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发布时间:2014-04-18          来源:陆泽晃           浏览次数:
 2014416日晚上19:45澳大利亚CSIRO的Manchester院士在引力中心三楼会议室为全体师生作了题为“Pulsars and Gravity”的报告。


Pulsars are extraordinarily good clocks. This property has been exploited in a wide range of applications ranging from studying the interiors of neutron stars to testing theories of gravitation. Many pulsars, especially millisecond pulsars, are in orbit around another star, providing a near-ideal gravitational laboratory. Double-neutron-star systems such as the Double Pulsar provide the most stringent tests of gravitational theories in strong-field environments. A Pulsar Timing Array (PTA) can in principle give a direct detection of GWs at nanohertz frequencies. A secondary goal of PTA projects is the establishment of a “pulsar timescale” which, over long time intervals, may be more accurate than the best available timescales based on atomic clocks. Since mid-2004, the Parkes Pulsar Timing Array (PPTA) project has been making regular timing measurements of 20 millisecond pulsars with steadily improving precision. While we do not yet have a significant GW detection, our current upper limit seriously constrains standard models for galaxy evolution and formation of super-massive black holes in galaxy cores. In collaboration with the European and North American PTAs we have formed the International Pulsar Timing Array (IPTA) to enhance progress toward PTA goals.


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