Electromagnetic partner of the gravitational signal during accretion onto black holes

Degollado, Juan Carlos; Estrada, Víctor Hugo Gualajara; Moreno, Claudia; Núñez, Darío

doi:10.1007/s10714-014-1819-7

Cited by 6 publications

(10 citation statements)

References 32 publications

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“…[40] and references therein for an efficient formalism for describing such perturbations). For a related recent study on gravitational waves triggered by a non-spherical dust cloud which is accreted by a Schwarzschild black hole, see [41]. However, in the scenario discussed in this article it does not seem that the amount of gravitational radiation will be significant since (i) we only consider small departures of a spherically symmetric flow and (ii) because the characteristic frequencies associated with the acoustic perturbations are so much smaller than the characteristic frequencies of the accreting black hole.…”

Section: Discussionmentioning

confidence: 99%

Quasi-normal acoustic oscillations in the transonic Bondi flow

Chaverra

Sarbach

2015

Gen Relativ Gravit

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In recent work, we analyzed the dynamics of spherical and nonspherical acoustic perturbations of the Michel flow, describing the steady radial accretion of a relativistic perfect fluid into a nonrotating black hole. We showed that such perturbations undergo quasi-normal oscillations and computed the corresponding complex frequencies as a function of the black hole mass M and the radius r_c of the sonic horizon. It was found that when r_c is much larger than the Schwarzschild radius r_H = 2GM/c^2 of the black hole, these frequencies scale like the surface gravity of the analogue black hole associated with the acoustic metric. In this work, we analyze the Newtonian limit of the Michel solution and its acoustic perturbations. In this limit, the flow outside the sonic horizon reduces to the transonic Bondi flow, and the acoustic metric reduces to the one introduced by Unruh in the context of experimental black hole evaporation. We show that for the transonic Bondi flow, Unruh's acoustic metric describes an analogue black hole and compute the associated quasi-normal frequencies. We prove that they do indeed scale like the surface gravity of the acoustic black hole, thus providing an explanation for our previous results in the relativistic setting.Comment: 18 pages, 3 figure

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Section: Discussionmentioning

confidence: 99%

Quasi-normal acoustic oscillations in the transonic Bondi flow

Chaverra

Sarbach

2015

Gen Relativ Gravit

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“…The details of the implementation and the description of the code can be found in Ref. 4. In all the simulations presented here we use as initial data a Gaussian shell in the density and look for the gravitational and electromagnetic signals with ρ 0 = 5×10 −3 , r cg = 100M and σ = 0.5M .…”

Section: Numerical Resultsmentioning

confidence: 99%

Electromagnetic and gravitational signatures of accretion into black holes

Degollado

2015

Int. J. Mod. Phys. D

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In this paper, the gravitational and electromagnetic signals due to accretion of charged fluids into a Schwarzschild black hole is revisited. We set up the perturbed Einstein equations and Maxwell equations coupled to the fluid equations on a stationary black hole as a system of differential equations that can be integrated as an initial value problem. We numerically investigate cases in which we varied the properties of the fluid. Our scenario may provide an electromagnetic counterpart to gravitational waves in many situations of interest, enabling easier extraction and verification of gravitational waveforms from gravitational wave detection. We find that the features of the resulting electromagnetic signals depend on the properties and dynamics of the flow. Int. J. Mod. Phys. D 2015.24. Downloaded from www.worldscientific.com by THE UNIVERSITY OF NEW SOUTH WALES on 08/12/15. For personal use only. 1542004-2 Int. J. Mod. Phys. D 2015.24. Downloaded from www.worldscientific.com by THE UNIVERSITY OF NEW SOUTH WALES on 08/12/15. For personal use only.

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“…Indeed, the partial waveforms (14) as integrals over the radial Schwarzschild coordinate are divergent at infinity. This is due to the behavior of the source (13) for r → ∞.…”

Section: Regularization Of the Partial Waveform Amplitudes ψ ωLm Amentioning

confidence: 99%

“…[10][11][12]). In this context, it is particularly interesting to study the electromagnetic partner of the gravitational radiation generated during the accretion of a charged fluid by a BH [13,14].…”

Section: Introductionmentioning

confidence: 99%