| 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： |
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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： |
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| |
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. |
