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时间:2017-06-14 来源:未知 点击:
报告题目:Relativistic Geodesy
报  告  人:Prof.
 Dr. Sergei M. Kopeikin,University of Missouri-Columbia 
邀  请  人:申文斌 教授
报告时间:2017年6月16日上午10:00 - 11:40

Modern geodesy is going through a drastic change from the paradigm of the Newtonian gravity to Einstein's theory of general relativity. This transformation is due to the rapid growth in the accuracy of gravitational field measurement caused by the implementation of various types of quantum sensors, atomic clocks, fiber optic links and satellite gradientometry which altogether improved significantly our capability to build much more precise geodetic reference frame, geoid and the world height system. Advances in geodetic measurements demand deeper development of the theoretical basis of geodesy to incorporate various relativistic concepts to the definitions of geoid, reference ellipsoid, normal gravity field, the gravitational filed anomaly, etc. This talk will discuss a number of topics such as the relativistic geoid, reference-ellipsoid, normal gravity field, the applicability of the exact solutions of Einstein’s equations to geodesy, etc. We shall also discuss a recent experimental progress in establishing the new field of relativistic geodesy with atomic clocks – a chronometric geodesy.

Sergei Kopeikin (born April 10, 1956) is a USSR-born theoretical physicist presently living and working in the United States, where he holds the position of Professor of Physics at the University of Missouri in Columbia, Missouri. He specializes in the theoretical and experimental study of gravity and general relativity. He is also an expert in the field of the astronomical reference frames and time metrology. His general relativistic theory of the Post-Newtonian reference frames which he had worked out along with Victor A. Brumberg, was adopted in 2000 by the resolutions of the International Astronomical Union as a standard for reduction of ground-based astronomical observation. In September 2002 he led a team which conducted a high-precision VLBI experiment to measure the fundamental speed of gravity. He is also involved in studies concerning the capabilities of the Lunar Laser Ranging (LLR) technique to measure dynamical features of the General Theory of Relativity in the lunar motion. He has recently criticized the claims of other scientists concerning the possibility of LLR to measure the gravitomagnetic interaction. Prof. Kopeikin organized and chaired three international workshops on the advanced theory and model of the Lunar Laser Ranging experiment. The LLR workshops were held in the International Space Science Institute (Bern, Switzerland) in 2010-2012.