讲座题目：Post-Newtonian Celestial Dynamics in Cosmology

主 讲 人：Prof. Sergei Kopeikin
　　　　　　  Physics & Astronomy Department
　　　　　　  University of Missouri, Columbia, USA

讲座时间：2011年12月15日（周四）15:00

讲座地点：苏富特一楼会议室

讲座摘要：Post-Newtonian celestial dynamics is a relativistic theory of motion of massive bodies and test particles under the influence of relatively weak gravitational force. Standard approach for development of this theory relies upon the key concept of the isolated astronomical system and on the assumption that the background space-time is flat. The standard post-Newtonian theory was successful in explanation of the existing experimental data on binary pulsars, satellite and lunar laser ranging, and in building the precise ephemerides of planets in the solar system. Recent studies of the formation of large-scale structure in our universe indicate that the standard post-Newtonian mechanics fails to describe more subtle dynamical effects in motion of the bodies comprising the astronomical systems of larger size  - galaxies and clusters of galaxies - where the Riemann curvature of the expanding FLRW universe interacts with the local gravitational field of the astronomical system and, as such, can not be ignored.  This talk outlines the theoretical principles of the Lagrangian theory of cosmological perturbations caused by the isolated astronomical system consisting of N bodies. We consider the background FLRW universe governed by two primary components - the dark matter and the dark energy. We build the linearised equations to determine the post-Newtonian gravitational field of the astronomical system on the curved cosmological background of the universe, and discuss possible dynamical effects in evolution of the N-body astronomical system, implied by the solution of these equations.

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　　　　　　　　　　　　　　　　　　　　　　  南京大学天文与空间科学学院