Speaker: 年骏 (中国科学院大学)
Time: 2025-12-25 15:00-16:00
Location: 1510, SIMIS
Zoom Meeting ID: 873 9342 1118 Passcode: SIMIS
Abstract:
Since its advent in the late 90s, the AdS/CFT correspondence has vastly deepened our understanding of strongly coupled quantum systems and their connections with gravity. One of the most successful predictions of the AdS/CFT correspondence is that normal fluid has a lower bound 1/(4 \pi) in the shear viscosity to entropy density ratio, which has been rigorously tested in nuclear experiments at high temperatures. However, at low temperatures, quantum gravity effects should not be neglected. Inspired by the recent developments of 2d Jackiw-Teitelboim gravity, we introduce quantum gravity fluctuations in the near-horizon region of near-extremal RN black holes and study their consequences in the boundary dual fluid. Surprisingly, these new quantum corrections not only resolve some conceptual issues in the previous study of the fluid/gravity correspondence at low temperatures, but also lower the famous 1/(4 \pi) bound at certain temperatures. In this talk, we will discuss these aspects in detail. This talk is based on my recent papers 2510.15411 and 2510.21602 with collaborators.
About Speaker
Jun Nian is an assistant professor at the International Centre for Theoretical Physics Asia Pacific (ICTP-AP), University of Chinese Academy of Sciences. He received a Diplom degree from the University of Heidelberg in 2009 and a Ph.D. degree from Stony Brook University in 2015. Before joining ICTP-AP in 2021, he was a postdoctoral fellow at the Institut des Hautes Études Scientifiques (IHES) and at the University of Michigan. His research interests include quantum field theory, gravity theory, and string theory, with a recent focus on the quantum effects of black holes.
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