# Events Archive

## High Energy Theory Seminar

### HET Seminar | Ellis Ye Yuan, School of Natural Sciences, IAS | “Projective Geometry of Scattering Amplitudes”

Fri, Oct 28, 2016, 1:45 pm to 2:45 pm

I will introduce a technique in studying the analytic structure of perturbative S-matrix of QFTs. The main idea is to associate Feynman integrals to objects in a projective space: polytopes and hypersurfaces.

### HET Seminar | Alba Grassi, ICTP in Trieste | "Topological string, spectral theory and Painlevé equations"

Mon, Oct 24, 2016, 2:30 pm to 3:30 pm

In this talk I will review some aspects of a recently proposed duality between topological string on toric Calabi-Yau manifolds and the spectral theory of trace class operators. I will discuss the relation between this construction and Painlevé equations which can be used to prove the duality in a 4-dimensional limit.

### Subir Sachdev, Harvard University, "Strange Metals, Black Holes, and Graphene”

Mon, Oct 17, 2016, 2:30 pm to Tue, Oct 11, 2016, 3:30 pm

States of quantum matter without quasiparticles can be more precisely characterized by their rapid approach to local thermal equilibrium: this is argued to happen in a shortest possible time of order (Planck’s constant)/((Boltmann’s constant)x(absolute temperature)).

### HET/IAS Seminar | Subir Sachdev, Harvard University | “Strange Metals, Black Holes, and Graphene”

Mon, Oct 17, 2016, 2:30 pm to 3:30 pm

States of quantum matter without quasiparticles can be more precisely characterized by their rapid approach to local thermal equilibrium: this is argued to happen in a shortest possible time of order (Planck’s constant)/((Boltmann’s constant)x(absolute temperature)).

### Francesco Benini, Junior Faculty Member, School of Natural Sciences, IAS; SISSA (Trieste), “AdS Black Hole Entropy and Gauge Theory”

Fri, Oct 14, 2016, 1:45 pm to Tue, Oct 11, 2016, 3:00 pm

I will discuss how to relate the entropy of BPSblack holes in AdS to counting of states in gaugetheory, presenting examples where this can besuccessfully done as well as examples where thisdoes not seem to work.

### HET/IAS Seminar | Francesco Benini, School of Natural Sciences, IAS; SISSA (Trieste) | “AdS Black Hole Entropy and Gauge Theory”

Fri, Oct 14, 2016, 1:45 pm to 2:45 pm

I will discuss how to relate the entropy of BPS black holes in AdS to counting of states in gauge theory, presenting examples where this can be successfully done as well as examples where this does not seem to work.

### Lena Funcke, Max Planck Institute for Physics and Ludwig Maximilian University of Munich - “Rethinking the Origin of Small Neutrino Masses”

Tue, Oct 11, 2016, 1:30 pm to 3:00 pm

The observed small neutrino masses are one of the greatest mysteries in current theoretical particle physics. Many possible origins have been proposed so far, such as the see-saw mechanism, radiative corrections, or large extra dimensions.

### HET Seminar | Oliver DeWolfe | University of Colorado |“Fermions at strong coupling and finite density from top-down holography"

Mon, Oct 10, 2016, 2:30 pm to 3:30 pm

### HET Seminar | Dalimil Mazac | Perimeter Institute | "Towards Analytic Conformal Bootstrap"

Mon, Oct 3, 2016, 2:30 pm to 3:30 pm

Conformal bootstrap equations have demonstrated a strong constraining power in various spacetime dimensions. However, the most exciting results concerning the low-lying spectrum of operators have only been derived using extensive numerics. It is therefore very important to develop the corresponding analytic understanding.

### HET Seminar | Kantaro Ohmori | School of Natural Sciences, IAS | “M-theory and 6d SCFTs”

Fri, Sep 30, 2016, 1:45 pm to Thu, Sep 29, 2016, 3:00 pm

When a M5 branes probes the singular locus of the D,E type ALE orbifold, the M5 brane exhibits fractionation, which corresponds to activating tensor branch moduli of the 6d N=(1,0) SCFT living on the M5.
I explain how the fractionation patterns can be identified using the T^3 compactification, and propose some open problems related to M-theory...

### HET Seminar | Vijay Balasubramanian | University of Pennsylvania | “New Forms of Entanglement and Holography”

Mon, Sep 26, 2016, 2:30 pm to 3:30 pm

### HET Seminar | Yifan Wang | Princeton University | "Superconformal Bootstrap in Two Dimensions"

Fri, Sep 23, 2016, 1:45 pm to 2:45 pm

Abstract: The enhanced super-Virasoro symmetries in 2d have allowed us to extract many BPS quantities exactly from 2d superconformal field theories (SCFT). In this talk, we will take advantage of our past knowledge about 2d (2,2) SCFTs, combining with the method of conformal bootstrap, to explore features of 2d (2,2) SCFTs beyond the protected...

### Gary Horowitz, UC Santa Barbara - “Recovering the Spacetime Metric from a Holographic Dual”

Mon, Sep 19, 2016, 2:30 pm to 4:00 pm

I will describe a new approach to determining the bulk geometry from a dual field theory. This is based on a special class of spacelike cross-sections of the boundary called light-cone cuts. I will first show that the conformal metric in the bulk (i.e.

### David R. Morrison, UC Santa Barbara - "TBA"

### Jeffrey Harvey, UChicago - "Moonshine, old and new”

Mon, Sep 12, 2016, 2:30 pm to 4:00 pm

Moonshine in mathematics originally referred to unexpected connections between the modular J function and the representation theory of the Monster, the largest sporadic finite group.

### HET Seminar | Apratim Kaviraj | Indian Institute of Science | Conformal Bootstrap in Mellin space

Fri, Sep 9, 2016, 1:45 pm to 3:00 pm

### Zohar Komargodski "Strings from Massive Higher Spins: The Asymptotic Uniqueness of the Veneziano Amplitude"

Tue, Jul 19, 2016, 2:30 pm to 4:00 pm

Zohar Komargodski | The Weizmann Institute of Science, Rehovot, Israel.
"Strings from Massive Higher Spins: The Asymptotic Uniqueness of the Veneziano Amplitude"

### High Energy Theory Seminar David Kosower, PCTS Seminar Room 407

Fri, Jun 3, 2016, 1:45 pm to 3:00 pm

Higher-Order Results from BlackHat

### Arnab Rudra, University of California, Davis | String theory low energy expansion and M theory amplitudes

Wed, Jun 1, 2016, 1:30 pm to 3:00 pm

Description: The goal of this discussion will be to first provide a broader picture and then to discuss the most recent work. I will review the general features of Low energy expansion of stringy amplitudes (tree level and one-loop) and it's relation to number of non-compact dimensions.

### Physics Group Meeting - IAS - Discussion group led by Masahito Yamazaki, IAS

Wed, May 25, 2016, 1:30 pm to 2:30 pm

Description: I will discuss the discrete Liouville theory and its connection with cluster algebras, Teichmuller theory and supersymmetric gauge theories.
References:
The version of discrete Liouville I discuss has been formulated by many papers by Faddeev, Volkov, Takhajan, Kashaev. A good starting point is:
Faddeev, Kashaev, Volkov hep-th/...