报告题目：Reformulation of the Cosmological Constant Problem

报告时间：2021年3月26日（周五） 上午10:00-12:00

报告地点：仲英楼B249

报告人：王清涤 特聘研究员

报告摘要：The standard formulation of the cosmological constant problem is based on one critical assumption — the spacetime is homogeneous and isotropic, which is true only on cosmological scales. However, this problem is caused by extremely small scale quantum fluctuations and, at that scale, the spacetime is highly inhomogeneous and anisotropic. The homogeneous Friedmann-Lemaître-Robertson-Walker metric used in the standard formulation is inadequate to describe such small scale dynamics of the spacetime. We reformulate the cosmological constant problem by using a general inhomogeneous metric. The fine-tuning problem does not arise in the reformulation since the large gravitational effect of the quantum vacuum is hidden by small scale spacetime fluctuations. The stress energy tensor fluctuations of the quantum fields vacuum could serve as “dark energy” to drive the accelerating expansion of the Universe through a weak parametric resonance effect.

个人简介：王清涤，2008年6月获武汉大学数学与统计学院学士学位，2010年1月起师从理论物理学家William G. Unruh（英国皇家科学院院士，Unruh效应的发现者），于加拿大不列颠哥伦比亚大学（UBC）物理与天文系获硕士学位（2011.11）和博士学位（2018.07）。2018-2020年于不列颠哥伦比亚大学从事博士后研究工作。2021年3月加入西安交通大学澳门沙金官方网站，入选青年拔尖人才支持计划。主要研究方向为引力，量子引力，宇宙学，场论。