报告题目:  NONSINGULARBOUNCING COSMOLOGY IN GENERAL RELATIVITY.

报告人: Emmanuele Battista, Institute for Theoretical Physics(ITP), Karlsruhe Institute of Technology (KIT)

报告时间: 2021年3月5日下午4点

报告地点: 伟德BETVlCTOR1946前卫校区物理楼302，在线报告 (online)  https://cern.zoom.us/j/61689351926?pwd=M0FOZUpRME1RYUYxeWMvRyszbUQ1Zz09

报告摘要： Spacetimedefect has been recently proposed in the literature as a tool to tame thebig-bang singularity. Such anobject can be described by a degenerate metric with a vanishing determinant ona 3-dimensional submanifold of the spacetime and a nonzero length scale b,which acts as a “regulator" of the Friedmann singularity. This new metrichas been called the regularized-big-bang metric and it gives rise to anonsingular spatially flat Friedmann-type solution of the Einsteingravitational field equation which allows for a “pre-big-bang" phase witha bounce-type behavior of the cosmic scale factor. In this talk, I willdescribe some features underlying this regularized geometry. In particular, Iwill discuss the physical effects pointing out the presence of the defect inthe regularized Robertson-Walker spacetime by considering two main physicalquantities: the compressive forces acting on (human) observers and the energypossessed by massive particles and photons during their dynamical evolution.

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