# Activities

## Workshop/Conferences

KAIST Workshop on Aspects of Quantum Field Theory (04/01/2024 - 04/05/2024)

Recent Trends in Supersymmetric Field Theories (10/27/2023 - 10/31/2023)

Workshop on Geometry, Representation theory and Quantum Fields (03/22/2022 - 03/25/2022)

Research Summary 2021: Fields and Gravity (11/28/2021 - 11/30/2021)

## KAIST High-Energy Theory Seminar

## High-Energy Theory Seminar 2022 (Fields and Strings)

Time and Place: Thursday at 1 PM, E6-1323

Nov. 3rd Tadashi Okazaki (KIAS) - Supersymmetric observables via Fermi-gas method

Oct. 6th Monica Jinwoo Kang (Caltech) - Counting states with global symmetry

Oct. 4th Craig Lawrie (DESY) - Distinguishing 6d (1, 0) SCFTs (Special seminar 4 PM @ E6-2501)

Sep. 15th Christopher Couzens (Kyunghee Univ.) - AdS Black Holes: a review

Jun. 15th Changha Choi (Stony Brook Univ.) - EFT of non-maximal Chaos (slides)

## High-Energy Theory Seminar 2020-2021 (Fields and Strings)

### Oct. 26th (10/26/2021) @ E6-2 #2502

Ye-in Lee (Kyunghee University): "Tidal Love numbers in the small deformed geometry"

Ye-in Lee (Kyunghee University): "Tidal Love numbers in the small deformed geometry"

Abstract: There are various approaches for the perturbation to the black holes. Among them, we can compare the perturbation through the Newman-Penrose formalism to the Regge-Wheeler equation. Solving the Teukolsky equations using the Newman-Penrose formalism we can obtain their tidal Love numbers which can be observed physically. It is well known that the tidal Love numbers of black holes in general relativity vanish and it could be interpreted as a manifestation of the no-hair theorem. However for spherically symmetric deformed black holes, the Love numbers are known to be non-vanishing, and this can be the strong test in general relativity. We solve the Teukolsky equations for various small deformed black hole geometries and read their tidal Love numbers.

### Mar. 30th (03/30/2021) at 11 am

Craig Lawrie (University of Pennsylvania): "Torus Compactifications of 6d (1,0) SCFTs and Class S"

Craig Lawrie (University of Pennsylvania): "Torus Compactifications of 6d (1,0) SCFTs and Class S"

Abstract: Studying compactifications of 6d theories has led to a wealth of understanding about lower dimensional quantum field theories. In this seminar, I will discuss two different 6d origins for 4d superconformal field theories with N=2 supersymmetry. The first involves compactifying 6d N=(1,0) SCFTs on torus -- a vast landscape of such 6d SCFTs are known to have geometric constructions, and I shall review this construction. The second origin is the Class S framework, where the 4d theories are obtained as compactifications of the 6d N=(2,0) SCFTs on a punctured Riemann surface. I will demonstrate that a subset of 4d N=2 SCFTs can be obtained from both origins, and discuss the physical implications of such a plurality of origins.

### Oct. 16th (10/16/2020)

### Kanghoon Lee (APCTP): "Duality manifest approach for double copy"

Abstract: I will present a generalization of the conventional Kerr-Schild(KS) formalism, a powerful tool for constructing exact solutions in general relativity, to the double field theory(DFT), exceptional field theory (ExFT) and supergravities. First, DFT and ExFT are explained. Then I’ll describe the KS ansatz for the generalized metric for DFT and ExFT and yield that their equations motion reduce to linear equations. Based on this formalism, I’ll introduce the exact double copy, which represents solutions of the Einstein equation in terms of solutions of the Maxwell equation. slides