The mystery of Fast Radio Bursts, and its possible resolution

主讲人 (Speaker): Pawan Kumar

主讲人单位 (Speaker's Institute): University of Texas at Austin

邀请人 (Invited by): 申荣锋

时间 (Time): 星期三, 2018/06/27 - 15:00 to 16:00

地点 (Location): 珠海校区海滨红楼17栋107会议室

摘要 (Abstract):

Fast radio bursts (FRBs) are millisecond duration transient events of unknown physical origin that were discovered in pulsar surveys at GHz radio frequency in 2007. It has now been established that these bursts are located at a distance of several billion light years away. And therefore the energy release in the radio band in these events is quite large. Using very general arguments I will show that the radio emission is coherent, the magnetic field strength associated with the source of these events should be 10^{14}Gauss or more, and the electric field is of order 10^{11} esu. I will describe my recent work that magnetic reconnection is likely to be responsible for the strong electric field and the coherent radiation produced in these enigmatic events. I will also address polarization properties of the well known repeater.

主讲人简介 (Speaker's CV):

美国德克萨斯大学奥斯汀分校天文系教授（2002年起），理论天体物理学家。博士（1988）毕业于加州理工学院。曾任麻省理工学院助理教授（1992-1996）、普林斯顿高等研究院（IAS）访问教授（1996-2002）。在涉及致密星的高能天文暂现源（伽马射线暴、潮汐瓦解恒星事件、超新星）研究方面造诣深厚。早期曾从事Helioseismology研究。最近两年的研究兴趣集中于快速射电暴。已发表同行评议文章123篇。