**To connect to the HET Seminar via Zoom, please click the following link:**

https://theias.zoom.us/j/96660745132?pwd=Y3FPUWVDZlNwUEdINkxjSnNhK0dpZz09

# Events Archive

## Events Archive

### HET Seminar | Dalimil Mazac, Member, School of Natural Sciences, IAS | “Dispersive CFT Sum Rules” | via Zoom

### Gravity Group Seminar | Javier Romualdez, Steven Benton, and Steven Li (Princeton University), "An Introduction to SuperBIT & GigaBIT: The Ups and Downs of Balloon-borne Optical Astrophysics"

The Super-pressure Balloon-borne Imaging Telescope (SuperBIT) is the first-of-its-kind, three-axis stabilized, high-resolution, wide-field imager designed to provide weak lensing measurements in near-UV to near-IR bands (300–1000 nm).

### Hamilton Colloquium Series, Leonid Mirny, MIT, "Physics of Your Chromosomes" via Zoom

DNA of the human genome is 2 meters long and is folded into chromosomes that fit in a 10-micron cellular nucleus. I will discuss physical principles that govern folding of long DNA molecules, including phase separation, topological effects in polymer systems, and non-equilibrium phenomena.

### Research Town Hall: Fall 2020

Wed, Sep 30, 2020, 4:00 pm to 5:30 pm

### Seminar Series on Equity, Diversity and Inclusion | The Department of Physics and The Department of Astrophysics | Shawn Maxam, Office of Provost, Princeton University |"Racial Diversity and Underrepresentation in STEM" | via Zoom

**To join please click on link below:**

https://princeton.zoom.us/j/95803586483?pwd=ZFZEKzRMTkZwd0N1SlM5c0lGT0w3...

Meeting ID: 958 0358 6483

### HET Seminar | Thomas Faulkner, University of Illinois Urbana-Champaign | “The Holographic Map as a Conditional Expectation” | via Zoom

To connect to the HET Seminar via Zoom, please click the following link:

https://theias.zoom.us/j/92467790530?pwd=WUI3U1RCRCtYSjJyV1A2Vmx6dk81QT09

### PGI Virtual Seminar Series | Elias Most "Neutron star mergers: On the impact of high spins in multi-messenger gravitational wave events"

### Biophysics Seminar: Gurol Suel, University of California San Diego| The role of inorganic ions in bacterial resilience

We have been working to measure and understand how ion fluxes and ionic interactions regulate fundamental biological processes, and in particular promote stress tolerance in bacteria. I will present our recent work that builds on our discovery of action potentials generated within bacterial biofilms.

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

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.

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

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"

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"

### PRISM / PCCM Seminar Series Fall 2020

The Princeton Center for Complex Materials (PCCM) and the Princeton Institute for the Science and Technology of Materials (PRISM) co-sponsor a seminar series that is held on Wednesdays throughout the semester.

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

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.

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

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.

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

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.

### Gravity Group Seminar | Meet the Gravity Group

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.

### PRISM / PCCM Seminar Series Fall 2020

The Princeton Center for Complex Materials (PCCM) and the Princeton Institute for the Science and Technology of Materials (PRISM) co-sponsor a seminar series that is held on Wednesdays throughout the semester.

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

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.

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

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.