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A New Secular Instability of Eccentric Stellar Disks Around Supermassive Black Holes, with Application to the Galactic Center
Ann-Marie Madigan, Yuri Levin, Clovis Hopman
We identify a new secular instability of eccentric stellar disks around supermassive black holes. We show that retrograde precession of the stellar orbits, due to the presence of a…
Evidence for Warped Disks of Young Stars in the Galactic Center
H. Bartko, F. Martins, T. K. Fritz +18
The central parsec around the super-massive black hole in the Galactic Center hosts more than 100 young and massive stars. Outside the central cusp (R~1") the majority of these O a…
On measuring the gravitational-wave background using Pulsar Timing Arrays
Rutger van Haasteren, Yuri Levin, Patrick McDonald +1
Long-term precise timing of Galactic millisecond pulsars holds great promise for measuring the long-period (months-to-years) astrophysical gravitational waves. Several gravitationa…
Hydromagnetic waves in a superfluid neutron star with strong vortex pinning
Maarten van Hoven, Yuri Levin
Neutron-star cores may be hosts of a unique mixture of a neutron superfluid and a proton superconductor. Compelling theoretical arguments have been presented over the years that if…
Evolution of the bursting-layer wave during a Type 1 X-ray burst
R. G. Berkhout, Yuri Levin
In a popular scenario due to Heyl, quasi periodic oscillations (QPOs) which are seen during type 1 X-ray bursts are produced by giant travelling waves in neutron-star oceans. Piro…
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…
Ejection of high-velocity stars from the Galactic Center by an inspiraling Intermediate-Mass Black Hole
Yuri Levin
The presence of young stars in the immediate vicinity and strong tidal field of SgrA* remains unexplained. One currently popular idea for their origin posits that the stars were bu…
Intermediate-mass Black Hole and stellar orbits in the Galactic Center
Yuri Levin, Alice S. P. Wu, Edward W. Thommes
Many young stars reside within the central half-parsec from SgrA*, the supermassive black hole in the Galactic Center. The origin of these stars remains a puzzle. Recently, Hansen…
Protostellar Disks: Formation, Fragmentation, and the Brown Dwarf Desert
Christopher D. Matzner, Yuri Levin
We argue that gravitational instability of typical protostellar disks is not a viable mechanism for the fragmentation into multiple systems -- binary stars, brown dwarf companions,…
Orbital roulette: a new method of gravity estimation from observed motions
Andrei M. Beloborodov, Yuri levin
The traditional way of estimating the gravitational field from observed motions of test objects is based on the virial relation between their kinetic and potential energy. We find…
Hydromagnetic and gravitomagnetic crust-core coupling in a precessing neutron star
Yuri Levin, Caroline D'Angelo
We consider two types of mechanical coupling between the crust and the core of a precessing neutron star. First, we find that a hydromagnetic (MHD) coupling between the crust and t…
Formation of massive stars and black holes in self-gravitating AGN discs, and gravitational waves in LISA band
Yuri Levin
We propose a scenario in which massive stars form at the outer edges of an AGN accretion disc. We analyze the dynamics of a disc forming around a supermassive black hole, in which…
Stellar disk in the galactic center -- a remnant of a dense accretion disk?
Yuri Levin, Andrei M. Beloborodov
Observations of the galactic center revealed a population of young massive stars within 0.4 pc from Sgr A* -- the presumed location of a supermassive black hole. The origin of thes…
Crust-core coupling and r-mode damping in neutron stars: a toy model
Yuri Levin, Greg Ushomirsky
R-modes in neutron stars with crusts are damped by viscous friction at the crust-core boundary. The magnitude of this damping, evaluated by Bildsten and Ushomirsky (BU) under the a…
Nonlinear r-modes in a spherical shell: issues of principle
Yuri Levin, Greg Ushomirsky
We use a simple physical model to study the nonlinear behaviour of the r-mode instability. We assume that r-modes (Rossby waves) are excited in a thin spherical shell of rotating i…
Runaway Heating By R-modes of Neutron Stars in Low Mass X-ray Binaries
Yuri Levin
Recently Andersson et. al., and Bildsten have independently suggested that an r-mode instability might be responsible for stalling the neutron-star spin-up in strongly accreting, L…