题　   目：Gravitational Waves and their detection: Laser-interferometers on Earth

报 告 人：Dr. Albrecht Rüdiger (Max-Planck-Institut für Gravitationsphysik (Albert-Einstein-Institut), Germany)

报告摘要：Gravitational waves are a consequence of Einstein’s General Theory of Relativity.  Time-derivatives of the mass quadrupole moment of celestial bodies are the source of such waves.  The waves induce tiny strains in space-time, typically of the order 10^{-21} or less. Michelson-type interferometers with arm-lengths in the km range have been constructed to detect such waves, yet without measuring any events.

Therefore, a second generation of such antennas is under construction, with increased sensitivities.  The technologies being pursued are discussed that lead to the desired improvements.

时　　  间：2011年5月31日（星期二）下午14:30

地　　  点：紫台大楼327室

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