Dilaton Black Holes, Naked Singularities and Strings

We test whether static charged dilaton black holes in [Formula: see text] dimensions can be turned into naked singularities by sending in test particles from infinity. We derive that overcharging is possible and generic for both extremal and nearly extremal black holes. Our analysis also implies that nearly extremal charged dilaton black holes can be continuously driven to extremality and beyond, unlike nearly extremal Ban̆ados–Teitelboim–Zanelli, Kerr and Reissner–Nordström black holes which are overspun or overcharged by a discrete jump. Thus, the weak form of the cosmic censorship conjecture and the third law of black hole thermodynamics are both violated in the interaction of charged dilaton black holes in [Formula: see text] dimensions, with test particles. We also derive that there exist no points, where the heat capacity vanishes or diverges in the transition from black holes to naked singularities. The phase transitions that could potentially prevent the formation of naked singularities do not occur.

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Asymptotically non-flat rotating dilaton black holes

Classical and Quantum Gravity ◽

10.1088/0264-9381/20/7/311 ◽

2003 ◽

Vol 20 (7) ◽

pp. 1403-1410 ◽

Cited By ~ 25

Author(s):

Tanwi Ghosh ◽

P Mitra

Keyword(s):

Black Holes ◽

Dilaton Black Holes

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The spectrum of electromagnetic jets from Kerr black holes and naked singularities in the Teukolsky perturbation theory

Astrophysics and Space Science ◽

10.1007/s10509-010-0520-x ◽

2010 ◽

Vol 332 (2) ◽

pp. 385-401 ◽

Cited By ~ 6

Author(s):

Denitsa Staicova ◽

Plamen Fiziev

Keyword(s):

Black Holes ◽

Perturbation Theory ◽

Naked Singularities ◽

Kerr Black Holes

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Quasinormal modes of weakly charged Einstein-Maxwell-dilaton black holes

Physical Review D ◽

10.1103/physrevd.98.104042 ◽

2018 ◽

Vol 98 (10) ◽

Cited By ~ 8

Author(s):

Costantino Pacilio ◽

Richard Brito

Keyword(s):

Black Holes ◽

Quasinormal Modes ◽

Dilaton Black Holes

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Critical behavior of Lifshitz dilaton black holes

Physical Review D ◽

10.1103/physrevd.98.104026 ◽

2018 ◽

Vol 98 (10) ◽

Cited By ~ 7

Author(s):

Zeinab Dayyani ◽

Ahmad Sheykhi

Keyword(s):

Black Holes ◽

Critical Behavior ◽

Dilaton Black Holes

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HIGHER DIMENSIONAL INHOMOGENEOUS DUST COLLAPSE AND COSMIC CENSORSHIP

International Journal of Modern Physics A ◽

10.1142/s0217751x02011746 ◽

2002 ◽

Vol 17 (20) ◽

pp. 2747-2747

Author(s):

A. BEESHAM

Keyword(s):

Black Holes ◽

Cosmic Censorship ◽

De Sitter Spacetime ◽

De Sitter ◽

Naked Singularities ◽

Singularity Theorems ◽

Sitter Spacetime ◽

Higher Dimensional ◽

Cosmic Censorship Hypothesis ◽

Strong Curvature

The singularity theorems of general relativity predict that gravitational collapse finally ends up in a spacetime singularity1. The cosmic censorship hypothesis (CCH) states that such a singularity is covered by an event horizon2. Despite much effort, there is no rigorous formulation or proof of the CCH. In view of this, examples that appear to violate the CCH and lead to naked singularities, in which non-spacelike curves can emerge, rather than black holes, are important to shed more light on the issue. We have studied several collapse scenarios which can lead to both situations3. In the case of the Vaidya-de Sitter spacetime4, we have shown that the naked singularities that arise are of the strong curvature type. Both types of singularities can also arise in higher dimensional Vaidya and Tolman-Bondi spacetimes, but black holes are favoured in some sense by the higher dimensions. The charged Vaidya-de Sitter spacetime also exhibits both types of singularities5.

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