Can quantum mechanics fool the cosmic censor?

Matsas, George E. A.; Richartz, Maurício; Saa, Alberto; Silva, A. R. R. da; Vanzella, Daniel A. T.

doi:10.1103/physrevd.79.101502

Cited by 61 publications

(72 citation statements)

References 19 publications

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“…Quantum processes aside, no known classical mechanism can destroy a black hole. One of such processes was considered by Wald [1] many years ago and revisited recently [2][3][4][5][6]. It consists in throwing a point particle at a (four-dimensional) Kerr black hole with just the right angular momentum to spin the black hole up in such a way that eventually the horizon is disrupted.…”

Section: Introductionmentioning

confidence: 99%

Black holes die hard: Can one spin up a black hole past extremality?

et al. 2010

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A possible process to destroy a black hole consists on throwing point particles with sufficiently large angular momentum into the black hole. In the case of Kerr black holes, it was shown by Wald that particles with dangerously large angular momentum are simply not captured by the hole, and thus the event horizon is not destroyed. Here we reconsider this gedanken experiment for a variety of black hole geometries, from black holes in higher dimensions to black rings. We show that this particular way of destroying a black hole does not succeed and that Cosmic Censorship is preserved.

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Section: Introductionmentioning

confidence: 99%

Black holes die hard: Can one spin up a black hole past extremality?

et al. 2010

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“…However, since we lack a complete description of the quantum gravity regime, a final conclusion cannot yet be obtained, see Refs. [9][10][11][12][13][14] for further details and considerations.…”

Section: Introductionmentioning

confidence: 99%

Challenging the weak cosmic censorship conjecture with charged quantum particles

Richartz

Saa

2011

Phys. Rev. D

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Motivated by the recent attempts to violate the weak cosmic censorship conjecture for near-extreme black holes, we consider the possibility of overcharging a near-extreme Reissner-Nordström black hole by the quantum tunneling of charged particles. We consider the scattering of spin-0 and spin-1 2 particles by the black hole in a unified framework and obtain analytically, for the first time, the pertinent reflection and transmission coefficients without any small charge approximation. Based on these results, we propose some gedanken experiments that could lead to the violation of the weak cosmic censorship conjecture due to the (classically forbidden) absorption of small energy charged particles by the black hole. As for the case of scattering in Kerr spacetimes, our results demonstrate explicitly that scalar fields are subject to (electrical) superradiance phenomenon, while spin-1 2 fields are not. Superradiance impose some limitations on the gedanken experiments involving spin-0 fields, favoring, in this way, the mechanisms for creation of a naked singularity by the quantum tunneling of spin-1 2 charged fermions. We also discuss the implications that vacuum polarization effects and quantum statistics might have on these gedanken experiments. In particular, we show that they are not enough to prevent the absorption of incident small energy particles and, consequently, the formation of a naked singularity.

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“…The observation of a 'naked singularity' could pose a fundamental problem for the notion of causality. The formation of an extreme KN (XKN) black hole could violate the WCCC as the associated event horizon would vanish (Matsas & da Silva 2007;Hod 2008a,b;Matsas et al 2009). A KN black hole is characterized by a mass M , charge Q and rotational angular momentum J .…”

Section: Discussionmentioning

confidence: 99%

“…Note also that equation (4.1) is identical to the entropy (2.1) of an ScBH if μ = M . According to some investigations of quantum particles in the KN and RN metrics, it is possible for interactions with certain incident particles to cause a nearly extreme black hole to become extreme (Matsas & da Silva 2007;Matsas et al 2009). Other investigations have advanced the contrary conclusion by demonstrating inherent details of the interactions that ultimately prohibit the elimination of the event horizon (Hod 2008a,b).…”

Section: Discussionmentioning

confidence: 99%

Particle absorption by black holes and the generalized second law of thermodynamics

Funkhouser

2009

Proc. R. Soc. A.

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The change in entropy, S , associated with the quasi-static absorption of a particle of energy ε by a Schwarzschild black hole (ScBH) is approximately (ε/T ) − s, where T is the Hawking temperature of the black hole and s is the entropy of the particle. Motivated by the statistical interpretation of entropy, it is proposed here that the absorption should be suppressed, but not forbidden, when S < 0, which requires the absorption cross section to be sensitive to S . A purely thermodynamic formulation of the probability for the absorption is obtained from the standard relationship between microstates and entropy. If S 1 and s ε/T , then the probability for the particle not to be absorbed is approximately exp[−ε/T ], which is identical to the probability for quantum mechanical reflection by the horizon of an ScBH. The manifestation of quantum behaviours in the new probability function may intimate a fundamental physical unity between thermodynamics and quantum mechanics.

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Can quantum mechanics fool the cosmic censor?

Cited by 61 publications

References 19 publications

Black holes die hard: Can one spin up a black hole past extremality?

Black holes die hard: Can one spin up a black hole past extremality?

Challenging the weak cosmic censorship conjecture with charged quantum particles

Particle absorption by black holes and the generalized second law of thermodynamics

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