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(Jul. 19) Numerical Experiments on Electron-Positron Production Near Compact Astrophysical Objects

Last updated :2018-07-11

Topic: Numerical Experiments on Electron-Positron Production Near Compact Astrophysical Objects
Speaker: Dr. Yuran Chen Alexander
(Postdoctoral Reasearch Associate, Princeton University)
Invited by: Associate Professor Baixuan Tan
Time: 10:30 to 11:30, Thursday, July 19, 2018
Location: Room 107, Red House 17, Zhuhai Campus, SYSU

Abstract:
Near extreme astrophysical objects like neutron stars andblack holes, magnetic field evolution often requires dense plasma to conduct the required electric current. In the case when such plasma is not available, a small amount of seed particles can be accelerated to high energies and initiate a pair cascade, producing copious electrons and positrons in-situ. This mechanism is believed to be responsible for the emission from rotation-powered pulsars, the erratic X-ray bursts from magnetars, and providing the current in the jet funnel of low luminosity accreting supermassive black holes. I will talk about my first-principle numerical simulations on these systems and how they can help to solve some long-standing observational/theoretical problems in high energy astrophysics.