Zobrazeno 1 - 10
of 173
pro vyhledávání: '"Abhay G"'
Publikováno v:
Current Science, 2020 Jan 01. 118(1), 34-39.
Externí odkaz:
https://www.jstor.org/stable/27138633
We study perturbations of Schwarzschild spacetime in a coordinate-free, covariant form. The GHP formulation, having the advantage of not only being covariant but also tetrad-rotation invariant, is used to write down the previously known odd- and even
Externí odkaz:
http://arxiv.org/abs/1611.08291
Autor:
Nagar, Alessandro, Shah, Abhay G.
Publikováno v:
Phys. Rev. D 94, 104017 (2016)
We introduce a new, resummed, analytical form of the post-Newtonian (PN), factorized, multipolar amplitude corrections $f_{\ell m}$ of the effective-one-body (EOB) gravitational waveform of spinning, nonprecessing, circularized, coalescing black hole
Externí odkaz:
http://arxiv.org/abs/1606.00207
It is known that a near-extremal Kerr black hole can be spun up beyond its extremal limit by capturing a test particle. Here we show that overspinning is always averted once back-reaction from the particle's own gravity is properly taken into account
Externí odkaz:
http://arxiv.org/abs/1508.04031
Autor:
van de Meent, Maarten, Shah, Abhay G.
Publikováno v:
Phys. Rev. D 92, 064025 (2015)
We present the first numerical calculation of the (local) metric perturbation produced by a small compact object moving on an eccentric equatorial geodesic around a Kerr black hole, accurate to first order in the mass ratio. The procedure starts by f
Externí odkaz:
http://arxiv.org/abs/1506.04755
Autor:
Shah, Abhay G., Pound, Adam
Publikováno v:
Phys. Rev. D 91, 124022 (2015)
Using black hole perturbation theory and arbitrary-precision computer algebra, we obtain the post-Newtonian (pN) expansions of the linear-in-mass-ratio corrections to the spin-precession angle and tidal invariants for a particle in circular orbit aro
Externí odkaz:
http://arxiv.org/abs/1503.02414
Autor:
Shah, Abhay G., Whiting, Bernard F.
Publikováno v:
General Relativity and Gravitation 2016, 48:78
In this paper we generalize the spin-raising and lowering operators of spin-weighted spherical harmonics to linear-in-$\gamma$ spin-weighted spheroidal harmonics where $\gamma$ is an additional parameter present in the second order ordinary different
Externí odkaz:
http://arxiv.org/abs/1503.02618
Publikováno v:
Phys. Rev. D 92, 044007 (2015)
It is now possible to compute linear in mass-ratio terms in the post-Newtonian (PN) expansion for compact binaries to very high orders using black hole perturbation theory applied to various invariants. For instance, a computation of the redshift inv
Externí odkaz:
http://arxiv.org/abs/1503.02638
Autor:
Merlin, Cesar, Shah, Abhay G.
Publikováno v:
Phys. Rev. D 91, 024005 (2015)
We present a first numerical implementation of a new scheme by Pound et al. that enables the calculation of the gravitational self-force in Kerr spacetime from a reconstructed metric-perturbation in a radiation gauge. The numerical task of the metric
Externí odkaz:
http://arxiv.org/abs/1410.2998
Autor:
Isoyama, Soichiro, Barack, Leor, Dolan, Sam R., Tiec, Alexandre Le, Nakano, Hiroyuki, Shah, Abhay G., Tanaka, Takahiro, Warburton, Niels
Publikováno v:
Phys. Rev. Lett. 113, 161101 (2014)
For a self-gravitating particle of mass \mu in orbit around a Kerr black hole of mass M >> \mu, we compute the O(\mu/M) shift in the frequency of the innermost stable circular equatorial orbit (ISCEO) due to the conservative piece of the gravitationa
Externí odkaz:
http://arxiv.org/abs/1404.6133