Gravitational Waves from Disks Around Spinning Black Holes: Simulations in Full General Relativity

Abstract

We present fully general-relativistic numerical evolutions of self-gravitating tori around spinning black holes with dimensionless spin $a/M=0.7$ parallel or anti-parallel to the disk angular momentum. The initial disks are unstable to the hydrodynamic Papaloizou-Pringle Instability which causes them to grow persistent orbiting matter clumps. The effect of black hole spin on the growth and saturation of the instability is assessed. We find that the instability behaves similarly to prior simulations with non-spinning black holes, with a shift in frequency due to spin-induced changes in disk orbital period. Copious gravitational waves are generated by these systems, and we analyze their detectability by current and future gravitational wave observatories for large range of masses. We find that systems of $10M_{\odot }$ - relevant for black hole-neutron star mergers - are detectable by Cosmic Explorer out to $\sim 300$ Mpc, while DECIGO (LISA) will be able to detect systems of $1000M_{\odot }$ ($10^5{M}_{\odot }$) - relevant for disks forming in collapsing supermassive stars - out to cosmological redshift of $z\sim 5$ ($z\sim 1$). Computing the accretion rate of these systems we find that these systems may also be promising sources of coincident electromagnetic signals.

arXiv comment15 pages, 12 figures

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