Zobrazeno 1 - 10
of 300
pro vyhledávání: '"Balbus, Steven"'
Autor:
Balbus, Steven A.
We show by direct calculation that the common Equivalence Principle explanation for why gravity must deflect light is quantitatively incorrect by a factor of three in Schwarzschild geometry. It is therefore possible, at least as a matter of principle
Externí odkaz:
http://arxiv.org/abs/2403.03965
Accretion flows are fundamentally turbulent systems, yet are classically modelled with viscous theories only valid on length scales significantly greater than the typical size of turbulent eddies in the flow. We demonstrate that, while this will be a
Externí odkaz:
http://arxiv.org/abs/2402.05561
Autor:
Mummery, Andrew, van Velzen, Sjoert, Nathan, Edward, Ingram, Adam, Hammerstein, Erica, Fraser-Taliente, Ludovic, Balbus, Steven
We present fundamental scaling relationships between properties of the optical/UV light curves of tidal disruption events (TDEs) and the mass of the black hole that disrupted the star. We have uncovered these relations from the late-time emission of
Externí odkaz:
http://arxiv.org/abs/2308.08255
Autor:
Mummery, Andrew, Balbus, Steven
We present analytical solutions for the thermodynamic (temperature, pressure, density, etc.) properties of thin accretion flows in the region within the innermost stable circular orbit (ISCO) of a Kerr black hole, the first analytical solutions of th
Externí odkaz:
http://arxiv.org/abs/2302.14437
Autor:
Mummery, Andrew, Balbus, Steven
We present analytical solutions describing a family of both inwardly and outwardly spiralling orbits in the Kerr spacetime. The solutions are exact, and remarkable for their simplicity. These orbits all have the angular momentum and energy of a circu
Externí odkaz:
http://arxiv.org/abs/2302.01159
Autor:
Mummery, Andrew, Balbus, Steven
The probability density function of accretion disc luminosity fluctuations at high observed energies (i.e., energies larger than the peak temperature scale of the disc) is derived, under the assumption that the temperature fluctuations are log-normal
Externí odkaz:
http://arxiv.org/abs/2210.01450
Autor:
Mummery, Andrew, Balbus, Steven
We present exact solutions of test particle orbits spiralling inward from the innermost stable circular orbit (ISCO) of a Kerr black hole. Our results are valid for any allowed value of the angular momentum $a$-parameter of the Kerr metric. These sol
Externí odkaz:
http://arxiv.org/abs/2209.03579
Autor:
Balbus, Steven A.
A very simple and physical derivation of the conservation equation for the propagation of gravitational radiation is presented. The formulation is exact. The result takes the readily recognisable and intuitive form of a Poynting-style equation, in wh
Externí odkaz:
http://arxiv.org/abs/2109.04163
Autor:
Mummery, Andrew, Balbus, Steven
We extend the relativistic time-dependent thin-disc TDE model to describe nonthermal ($2-10$ keV) X-ray emission produced by the Compton up-scattering of thermal disc photons by a compact electron corona, developing analytical and numerical models of
Externí odkaz:
http://arxiv.org/abs/2104.06195
Autor:
Mummery, Andrew, Balbus, Steven
We comprehensively model the X-ray luminosity emergent from time dependent relativistic accretion discs, developing analytical models of the X-ray luminosity of thermal disc systems as a function of black hole mass $M$, disc mass $M_d$, and disc $\al
Externí odkaz:
http://arxiv.org/abs/2104.06177