Strong cosmic censorship conjecture in higher curvature gravity

Mishra, Akash K.; Chakraborty, Sumanta

doi:10.1103/physrevd.101.064041

Cited by 27 publications

(27 citation statements)

References 75 publications

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“…Various studies have been conducted on wave scattering in such dS black holes [82][83][84][85][86][87][88][89][90][91][92][93][94][95]. Recently, the quasinormal modes (QNMs) of dS black holes were extensively studied considering the strong cosmic censorship conjecture [96][97][98][99][100][101][102]. Furthermore, the QNMs of black holes itself can be useful for analysis of the ringdown phase of the binary merger and its final state [103][104][105][106][107].…”

Section: Introductionmentioning

confidence: 99%

Weak cosmic censorship conjecture in Kerr-(anti-)de Sitter black hole with scalar field

Gwak

2018

J. High Energ. Phys.

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We investigate the weak cosmic censorship conjecture in Kerr-(anti-)de Sitter black holes under the scattering of a scalar field. We test the conjecture in terms of whether the black hole can exceed the extremal condition with respect to its change caused by the energy and angular momentum fluxes of the scalar field. Without imposing the laws of thermodynamics, we prove that the conjecture is valid in all the initial states of the black hole (non-extremal, near-extremal, and extremal black holes). The validity in the case of the near-extremal black hole is different from the results of similar tests conducted by adding a particle because the fluxes represent the energy and angular momentum transferred to the black hole during the time interval not included in the tests involving the particle. Using the time interval, we show that the angular velocity of the black hole with the scalar field of a constant state takes a long time for saturation to the frequency of the scalar field. 1 rasenis@sejong.ac.krBlack holes, which are directly proven to exist through detection by the Laser Interferometer Gravitational-Wave Observatory (LIGO), are among the most interesting topics in gravity theories. Classically, in the black hole spacetime, there is an event horizon through which no matter can escape from the black hole; thus, no radiation from the black hole can reach an observer located outside this horizon. However, in quantum theory, black holes act as thermal systems that emit energy through Hawking radiation [1,2]. In Hawking radiation, the Hawking temperature is defined for a black hole. Furthermore, when a particle is added to the black hole, depending on the conserved quantities of the particle, the conserved quantities of the black hole, such as mass and angular momentum, can increase or decrease. However, an irreducible quantity exists during this process, which is known as the irreducible mass [3][4][5]. The irreducible mass is the energy distributed on the surface of the horizon of the black hole [6]. Owing to the similarity between the irreducible mass and the thermodynamic entropy, the Bekenstein-Hawking entropy is defined to be proportional to the surface area of the black hole, which is the square of its irreducible mass [7,8]. Accordingly, we can establish the laws of thermodynamics for black holes.

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Section: Introductionmentioning

confidence: 99%

Weak cosmic censorship conjecture in Kerr-(anti-)de Sitter black hole with scalar field

Gwak

2018

J. High Energ. Phys.

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“…Let us proceed further to understand how this behaviour of the effective pressure will affect the bound on the photon circular orbit. First of all, the photon circular orbit on the equatorial plane is a solution to the algebraic equation, rν = 2, which on using Equation (24), yields the following algebraic equation,…”

Section: Bound On Circular Photon Orbits In Braneworld Gravitymentioning

confidence: 99%

“…Such a regime corresponds to the region near the singularity, both for black holes and cosmological spacetimes. Additionally, (i) the presence of late-time cosmic acceleration [14][15][16][17][18]; (ii) the violation of strong cosmic censorship conjecture [19][20][21][22][23][24]; and (iii) flat rotation curves of galaxies [25][26][27][28], among others, cannot be explained by classical general relativity with traditional matter content. These require either postulating existence of some exotic matter fields or theories beyond general relativity [29][30][31][32], or, some quantum effects must be taken into account [33].…”

Section: Introductionmentioning

confidence: 99%

Bound on Photon Circular Orbits in General Relativity and Beyond

Chakraborty

2021

Galaxies

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The existence of a photon circular orbit can tell us a lot about the nature of the underlying spacetime, since it plays a pivotal role in the understanding of the characteristic signatures of compact objects, namely the quasi-normal modes and shadow radius. For this purpose, determination of the location of the photon circular orbit is of utmost importance. In this work, we derive bounds on the location of the photon circular orbit around compact objects within the purview of general relativity and beyond. As we have explicitly demonstrated, contrary to the earlier results in the context of general relativity, the bound on the location of the photon circular orbit is not necessarily an upper bound. Depending on the matter content, it is possible to arrive at a lower bound as well. This has interesting implications for the quasi-normal modes and shadow radius, the two key observables related to the strong field tests of gravity. Besides discussing the bound for higher dimensional general relativity, we have also considered how the bound on the photon circular orbits gets modified in the braneworld scenario, for pure Lovelock and general Lovelock theories of gravity. Implications of these results for compact objects were also discussed.

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“…Although SCC has been inspected extensively for spherically black holes perturbed by scalar, fermion, electromagnetic, and gravitational field perturbations (see, for example, Refs. [20][21][22][23][24][25][25][26][27][28][29][30][31][32][33][34][35][36][37]), the investigations of the rotating cases seem to be limited [38][39][40][41][42]. Moreover, although the SCC of spacetimes in Einstein gravity has been investigated comprehensively, there is much that needs to be done in the modified gravities, being corrections to GR, following previous trials [43,44].…”

Section: Introductionmentioning

confidence: 99%

Strong cosmic censorship in near-extremal Kerr-Sen-de Sitter spacetime

Zhang

Jiang

2021

Eur. Phys. J. C

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In this work, we first calculate equations of motion for particles in the Kerr-Sen-de Sitter black hole spacetime. Then, in the eikonal regime, we analytically obtain the quasi-normal resonant modes of massless neutral scalar field perturbation and find its imaginary part to be characterized by the surface gravity of a near-extremal Kerr-Sen-de Sitter black hole with the Cauchy horizon approaching the event horizon. We further show that the Penrose strong cosmic censorship conjecture is thus respected in this spacetime with dilaton scalar field and axion pseudoscalar field.

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Strong cosmic censorship conjecture in higher curvature gravity

Cited by 27 publications

References 75 publications

Weak cosmic censorship conjecture in Kerr-(anti-)de Sitter black hole with scalar field

Weak cosmic censorship conjecture in Kerr-(anti-)de Sitter black hole with scalar field

Bound on Photon Circular Orbits in General Relativity and Beyond

Strong cosmic censorship in near-extremal Kerr-Sen-de Sitter spacetime

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