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学术报告(20170628)Tight constraint on photon mass from pulsar spin down
发布时间:2017-06-26

 

报告题目: Tight constraint on photon mass from pulsar spin down
报告人: 杨元培
报告人单位: 北京大学
报告时间: 2017年6月28日 上午10:30
报告地点: 引力中心三楼会议室
报告人简介:  
  Kavli Institute of Astronomy and Astrophysics, Peking University, KIAA-CAS Fellow, 2016-
School of Astronomy and Space Science, Nanjing University, Ph.D. Program, 2016
Department of Physics & Astronomy, University of Nevada, Las Vegas, Visiting Student, 2015
School of Astronomy and Space Science, Nanjing University, M.S. Program, 2013
School of Astronomy and Space Science, Nanjing University, B.A. 2011
报告摘要:  
  Pulsars are magnetized rotating compact objects. They spin down due to magnetic dipole radiation and wind emission. If photon has a nonzero mass, the spin down rate would be smaller than the zero mass case. We show that an upper limit of the photon mass, i.e. m_\gamma< h/Pc2, may be placed if a pulsar with period P is observed to spin down. Recently, a white dwarf (WD) --- M dwarf binary, AR Scorpii was discovered to emit pulsed broadband emission with pulses. The spin-down luminosity of the WD can comfortably power the non-thermal radiation from the system. Applying our results to the WD pulsar with P=117 s, we obtain a stringent upper limit of the photon mass between m_\gamma<6.3*10-50g assuming a vacuum dipole spindown, and m_\gamma<9.6*10-50g assuming a spindown due to a fully developed pulsar wind.

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