# Events Archive

## 2016

### HET Seminar | Daniel Park, Rutgers University | "Towards Finding All Elliptically Fibered Calabi-Yau Threefolds"

Mon, Nov 7, 2016, 2:30 pm to 3:30 pm
I will review the efforts made towards approaching string universality in six dimensions and report recent "cartographic" developments on exploring the landscape of six-dimensional string vacua. A working conjecture is that all six-dimensional string vacua can be constructed in F-theory, which leads to the problem of classifying all elliptically...

### CM Video Seminar, Andy Mackenzie, Max Planck, "Delafossite metals: ultra-high conductivity on two-dimensional triangular lattices"

Mon, Nov 7, 2016, 1:15 pm to 2:15 pm
The delafossites are a series of layered compounds with triangular lattices similar to that of NaCoO2 but with a different stacking sequence along the c axis. They are host to intriguing magnetic insulators and semimetals, as well as metals such as PdCoO2, PtCoO2, PdCrO2 and PdRhO2. The properties of these metals are remarkable.

### HET Seminar | Xi Dong, Member, School of Natural Sciences, IAS | "The Ryu-Takayanagi Formula and Extremal Surfaces”

Fri, Nov 4, 2016, 1:45 pm to 2:45 pm
The Ryu-Takayanagi formula and its quantum-corrected version are useful in understanding many aspects of quantum gravity such as subregion duality, emergence of the radial direction, and the generalized second law.

### 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.

### Gravity Group Seminar, Jonathan Blackman (CIT)

Fri, Oct 28, 2016, 12:00 pm to 1:30 pm

TITLE Surrogate models of gravitational waveforms from numerical relativity simulations of black hole mergers ABSTRACT GW150914 was the first detection of gravitational waves from a binary black hole merger, bringing us into the era of gravitational wave astronomy.

### Hamilton Colloquium Series: David Vanderbilt, Rutgers University; “The search for quantum anomalous Hall insulators”

Thu, Oct 27, 2016, 4:30 pm to 6:00 pm

*Please note this colloquium starts at 4:30 p.m.* The quantum Hall effect, discovered 35 years ago, is a bizarre phenomenon in which a 2D gapped system can nevertheless carry a current. Moreover, the transverse conductivity of the system is precisely quantized in units of e^2/h.

### Math Physics Seminar, Eviatar Procaccia, Texas A & M, "Can one hear the shape of a random walk?"

Tue, Oct 25, 2016, 4:30 pm to 5:30 pm
We consider a Gibbs distribution over random walk paths on the square lattice, proportional to a random weight of the path’s boundary . We show that in the zero temperature limit, the paths condensate around an asymptotic shape.

### Pheno & Vino Seminar, David Shih, Rutgers, "Cornering Natural SUSY at the LHC"

Tue, Oct 25, 2016, 4:00 pm to 5:30 pm
We derive the latest constraints on various simplified models of natural SUSY with light higgsinos, stops and gluinos, using a detailed and comprehensive reinterpretation of the most recent 13 TeV ATLAS and CMS searches with $\sim 15$~fb$^{-1}$ of data. We discuss the implications of these constraints for fine-tuning of the electroweak scale.

### 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.

### Gravity Group Seminar, Ben Racine (University of Oslo) "B modes and component separation: the Gibbs sampling solution"

Fri, Oct 21, 2016, 12:00 pm to 1:30 pm

Detecting B-modes due to inflationary gravitational waves in the polarization of the Cosmic Microwave Background is one of the greatest goals of modern observational cosmology. Many experiments have been designed to detect this weak signal, and upper limits are improving year by year.

### Hamilton Colloquium Series: Stephen Shenker, Stanford; "Quantum gravity and quantum chaos"

Thu, Oct 20, 2016, 4:00 pm to 5:30 pm

One hallmark of chaos is sensitive dependence to initial conditions, the “butterfly effect.” We will discuss recent advances in our understanding of the quantum butterfly effect and its connection to the quantum physics of black holes. We will discuss a universal bound on the rate of development of quantum chaos motivated by these developments...

### Brian Swingle, Stanford University, “Entanglement Structure of Non-Equilibrium Steady States”

Wed, Oct 19, 2016, 1:45 pm to Tue, Oct 11, 2016, 3:00 pm
Physics Group Meeting

### Special CM Seminar, Arbel Haim, Weizmann, "Current aspects of topological superconductivity"

Wed, Oct 19, 2016, 1:30 pm to 3:00 pm
Abstract: Recent experiments have provided mounting evidence for the existence of Majorana bound states (MBSs) in condensed-matter systems. Until the long-term goal of braiding MBSs is achieved, one is prompted to ask: what is the next step in the study of topological superconductivity and MBSs? In my talk I will discuss two topics relating to...

### Math Physics Seminar, Vieri Mastropietro, U. of Milano, "Localization of interacting fermions with quasi-random disorder"

Tue, Oct 18, 2016, 4:30 pm to 5:30 pm
We consider interacting electrons in a one dimensional lattice with an incommensurate Aubry-Andre' potential in the regime when the single-particle eigenstates are localized.

### Pheno & Vino Seminar, Matthew Reece, Harvard "Exploring the Weak Gravity Conjecture"

Tue, Oct 18, 2016, 4:00 pm to 5:30 pm
The Weak Gravity Conjecture (WGC), in its original form, says that given an abelian gauge theory there should be at least one charged particle whose charge is bigger than its mass in Planck units. This has surprisingly powerful implications for the possibility of large-field inflation.

### Special Math Physics Seminar, Anna Vershynina, Basque Center, Spain, "Quantum analogues of geometric inequalities for Information theory"

Mon, Oct 17, 2016, 2:30 pm to 3:30 pm
Geometric inequalities, such as entropy power inequality or the isoperimetric inequality, relate geometric quantities, such as volumes and surface areas. Classically, these inequalities have useful applications for obtaining bounds on channel capacities, and deriving log-Sobolev inequalities.

### 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)).