Past Colloquia
Magnetized Stars from Normal to Supermassive Ones

SHAO Astrophysics Colloquium

Title: Magnetized Stars from Normal to Supermassive Ones

Time: 3:30pm, Sep. 30th (Thursday)

Speaker:  YU-QING LOU  楼宇庆

Institution: Tsinghua University, Physics Department, Tsinghua Center for Astrophysics, Astronomy Department, and Tsinghua--National Astronomical Observatories of China joint Research Center for Astrophysics


In the framework of general relativity (GR), we investigate magnetized normal to supermassive stars in quasi spherical equilibrium and radial pulsational GR magnetohydrodynamic (MHD) stability/instability problems. In our stellar model, a random transverse magnetic field is presumed and a key relation for magnetic flux conservation is stipulated. We identify distinct features and pertinent physical effects for magnetized and non-magnetic stars. In particular, GR MHD collapses of magnetized massive stars can give rise to black holes (BHs) in a very broad mass range and can certainly avoid the electron-positron pair instabilities to form BHs in the so-called "forbbiden zone of BH masses". This closely relates to the recent inferences of LIGO/Virgo experiments on binary BH masses. We briefly discuss the dynamic or MHD formation of supermassive BHs and hypermassive BHs.


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