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On the theory of magnetar QPOs
Yuri Levin
We consider torsional oscillations of magnetars. This problem features rich dynamics due to the strong interaction between the normal modes of a magnetar's crust and a continuum of…
Starbursts near supermassive black holes: young stars in the Galactic Center, and gravitational waves in LISA band
Yuri Levin
We propose a scenario in which massive stars form in a self-gravitating gaseous disc around a supermassive black hole. We find that once the surface density of the disc exceeds a c…
The Two Young Star Disks in the Central Parsec of the Galaxy: Properties, Dynamics and Formation
T. Paumard, R. Genzel, F. Martins +11
We report the definite spectroscopic identification of 41 OB supergiants, giants and main sequence stars in the central parsec of the Galaxy. Detection of their absorption lines ha…
QPOs during magnetar flares are not driven by mechanical normal modes of the crust
Yuri Levin
Quasi-Periodic Oscillations (QPOs) have been observed during three powerful magnetar flares, from SGR0526-66, SGR1806-20 and SGR1900+14. These QPOs have been commonly interpreted a…
Clockwise Stellar Disk and the Dark Mass in the Galactic Center
A. M. Beloborodov, Y. Levin, F. Eisenhauer +4
Two disks of young stars have recently been discovered in the Galactic Center. The disks are rotating in the gravitational field of the central black hole at radii r=0.1-0.3 pc and…