Quasinormal modes and Regge poles of the canonical acoustic hole

Dolan, Sam R.; Oliveira, Leandro A.; Crispino, Luís C. B.

doi:10.1103/physrevd.82.084037

Cited by 28 publications

(27 citation statements)

References 70 publications

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“…For previous studies of quasi-normal oscillations in fluid analogue black hole modes, see for example Refs. [14,20,21]. Contrary to these references which are mainly concerned with analogue black holes in the laboratory, the scenario considered in this article refers to an astrophysical analogue black hole.…”

Section: Introductionmentioning

confidence: 89%

Quasinormal acoustic oscillations in the Michel flow

2015

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We study spherical and nonspherical linear acoustic perturbations of the Michel flow, which describes the steady radial accretion of a perfect fluid into a nonrotating black hole. The dynamics of such perturbations are governed by a scalar wave equation on an effective curved background geometry determined by the acoustic metric, which is constructed from the spacetime metric and the particle density and four-velocity of the fluid. For the problem under consideration in this article the acoustic metric has the same qualitative features as an asymptotically flat, static and spherically symmetric black hole, and thus it represents a natural astrophysical analogue black hole.As for the case of a scalar field propagating on a Schwarzschild background, we show that acoustic perturbations of the Michel flow exhibit quasi-normal oscillations. Based on a new numerical method for determining the solutions of the radial mode equation, we compute the associated frequencies and analyze their dependency on the mass of the black hole, the radius of the sonic horizon and the angular momentum number. Our results for the fundamental frequencies are compared to those obtained from an independent numerical Cauchy evolution, finding good agreement between the two approaches. When the radius of the sonic horizon is large compared to the event horizon radius, we find that the quasi-normal frequencies scale approximately like the surface gravity associated with the sonic horizon.

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Section: Introductionmentioning

confidence: 89%

Quasinormal acoustic oscillations in the Michel flow

2015

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“…The numerical methods employed in this problem are based on the shooting method, which is also called the direct integration (DI) method [31][32][33][34]. It is shown that the DI method is specially suited to find a stationary field configuration with the mirror-like boundary condition.…”

Section: Numerical Procedures and Resultsmentioning

confidence: 99%

Scalar clouds in charged stringy black hole-mirror system

Zhao

et al. 2015

Eur. Phys. J. C

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It was reported that massive scalar fields can form bound states around Kerr black holes (Herdeiro and Radu, Phys. Rev. Lett. 112:221101, 2014). These bound states are called scalar clouds; they have a real frequency ω = m H , where m is the azimuthal index and H is the horizon angular velocity of Kerr black hole. In this paper, we study scalar clouds in a spherically symmetric background, i.e. charged stringy black holes, with the mirror-like boundary condition. These bound states satisfy the superradiant critical frequency condition ω = q H for a charged scalar field, where q is the charge of the scalar field, and H is the horizon's electrostatic potential. We show that, for the specific set of black hole and scalar field parameters, the clouds are only possible for specific mirror locations r m . It is shown that analytical results of the mirror location r m for the clouds perfectly coincide with numerical results in the q Q 1 regime. We also show that the scalar clouds are also possible when the mirror locations are close to the horizon. Finally, we provide an analytical calculation of the specific mirror locations r m for the scalar clouds in the q Q 1 regime.

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“…It is therefore of interest to understand if a given property observed in BH spacetimes can be mimicked by analogue models. Within this context, BH properties like absorption [4,5], scattering [6,7], quasinormal modes, and Regge poles [8][9][10][11][12] have been investigated in acoustic analogue spacetimes over the past few years.…”

Section: Introductionmentioning

confidence: 99%

Acoustic clouds: Standing sound waves around a black hole analogue

et al. 2015

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Under certain conditions sound waves in fluids experience an acoustic horizon with analogue properties to those of a black hole event horizon. In particular, a draining bathtub-like model can give rise to a rotating acoustic horizon and hence a rotating black hole (acoustic) analogue. We show that sound waves, when enclosed in a cylindrical cavity, can form stationary waves around such rotating acoustic holes. These acoustic perturbations display similar properties to the scalar clouds that have been studied around Kerr and Kerr-Newman black holes; thus they are dubbed acoustic clouds. We make the comparison between scalar clouds around Kerr black holes and acoustic clouds around the draining bathtub explicit by studying also the properties of scalar clouds around Kerr black holes enclosed in a cavity. Acoustic clouds suggest the possibility of testing, experimentally, the existence and properties of black hole clouds, using analog models.

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Quasinormal modes and Regge poles of the canonical acoustic hole

Cited by 28 publications

References 70 publications

Quasinormal acoustic oscillations in the Michel flow

Quasinormal acoustic oscillations in the Michel flow

Scalar clouds in charged stringy black hole-mirror system

Acoustic clouds: Standing sound waves around a black hole analogue

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