BIMSA >
Quantum Fields and Strings Group Journal Club and Seminar
String Dualities and Compact Stars
String Dualities and Compact Stars
Organizer
Speaker
Kilar Zhang
Time
Thursday, November 7, 2024 2:50 PM - 4:20 PM
Venue
A3-4-101
Online
Zoom 462 110 5973
(BIMSA)
Abstract
We will give a brief report on the recent progress concerning the proof of AGT conjecture, the SW/QNM correspondence for black holes, and holographic QCD for neutron stars.
AGT conjecture reveals a connection between 4D gauge theory and 2D conformal field theory, and can be generalized to higher Dimensions. We give the proofs of 4D and 5D AGT conjecture at beta=1. In the 5D case, a q-deformed Selberg average formula of Schur polynomials is proposed and proved to complete the proof.
The newly established Seiberg-Witten (SW)/Quasinormal Modes (QNM) correspondence offers an efficient analytical approach to calculate the QNM frequencies, which was only available numerically before. We find that a similar duality exists between Seiberg-Witten theory and black hole superradiance. We also study the quasinormal modes (QNM) of the charged C-metric.
A theoretical equation of state for neutron stars with only one parameter is derived from Witten-Sakai-Sugimoto model, as an application of AdS/QCD, where pointlike instanton case is taken into consideration. Now we upgrade this model to instanton gas, with one more variable, the instanton width. This is not naively a free parameter, but a function of the chemical potential.
AGT conjecture reveals a connection between 4D gauge theory and 2D conformal field theory, and can be generalized to higher Dimensions. We give the proofs of 4D and 5D AGT conjecture at beta=1. In the 5D case, a q-deformed Selberg average formula of Schur polynomials is proposed and proved to complete the proof.
The newly established Seiberg-Witten (SW)/Quasinormal Modes (QNM) correspondence offers an efficient analytical approach to calculate the QNM frequencies, which was only available numerically before. We find that a similar duality exists between Seiberg-Witten theory and black hole superradiance. We also study the quasinormal modes (QNM) of the charged C-metric.
A theoretical equation of state for neutron stars with only one parameter is derived from Witten-Sakai-Sugimoto model, as an application of AdS/QCD, where pointlike instanton case is taken into consideration. Now we upgrade this model to instanton gas, with one more variable, the instanton width. This is not naively a free parameter, but a function of the chemical potential.