language) models on scientific data? - Shirley Ho
Mon, Sep 25, 2023, 4:30 pm5:30 pm

Abstract: In recent years, the fields of natural language processing and computer vision have been revolutionized by the success of large models pretrained with task-agnostic objectives on massive, diverse datasets. This has, in part, been driven by the use of self-supervised pretraining methods which allow models to utilize far more training…

Faculty, Postdocs, graduate students
IAS HET Seminar | David E. Kaplan, Johns Hopkins University | “Non-Linear Quantum Mechanics” | Bloomberg Lecture Hall (IAS) & Zoom
Mon, Sep 25, 2023, 2:30 pm2:30 pm

We add non-linear and state-dependent terms to the Hamiltonian of quantum field theory. The resulting low-energy theory, non-linear quantum mechanics, is causal, preserves probability and permits a consistent description of the process of measurement. We explore the consequences of such terms and show that non-linear…

Biophysics Seminar: Walter Reisner | McGill University | Nanofluidic Devices for Single-Molecule Analysis, Manipulation and Control
Mon, Sep 25, 2023, 12:30 pm1:30 pm

Nanofluidic devices, e.g. based on nanochannels or nanopores, are networks of fluid-filled structures on a chip with dimensions ~1-100 nm.  These dimensions are on order of molecular length scales, giving rise to the ability to directly analyze, manipulate and confine single biomolecules.  In this talk I will focus on two different…

Open to all
Princeton Gravity Initiative - w(1+infinity) Symmetry in 4D Gravitational Scattering - Elizabeth Himwich
Mon, Sep 25, 2023, 12:30 pm1:30 pm

In four-dimensional asymptotically flat spacetimes, the infinite tower of soft graviton modes is known to generate a w(1+infinity) symmetry algebra at tree-level.  In this talk, I will review this symmetry and demonstrate that it acts non-trivially on massive scalar particles.  The symmetry action is derived from previously-discovered…

Faculty, Postdocs, graduate students
HET Seminar | Valentin Reys, IPhT, Saclay | “Precision holography for (non-)susy observables” | PCTS
Fri, Sep 22, 2023, 11:00 am11:00 am

I will review recent progress in understanding perturbative corrections to the large N limit of various observables in holographic 3d SCFTs. For supersymmetric observables, these corrections are obtained from supersymmetric localization and can be used to infer the value of higher-derivative couplings in the dual…

Mathematical Physics Seminar, Tues, Sept 19, 4:30pm, Jadwin A07, Oren Yakir, Tel-Aviv University, "Random Weierstrass zeta functions"
Tue, Sep 19, 2023, 4:30 pm5:30 pm

In electrostatic terminology, an electrical field of a stationary point process is a vector field whose distributional divergence is equal to the counting measure of the point process minus the Lebesgue measure. In the talk we will give a simple answer to the following question: when does a planar stationary point process generate a stationary…

HET Seminar |Tom Shachar, The Racah Institute of Physics | “ RG flows on two-dimensional spherical defects” | PCTS
Tue, Sep 19, 2023, 2:00 pm2:00 pm

The irreversibility of RG flows on conformal defects has been a subject of great interest recently. In this talk I will present an entropy function defined on 2D spherical defects, interpolating between the defect anomaly coefficient at the fixed points. We reproduce the IR sum-rule proving irreversibility and show…

HET Seminar |Christian Ferko, UC Davis | “Three Perspectives on Two Throats” | PCTS
Mon, Sep 18, 2023, 2:30 pm2:30 pm

For certain black hole spacetimes, we are fortunate to have three complementary views of the same physics: (1) the low-energy gravity theory on the spacetime M, (2) worldsheet string theory with target space M, and (3) a holographic description living on the boundary of M. In this talk, I describe ongoing efforts to compare these perspectives…

Biophysics Seminar: Arup Chakraborty | MIT | The Evolution of Antibody Responses upon Vaccination
Mon, Sep 18, 2023, 12:30 pm1:30 pm

Infectious disease-causing pathogens have plagued humanity since antiquity, and the COVID-19 pandemic has been a vivid reminder of this perpetual existential threat. Vaccination has saved more lives than any other medical procedure, and effective vaccines have helped control the COVID-19 pandemic. However, we do not have effective vaccines…

Open to the Public
Princeton Gravity Initiative - Tower of states and black holes - Alex Bedroya
Mon, Sep 18, 2023, 12:30 pm1:30 pm

The towers of massive states in quantum gravity are ubiquitous and highly constrained. I will review some of the Swampland conjectures, known as distance conjectures, that quantify the universal behaviors of such towers in string theory. Due to the strong implications of distance conjectures, connecting them to more fundamental principles…

Faculty, Postdocs, graduate students
IAS HET Seminar | Aidan Herderschee, Member, School of Natural Sciences, IAS | “The Next-to-Leading Order Scattering Waveform from Amplitudes” |Bloomberg Lecture Hall (IAS) & Zoom
Fri, Sep 15, 2023, 11:00 am11:00 am


I will showcase the computation of the next-to-leading order scattering waveform in classical gravity using amplitude techniques. I will first give an overview of how to compute generic classical observables in gravity using scattering amplitude techniques in the KMOC formalism. In particular, I will…

IAS HET Seminar | Leonard Susskind, Stanford University| “"DSSYK∞ and its Possible Dual Relation to JT-de Sitter Space"” | Zoom
Thu, Sep 14, 2023, 11:00 am11:00 am

I will explain my reasons for thinking that the double-scaled SYK theory at infinite temperature is a theory of de Sitter space.


Biophysics Seminar: Bill Bialek & Josh Shaevitz | Princeton University | State of the Center
Mon, Sep 11, 2023, 12:30 pm1:30 pm
Open to the Public