Yasuaki Hikida 副教授学术报告
Title: Complex saddles of three-dimensional de Sitter gravity via holography
Speaker: Yasuaki Hikida(疋田泰章)
Affiliation: Yukawa Institute for Theoretical Physics, Kyoto University, Japan（日本京都大学基础物理学研究所）
Time: 16:00-17:00, Monday, December 18, 2023 (UTC+8, Beijing Time)
Venue: Room 1502, Shing-Tung Yau Center, Yifu Architecture Building, Sipailou Campus of Southeast University, Nanjing
（东南大学四牌楼校区逸夫建筑馆丘成桐中心1502室）
Inviter: Ryo Suzuki
Abstract
It would be useful to deal with complex geometry when examining quantum gravity as in the case of no-boundary proposal by Hartle and Hawking. However, there would be too many saddles for complexified gravity, and it is necessary to determine which are allowable geometries in the sense of Witten. As a simple example, we examine three-dimensional gravity theory with positive cosmological constant described by Chern-Simons gauge theory. Applying dS3/CFT2 correspondence we recently proposed, we determine the set of allowable complex saddles for the Chern-Simons gravity from its dual conformal field theory.
Speaker
Professor Yasuaki Hikida received his PhD from the University of Tokyo in 2003 and continued his career as a postdoctoral fellow at Seoul National University, KEK (Japan) and DESY. Since 2016, he has been an Associate Professor at Yukawa Institute for Theoretical Physics.