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(PDF) Advances in Stochastic Gravity: Stress-energy Fluctuations in the Early Universe and Backreaction of Hawking Radiation in Black Holes
2012-06-04  【 】【打印】【关闭
Institute of Theoretical Physics
Chinese Academy of Sciences
学术报告
Title
题目
Advances in Stochastic Gravity: Stress-energy Fluctuations in the Early Universe and Backreaction of Hawking Radiation in Black Holes
Speaker
报告人
Prof. B. L. Hu(胡悲乐)
Maryland Center for Fundamental Physics, University of Maryland, College Park, USA
Date
日期
2012-06-04 AM 10:00 Monday
Venue
地点
Conference Hall 322, ITP/理论物理所322报告厅
Abstract
摘要

Semiclassical gravity (SCG) theory provides a self-consistent description of spacetime dynamics and quantum matter fields through the expectation values of their quantum stress energy tensors. When their fluctuations become large, as could happen in the early universe or late stages of black hole collapse, SCGmay fail to provide an accurate description.The proper framework to address issues involving the dynamics of fluctuations in the matter field and in the metric tensor consistently is stochastic gravity . The fluctuations in the matter field is contained in the noise kernel which is the expectation value of the stress energy bi-tensor acting as a source for the Einstein-Langevin equation, from which one can obtain the induced metric fluctuations in the background spacetime. Stochastic gravity program is currently investigated for metric fluctuations and backreaction in evaporating black holes and cosmological structure formation. We describe recent results in the calculations of the noise kernels of conformally-invariant scalar fields in spacetimes conformal to an ultrastatic spacetime (under quasilocal approximation), in static de Sitter and all conformally-flat spacetimes (exact expressions) as well as for massive quantum scalar field with general coupling in Euclidean R^N and AdS^N spaces via the generalized zeta-function method.

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