Conventionally, the main focus for the cosmic evolution of our universe has been on descriptions in terms of particles: dark matter (DM) as massive particle, and dark radiation, if existing at all, in the form of massless or very light particle.

# Events Archive

## 2019

### Pheno & Vino Seminar | Sungwoo Hong, Cornell | "Conformal Freeze in" | Jadwin 303

### HET Seminar | Andrea Dei, ETH Zurich | "Three-point functions in AdS3/CFT2 holography." | Jadwin A06

String theory on AdS3xS3xT4 with one unit of NSNS flux has been recently argued to be dual to the symmetric product orbifold of T^4. The duality has been extended to the case of generic NSNS background flux. I will consider the bosonic version of this duality and show how to match null-vector constraints on three-point functions.

### High Energy Theory - "Supersymmmetric Lifshitz Field Theories", Avia Raviv-Moshe - Tel-Aviv

Abstract: Lifshitz scaling is an anisotropic scaling where time and space scale differently. Quantum field theories that exhibit Lifshitz scale symmetry provide a framework for studying low energy systems with an emergent dynamic scaling such as quantum critical points.

### Gravity Initiative Lunch, Paul Chesler | Harvard "Internal geometry of black holes"

Abstract:

### Gravity Group Seminar | October 04, 2019

### Hamilton Colloquium Series, Allan H. MacDonald, University of Texas at Austin, "Magic Angle Twisted Bilayer Graphene" Jadwin A10

Moiré patterns are ubiquitous in layered van der Waals materials and can now be fabricated with considerable control by combining mechanical exfoliation of van der Waals layers with tear and stack device fabrication techniques. I will explain why the electronic and optical properties of two-dimensional semiconductors and semimetals are...

### HET Seminar | Jorge Santos, Cambridge | “Hawking Radiation at Strong Coupling: A Case for Braneworld Black Holes” | Bloomberg Hall Physics Library

Gauge/gravity duality relates certain strongly coupled CFTs with large effective central charge to semi-classical gravitational theories with AdS asymptotics. I will describe recent progress in understanding gravity duals for CFTs on non-trivial spacetimes with black hole horizons.

### Pheno & Vino Seminar | Andrea Caputo, Valencia University | "Looking for Axion Dark Matter: from Dwarf Galaxies to Pulsars" | Jadwin 303

Axion and Axion-like particles are fascinating dark matter candidates and a great effort has been devoted to their study, both theoretically and experimentally.

### High Energy Theory - "Probing nonperturbative structures in gravity with SYK model" Mikhail Khramtsov - Steklov Institute | Jadwin A06

My talk is devoted to studies of large N saddle point structures in the SYK model beyond the commonly used approximations, in particular the replica-diagonal assumption and the conformal limit. We will discuss new solutions of the saddle point equations in the SYK and their role in physics of the model and in the gravity dual description.

### HET Seminar - Andrew Turner - Massachusetts Institute of Technology

### HET Seminar | Andrew Turner, MIT | "General F-theory Models with SU(3) x SU(2) x U(1) / Z_6 Symmetry” | Bloomberg Lecture Hall

We construct a general form for an F-theory Weierstrass model over any base giving a 6D or 4D supergravity theory with gauge group SU(3) x SU(2) x U(1) / Z_6 and associated generic matter. The concept of 'generic matter' can be rigorously defined in 6D supergravity and generalizes naturally to four dimensions for F-theory models.

### Biophysics Seminar: Andrew Mugler, Purdue University: Physics of collective cell sensing|Joseph Henry Room

**Physics of collective cell sensing**

### HET Seminar | Sebastian Mizera, IAS | “Aspects of Scattering Amplitudes and Moduli Space Localization” | Bloomberg Lecture Hall

We review a recent geometric formulation of the tree-level S-matrix of various quantum field theories, including gauge and gravity theories, in terms of intersection numbers of twisted cohomology groups on the moduli space of genus-zero curves with marked points.

### Hamilton Colloquium Series, Adam Burrows, Princeton University, "Supernova Explosion Simulations in Three Dimensions" Jadwin A10

Using our state-of-the-art code Fornax we have simulated the collapse and explosion of the cores of many massive-star models in three spatial dimensions.

### Physics Group Meeting | Joonho Kim, IAS | "Cardy Formula and AdS Black Holes” | Bloomberg Hall Physics Library

I will discuss recent progress about the Cardy-like asymptotics of 4d supersymmetric index on S^3, also known as superconformal index. The main observation is that Bose-Fermi cancellation that trivializes the asymptotic expression of the index can be obstructed by complexifying chemical potentials.

### Simons Fall Workshop | Forefronts of Gravitational Physics

**Confirmed Speakers:**

### Forefronts of Gravitational Physics

Simons Foundation and Princeton Gravity Initiative Program on

Forefronts of Gravitational Physics presents

Beverly Berger, Stanford**"The Dawn of Gravitational Wave Astronomy" **A New Window on the Universe

**...**

### Math Physics Seminar, | Simone Warzel, TU, Munich | "The Quantum Random Energy Model" | Jadwin A06

The quantum random energy model serves as a simple cornerstone, and a testing ground, for a number of fields. It is the simplest of all mean-field spin glass models in which quantum effects due to the presence of a transversal field are studied. Renewed interest in its spectral properties arose recently in connection with many-body...

### Pheno & Vino Seminar | Sebastian Macaluso, NYU | ": Looking into Jets with Machine Learning" | Jadwin 303

Recent work has introduced a correspondence between jets and natural languages. In this talk, I will review how machine learning, with this natural language processing point of view, is changing the way we are thinking about jets. First, I will describe a very effective model for classification and regression tasks.