Is super-Planckian physics visible? Scattering of black holes in 5 dimensions

Okawa, Hirotada; Nakao, Ken Ichi; Shibata, Masaru

doi:10.1103/physrevd.83.121501

Cited by 54 publications

(74 citation statements)

References 29 publications

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“…It is possible that tidal effects already play a role in the numerical simulations of the kind recently reported in Refs. [13,31,32], but further study is necessary. One of the consequences of our results for those type of simulations is, for instance, that in higher dimensional BH collisions the amount of gravitational radiation accretion might play an important role.…”

Section: Discussionmentioning

confidence: 99%

Tidal effects around higher-dimensional black holes

Brito¹,

Cardoso

Pani³

2012

Phys. Rev. D

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In four-dimensional spacetime, moons around black holes generate low-amplitude tides, and the energy extracted from the hole's rotation is always smaller than the gravitational radiation lost to infinity. Thus, moons orbiting a black hole inspiral and eventually merge. However, it has been conjectured that in higher-dimensional spacetimes orbiting bodies generate much stronger tides, which backreact by tidally accelerating the body outwards. This effect, analogous to the tidal acceleration experienced by the Earth-Moon system, would determine the evolution of the binary. Here, we put this conjecture to the test, by studying matter coupled to a massless scalar field in orbit around a singly-spinning rotating black hole in higher dimensions. We show that in dimensions larger than five the energy extracted from the black hole through superradiance is larger than the energy carried out to infinity. Our numerical results are in excellent agreement with analytic approximations and lend strong support to the conjecture that tidal acceleration is the rule, rather than the exception, in higher dimensions. Superradiance dominates the energy budget and moons "outspiral"; for some particular orbital frequency, the energy extracted at the horizon equals the energy emitted to infinity and "floating orbits" generically occur. We give an interpretation of this phenomenon in terms of the membrane paradigm and of tidal acceleration due to energy dissipation across the horizon.

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Section: Discussionmentioning

confidence: 99%

Tidal effects around higher-dimensional black holes

Brito¹,

Cardoso

Pani³

2012

Phys. Rev. D

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“…In fact, numerical relativity in higher dimensions is a very recent field (see eg. [27][28][29][30][31][32][33] for general formulations with applications). Here we are interested in spherically symmetric black holes, perturbed in such a way that this symmetry is preserved.…”

Section: Ansatz With Spherical Symmetry In Double Null Coordinatesmentioning

confidence: 99%

Mass inflation in aD-dimensional Reissner-Nordström black hole: A hierarchy of particle accelerators?

et al. 2011

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We study the geometry inside the event horizon of perturbed D dimensional Reissner-Nordström-(A)dS type black holes showing that, similarly to the four dimensional case, mass inflation also occurs for D > 4. First, using the homogeneous approximation, we show that an increase of the number of spatial dimensions contributes to a steeper variation of the metric coefficients with the areal radius and that the phenomenon is insensitive to the cosmological constant in leading order. Then, using the code reported in [1] adapted to D dimensions, we perform fully non-linear numerical simulations. We perturb the black hole with a compact pulse adapting the pulse amplitude such that the relative variation of the black hole mass is the same in all dimensions, and determine how the black hole interior evolves under the perturbation. We qualitatively confirm that the phenomenon is similar to four dimensions as well as the behaviour observed in the homogeneous approximation. We speculate about the formation of black holes inside black holes triggered by mass inflation, and about possible consequences of this scenario.

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“…Again, perturbative techniques point in the same direction [101,124]. As a final remark, zoom-whirl behavior seems to be intrinsic to, or at least more colourful in, four-dimensional spacetimes [125]. …”

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confidence: 99%

Black hole bombs and explosions: from astrophysics to particle physics

Cardoso

2013

Gen Relativ Gravit

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Black holes are the elementary particles of gravity, the final state of sufficiently massive stars and of energetic collisions. With a forty-year long history, black hole physics is a fully-blossomed field which promises to embrace several branches of theoretical physics. Here I review the main developments in highly dynamical black holes with an emphasis on high energy black hole collisions and probes of particle physics via superradiance. This write-up, rather than being a collection of well known results, is intended to highlight open issues and the most intriguing results.Keywords Black holes · Superradiance · Cosmic Censorship · Transplanckian collisions IntroductionThe Kerr-Newman family of black holes in stationary four-dimensional, asymptotically flat spacetimes exhausts all possible electro-vacuum solutions in General Relativity. Theoretical aspects of black hole physics were fully developed decades ago, when the Kerr-Newman family was discovered and characterized. Most of the tools to understand black hole physics have been in place since that period and most processes involving black holes were controlled at the order-of-magnitude level for at least two decades. Perhaps due to these reasons, "black hole physics" conjures up images of horizons and time-warps and old-fashioned, frozen-in-time topics to lay audiences. However, in the last years the activity in the field is bubbling up Vitor Cardoso CENTRA, Departamento de Física, Instituto Superior Técnico, Universidade Técnica de Lisboa -UTL, Av. Rovisco Pais 1, 1049 Lisboa, Portugal E-mail: vitor.cardoso@ist.utl.pt Present address: Perimeter Institute for Theoretical Physics, Waterloo, Ontario N2J 2W9, Canada 2 Vitor Cardoso and the interest in these issues has widened, driven by several unrelated events at the observational/instrumental, technical and conceptual levels such as (i) our capacity to observationally scrutinize the region close to the horizon within a few Schwarzschild radii, with radio and deep infrared interferometry, of which we have seen but the first steps [1,2,3,4];(ii) the ability to measure black hole spins more accurately than ever before using X-ray spectroscopy [5,6] or "continuum-fitting" methods [7]. Measurement of black hole mass and spin is one necessary step in testing General Relativity [8]; (iii) huge technological progress in gravitational-wave observatories, some of which had been gathering data at design sensitivities for several years and are now being upgraded to sensitivities one order of magnitude higher (black hole binaries are thought to be among the first objects to ever be detected in the gravitational-wave spectrum);(iv) our ability to numerically evolve black hole binaries at the full nonlinear level [9,10,11] and its immediate importance for gravitational-wave searches and high-energy physics [12]; (v) improvement of perturbative schemes, either by an understanding of regularization schemes to handle the self-force [13,14], or by faster and more powerful methods to deal with the full ladder of pe...

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Is super-Planckian physics visible? Scattering of black holes in 5 dimensions

Cited by 54 publications

References 29 publications

Tidal effects around higher-dimensional black holes

Tidal effects around higher-dimensional black holes

Mass inflation in aD-dimensional Reissner-Nordström black hole: A hierarchy of particle accelerators?

Black hole bombs and explosions: from astrophysics to particle physics

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