张宏宝 教授学术报告
Title: Background subtraction versus holographic renormalization in Euclidean quantum gravity
Speaker: Hongbao Zhang (张宏宝)
Affiliation: Beijing Normal University (北京师范大学)
Time: 15:00-16:00, Tuesday, 1st April, 2025 (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: Qiang Wen (文强)
Abstract
Although background subtraction is much simpler than holographic renormalization in extracting the finite data in Euclidean quantum gravity, its applicability has long been blamed to be rather restrictive compared to holographic renormalization since it was proposed by Hawking in the 1970s. In this talk, I will argue that background subtraction is actually as applicable as holographic renormalization by using covariant phase space formalism, whereby the check of the validity of the first law of black hole thermodynamics is also dramatically simplified compared to the prevailing strategy in the Euclidean approach to black hole thermodynamics. I will conclude my talk with the direct impact of our work on the methodology shift in the calculation of higher derivative corrections to black hole thermodynamics.
Speaker
Professor Hongbao Zhang is a faculty member in the Department of Physics at Beijing Normal University (BNU). He completed his undergraduate studies at BNU, obtained his MSc from Peking University, and received his PhD through a joint program involving NBU, Perimeter Institute, and University of Waterloo in Canada. He has conducted postdoctoral research at Crete Center for Theoretical Physics in Greece, Vrije Universiteit Brussel, and The International Solvay Institutes in Belgium. His current research interests focus on the application of numerical relativity in AdS/CFT correspondence and astrophysics, and the covariant phase space formalism in field theories including gravity.