EXCITING WAVES AND MODES IN BLACK-HOLE ACCRETION DISKS AND OTHER ASTROPHYSICAL ROTATING FLOWS
Dong LAI
Cornell University
Lundi 21/06/2010, 11:00
Bat 709, salle 3 (salle Cassini, Rdc), CEA Saclay, Orme des Merisiers

I will review recent works on the wave dynamics of black-hole accretion disks, focusing on global disk instabilities and wave modes trapped in the inner disk region. I will explain the role of wave super-reflection and wave absorption at the corotation resonance,as well as how general relativistic effects may help to drive these modes unstable. The effects of disk magnetic field will be emphasized.

 

Applications to the quasi-periodic oscillations observed in accreting black hole systems will also be discussed.  Similar physics are also important for other astrophysical problems involving rotating flows, such as the rotational instability in young neutron stars and planet migration in magnetized disks.

 

Contact : Pascale CHAVEGRAND

 

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