Colloquia & Seminars

Speaker: Gerald Höhn (Kansas State University) & Sven Möller (University of Hamburg)

Title: Classification of Self-Dual Vertex Operator Superalgebras of Central Charge at Most

Quantum Matter Seminar Speakers: Gerald Höhn (Kansas State University) & Sven Möller (University of Hamburg) Title: Classification of Self-Dual Vertex Operator Superalgebras of Central Charge at Most 24 Abstract: We discuss the classfication of self-dual vertex operator superalgebras (SVOAs) of central charge 24, or in physics parlance the purely chiral 2-dimensional fermionic conformal field theories with just one primary field. There are exactly 969 such SVOAs under suitable regularity assumptions and the assumption that the shorter moonshine module VB^# is the unique self-dual SVOA of central charge 23.5 whose weight-1/2 and weight-1 spaces vanish. We construct and classify the self-dual SVOAs by determining the 2-neighbourhood graph of the self-dual (purely bosonic) VOAs of central charge 24 and also...

Speaker: Brandon C. Rayhaun, Stony Brook University

Title: Small Bosonic CFTs, Chiral Fermionization, and SymmetrySubalgebra Duality

Quantum Matter Seminar Speaker: Brandon C. Rayhaun (C. N. Yang ITP, Stony Brook University) Title: Small Bosonic CFTs, Chiral Fermionization, and Symmetry/Subalgebra Duality Abstract: Conformal field theories in (1+1)D are key actors in many dramas of physics and mathematics. Their classification has therefore been an important and long-standing problem. In this talk, I will explain the main ideas behind the classification of (most) “small” bosonic CFTs. Here, I use the adjective “small” informally to refer to theories with low central charge (less than 24) and few primary operators (less than 5). Time and attention permitting, I will highlight two applications of this result. First, I will describe how it can be used in tandem with bosonization and fermionization techniques...

Speaker: Suman Kundu, Weizmann Institute

Title: ‘Grey Galaxy’ as the endpoint of the Kerr-AdS super radiant blackhole

General Relativity Seminar Speaker: Suman Kundu (Weizmann Institute) Title: ‘Grey Galaxy’ as the endpoint of the Kerr-AdS super radiant blackhole Abstract: Kerr AdS$_{d+1}$ black holes for $d\geq 3$ suffer from classical superradiant instabilities over a range of masses near extremality. We conjecture that these instabilities settle down into Grey Galaxies (GG)s - a new class of solutions to Einstein's equations which we construct for $d=3$. Grey Galaxies consist of an $\omega=1$ black hole in the `centre' of $AdS$, surrounded by a uniformly thick and very large disk of thermal bulk matter that revolves around the centre of AdS at the speed of light. The parametrically low energy density and parametrically large radius of the gas disk are inversely related;...