Log in

Relevant bibliographies by topics / Cosmic censorship conjecture / Journal articles

To see the other types of publications on this topic, follow the link: Cosmic censorship conjecture.

Journal articles on the topic 'Cosmic censorship conjecture'

Author: Grafiati

Published: 4 June 2021

Last updated: 7 February 2022

Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles

Select a source type:

Consult the top 50 journal articles for your research on the topic 'Cosmic censorship conjecture.'

Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.

You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.

Browse journal articles on a wide variety of disciplines and organise your bibliography correctly.

1

Hamid, Aymen I. M., Rituparno Goswami, and Sunil D. Maharaj. "Cosmic censorship conjecture revisited: covariantly." Classical and Quantum Gravity 31, no. 13 (June 17, 2014): 135010. http://dx.doi.org/10.1088/0264-9381/31/13/135010.

Full text

APA, Harvard, Vancouver, ISO, and other styles

2

Gwak, Bogeun. "Thermodynamics and Cosmic Censorship Conjecture in Kerr–Newman–de Sitter Black Hole." Entropy 20, no. 11 (November 7, 2018): 855. http://dx.doi.org/10.3390/e20110855.

Full text

Abstract:

We investigate the laws of thermodynamics and the validity of the cosmic censorship conjecture in the Kerr–Newman–de Sitter black hole under charged particle absorption. Here, the black hole undergoes infinitesimal changes because of the momenta carried by the particle entering it. The cosmic censorship conjecture is tested by whether the black hole can be overcharged beyond the extremal condition under absorption. The changes in the black hole violate the second law of thermodynamics. Furthermore, this is related to the cosmic censorship conjecture. To resolve this violation, we impose a reference energy of the particle at the asymptotic region based on the first law of thermodynamics. Under imposition of the reference energy, the absorption satisfies the laws of thermodynamics, and the extremal black hole cannot be overcharged. Thus, the cosmic censorship conjecture is valid under the absorption.

APA, Harvard, Vancouver, ISO, and other styles

3

GWAK, Bogeun. "Finding the Singularity of a Black Hole: Cosmic Censorship Conjecture." Physics and High Technology 29, no. 12 (December 31, 2020): 10–16. http://dx.doi.org/10.3938/phit.29.044.

Full text

Abstract:

According to the singularity theorem, a curvature singularity can be formed in a gravitational collapse under the null energy condition. Eventually, the singularity possesses sufficient mass density for the horizon to appear, and the compact object thereby evolves into a black hole. Hence, on the basis of general relativity, the singularity must be located at the center of the black hole. Our curiosity begins here: can we see the singularity? To answer this question, the cosmic censorship conjecture comes into play. That conjecture, which was originally proposed by Penrose, has two versions. The weak version states that a static observer located outside the black hole cannot see the singularity. Furthermore, the strong version states that no observers can see the singularity. Studies regarding the cosmic censorship conjecture are still ongoing, and evidently, its validation requires a deep understanding of the theory of gravity, including general relativity. Herein, we review the progress of studies associated with the weak and the strong cosmic censorship conjectures. Furthermore, we briefly describe the Penrose process for extracting energy from a black hole.

APA, Harvard, Vancouver, ISO, and other styles

4

Hong, Wei, Benrong Mu, and Jun Tao. "Testing the weak cosmic censorship conjecture in torus-like black hole under charged scalar field." International Journal of Modern Physics D 29, no. 12 (July 25, 2020): 2050078. http://dx.doi.org/10.1142/s0218271820500789.

Full text

Abstract:

We investigate weak cosmic censorship conjecture in charged torus-like black hole by the complex scalar field scattering. Using the relation between the conserved quantities of a black hole and the scalar field, we can calculate the change of the energy and charge within the infinitesimal time. The change of the enthalpy is connected to the change of energy, then we use those results to test whether the first law, the second law as well as the weak cosmic censorship conjecture are valid. In the normal phase–space, the first law of thermodynamics and the weak cosmic censorship conjecture are valid, and the second law of thermodynamics is not violated. For the specific black hole under scalar field scattering we consider, in the extended phase–space, the first law of thermodynamics and the weak cosmic censorship conjecture are valid. However, the second law of thermodynamics is violated when the black hole’s initial charge reaches a certain value.

APA, Harvard, Vancouver, ISO, and other styles

5

Mu, Benrong, Jun Tao, and Peng Wang. "Minimal Length Effect on Thermodynamics and Weak Cosmic Censorship Conjecture in Anti-de Sitter Black Holes via Charged Particle Absorption." Advances in High Energy Physics 2020 (January 9, 2020): 1–9. http://dx.doi.org/10.1155/2020/2612946.

Full text

Abstract:

In this paper, we investigate the minimal length effects on the thermodynamics and weak cosmic censorship conjecture in a RN-AdS black hole via charged particle absorption. We first use the generalized uncertainty principle (GUP) to investigate the minimal length effect on the Hamilton-Jacobi equation. After the deformed Hamilton-Jacobi equation is derived, we use it to study the variations of the thermodynamic quantities of a RN-Ads black hole via absorbing a charged particle. Furthermore, we check the second law of thermodynamics and the weak cosmic censorship conjecture in two phase spaces. In the normal phase space, the second law of thermodynamics and the weak cosmic censorship conjecture are satisfied in the usual and GUP-deformed cases, and the minimal length effect makes the increase of entropy faster than the usual case. After the charge particle absorption, the extremal RN-AdS black hole becomes nonextremal. In the extended phase space, the black hole entropy can either increase or decrease. When T>2Pr+, the second law is satisfied. When T<2Pr+, the second law of thermodynamics is violated for the extremal or near-extremal black hole. Finally, we find that the weak cosmic censorship conjecture is legal for extremal and near-extremal RN-Ads black holes in the GUP-deformed case.

APA, Harvard, Vancouver, ISO, and other styles

6

Andréasson, Håkan. "On gravitational collapse and cosmic censorship for collisionless matter." International Journal of Geometric Methods in Modern Physics 11, no. 02 (February 2014): 1460002. http://dx.doi.org/10.1142/s0219887814600020.

Full text

Abstract:

The weak cosmic censorship conjecture is a central open problem in classical general relativity. Under the assumption of spherical symmetry, Christodoulou has investigated the conjecture for two different matter models; a scalar field and dust. He has shown that the conjecture holds true for a scalar field but that it is violated in the case of dust. The outcome of the conjecture is thus sensitive to which model is chosen to describe matter. Neither a scalar field nor dust are realistic matter models. Collisionless matter, or Vlasov matter, is a simple matter model but can be considered to be realistic in the sense that it is used by astrophysicists. The present status on the weak cosmic censorship conjecture for the Einstein–Vlasov system is reviewed here.

APA, Harvard, Vancouver, ISO, and other styles

7

Carvalho, Patrícia, Miguel Campos, and Brisa Terezón. "The Cosmic Censorship and Kantowski-Sachs Model." International Journal of Modern Physics: Conference Series 45 (January 2017): 1760014. http://dx.doi.org/10.1142/s201019451760014x.

Full text

APA, Harvard, Vancouver, ISO, and other styles

8

Hod, Shahar. "A proof of the strong cosmic censorship conjecture." International Journal of Modern Physics D 29, no. 14 (July 7, 2020): 2042003. http://dx.doi.org/10.1142/s0218271820420031.

Full text

Abstract:

The Penrose strong cosmic censorship conjecture asserts that Cauchy horizons inside dynamically formed black holes are unstable to remnant matter fields that fall into the black holes. The physical importance of this conjecture stems from the fact that it provides a necessary condition for general relativity to be a truly deterministic theory of gravity. Determining the fate of the Penrose conjecture in nonasymptotically flat black hole spacetimes has been the focus of intense research efforts in recent years. In this paper, we provide a remarkably compact proof, which is based on Bekenstein’s generalized second law of thermodynamics, for the validity of the intriguing Penrose conjecture in physically realistic (dynamically formed) curved black hole spacetimes.

APA, Harvard, Vancouver, ISO, and other styles

9

JOSHI, PANKAJ S. "COSMIC CENSORSHIP: A CURRENT PERSPECTIVE." Modern Physics Letters A 17, no. 15n17 (June 7, 2002): 1067–79. http://dx.doi.org/10.1142/s0217732302007570.

Full text

Abstract:

End state of gravitational collapse and the related cosmic censorship conjecture continue to be amongst the most important open problems in gravitation physics today. My purpose here is to bring out several aspects related to gravitational collapse and censorship, which may help towards a better understanding of the issues involved. Possible physical constraints on gravitational collapse scenarios are considered. It is concluded that the best hope for censorship lies in analyzing the genericity and stability properties of the currently known classes of collapse models which lead to the formation of naked singularities, rather than black holes, as the final state of collapse and which develop from a regular initial data.

APA, Harvard, Vancouver, ISO, and other styles

10

Zhang, Yuan, and Sijie Gao. "Testing cosmic censorship conjecture near extremal black holes with cosmological constants." International Journal of Modern Physics D 23, no. 05 (April 30, 2014): 1450044. http://dx.doi.org/10.1142/s0218271814500448.

Full text

Abstract:

It has been shown previously that an extremal Reissner–Nordström or an extremal Kerr black hole cannot be overcharged or overspun by a test particle, if radiative and self-force effects are neglected. In this paper, we consider extremal charged and rotating black holes with cosmological constants. By studying the motion of test particles, we find the following results: An extremal Reissner–Nordström anti-de Sitter (RN–AdS) black hole can be overcharged by a test particle but an extremal Reissner–Nordström de Sitter (RN–dS) black hole cannot be overcharged. We also show that both extremal Kerr–de Sitter (Kerr–dS) and Kerr–anti-de Sitter (Kerr–AdS) black holes can be overspun by a test particle, implying a possible breakdown of the cosmic censorship conjecture. For the Kerr–AdS case, the overspinning requires that the energy of the particle be negative, a reminiscent of the Penrose process. In contrast to the extremal RN and Kerr black holes, in which cases the cosmic censorship is upheld, our results suggest some subtle relations between the cosmological constants and the cosmic censorship. We also discuss the effect of radiation reaction for the Kerr–dS case and find that the magnitude of energy loss due to gravitational radiation may not be enough to prevent the violation of the cosmic censorship.

APA, Harvard, Vancouver, ISO, and other styles

11

Emparan, Roberto. "Predictivity lost, predictivity regained: A Miltonian cosmic censorship conjecture." International Journal of Modern Physics D 29, no. 14 (September 29, 2020): 2043021. http://dx.doi.org/10.1142/s021827182043021x.

Full text

Abstract:

Cosmic censorship is known to fail in some well-controlled phenomena, calling into question the predictive power of General Relativity and opening up the possibility of observing Planck-scale physics. We propose that the cosmic censorship conjecture can be amended so that its spirit prevails. Naked singularities that, classically, have zero mass are allowed. Physically, these are Planck-sized “black holes”, which evaporate in a few Planck times. General Relativity fails only for a tiny interval in time, to then quickly regain control in a Miltonian evolution that returns us to the predictive paradise of Einstein’s equations. If this refinement of the conjecture is correct, then, even though Nature does allow to expose breakdowns in the smooth fabric of spacetime, it limits them to a mostly harmless minimum.

APA, Harvard, Vancouver, ISO, and other styles

12

GHOSH, S. G. "NONSPHERICAL COLLAPSE OF TWO-FLUID STAR." International Journal of Modern Physics A 23, no. 25 (October 10, 2008): 4245–54. http://dx.doi.org/10.1142/s0217751x08041657.

Full text

Abstract:

We obtain the analog of collapsing Vaidya-like solution to include both a null fluid and a string fluid, with a linear equation of state (p⊥ = kρ), in nonspherical (plane symmetric and cylindrically symmetric) anti-de Sitter space–times. It turns out that the nonspherical collapse of two fluid in anti-de Sitter space–times, in accordance with cosmic censorship, proceed to form black holes, i.e. on naked singularity ever forms, in accordance with cosmic censorship, violating hoop conjecture.

APA, Harvard, Vancouver, ISO, and other styles

13

Hod, Shahar. "Hawking radiation may violate the Penrose cosmic censorship conjecture." International Journal of Modern Physics D 28, no. 14 (October 2019): 1944023. http://dx.doi.org/10.1142/s0218271819440231.

Full text

Abstract:

We analyze the Hawking evaporation process of Reissner–Nordström black holes. It is shown that the characteristic radiation quanta emitted by the charged black holes may turn near-extremal black-hole spacetimes into horizonless naked singularities. This analysis therefore reveals the intriguing possibility that the semi-classical Hawking evaporation process of black holes may violate the fundamental Penrose cosmic censorship conjecture.

APA, Harvard, Vancouver, ISO, and other styles

14

Shaymatov, Sanjar. "Magnetized Reissner–Nordström black hole restores cosmic censorship conjecture." International Journal of Modern Physics: Conference Series 49 (January 2019): 1960020. http://dx.doi.org/10.1142/s2010194519600206.

Full text

Abstract:

We investigate the effect of magnetic field on the process of overcharging magnetized Reissner–Nordström black hole. It is well known that a four dimensional charged black hole could be overcharged. Contrary to this, we show that a magnetized charged black hole could not be overcharged beyond threshold value of the magnetic field. This occurs because the magnetic field does not allow for particle to reach black hole horizon. Thus magnetic field beyond its threshold value could restore the cosmic censorship conjecture.

APA, Harvard, Vancouver, ISO, and other styles

15

Ong, Yen Chin. "Space–time singularities and cosmic censorship conjecture: A Review with some thoughts." International Journal of Modern Physics A 35, no. 14 (May 20, 2020): 2030007. http://dx.doi.org/10.1142/s0217751x20300070.

Full text

Abstract:

The singularity theorems of Hawking and Penrose tell us that singularities are common place in general relativity. Singularities not only occur at the beginning of the Universe at the Big Bang, but also in complete gravitational collapses that result in the formation of black holes. If singularities — except the one at the Big Bang — ever become “naked,” i.e. not shrouded by black hole horizons, then it is expected that problems would arise and render general relativity indeterministic. For this reason, Penrose proposed the cosmic censorship conjecture, which states that singularities should never be naked. Various counterexamples to the conjecture have since been discovered, but it is still not clear under which kind of physical processes one can expect violation of the conjecture. In this short review, I briefly examine some progresses in space–time singularities and cosmic censorship conjecture. In particular, I shall discuss why we should still care about the conjecture, and whether we should be worried about some of the counterexamples. This is not meant to be a comprehensive review, but rather to give an introduction to the subject, which has recently seen an increase of interest.

APA, Harvard, Vancouver, ISO, and other styles

16

Liang, Bin, Shao-Wen Wei, and Yu-Xiao Liu. "Weak cosmic censorship conjecture in Kerr black holes of modified gravity." Modern Physics Letters A 34, no. 05 (February 20, 2019): 1950037. http://dx.doi.org/10.1142/s0217732319500378.

Full text

Abstract:

By neglecting the effects of self-force and radiation, we investigate the possibility of destroying the Kerr-MOG black hole through the point particle absorption process. Using the instability of event horizon and equation of particle motion, we get the upper and lower energy bounds allowed for a matter particle to produce the naked singularity. We find that the energy gap always exists between the upper and lower energy bounds for both extremal and near-extremal black holes, which means some tailored particles can actually lead to the violation of the weak cosmic censorship conjecture. However, when considering the effect of the adiabatic process, the result shows that the Kerr-MOG black hole gets more stable instead of a naked singularity, and thus the weak cosmic censorship conjecture can be restored at some level.

APA, Harvard, Vancouver, ISO, and other styles

17

Nakao, Ken-ichi, Kouji Nakamura, and Takashi Mishima. "The hoop conjecture and cosmic censorship in the brane-world." Physics Letters B 564, no. 1-2 (July 2003): 143–48. http://dx.doi.org/10.1016/s0370-2693(03)00588-4.

Full text

APA, Harvard, Vancouver, ISO, and other styles

18

Rahman, Mostafizur, Soumodeep Mitra, and Sumanta Chakraborty. "Strong cosmic censorship conjecture with NUT charge and conformal coupling." Classical and Quantum Gravity 37, no. 19 (September 10, 2020): 195004. http://dx.doi.org/10.1088/1361-6382/aba17d.

Full text

APA, Harvard, Vancouver, ISO, and other styles

19

Khodabakhshi, H., and F. Shojai. "Cosmic censorship conjecture in a general Kerr–Newman black hole." Annals of Physics 420 (September 2020): 168271. http://dx.doi.org/10.1016/j.aop.2020.168271.

Full text

APA, Harvard, Vancouver, ISO, and other styles

20

GHOSH, S. G., R. V. SARAYKAR, and A. BEESHAM. "COLLAPSING SHELLS OF RADIATION IN HIGHER DIMENSIONAL SPACE–TIME AND COSMIC CENSORSHIP CONJECTURE." International Journal of Modern Physics A 16, no. 27 (October 30, 2001): 4481–88. http://dx.doi.org/10.1142/s0217751x01004943.

Full text

Abstract:

Gravitational collapse of radiation shells in a non-self-similar higher dimensional spherically symmetric space–time is studied. Strong curvature naked singularities form a highly inhomogeneous collapse, violating the cosmic censorship conjecture. As a special case, self similar models can be constructed.

APA, Harvard, Vancouver, ISO, and other styles

21

Chen, Deyou. "Weak cosmic censorship conjecture in BTZ black holes with scalar fields." Chinese Physics C 44, no. 1 (January 2020): 015101. http://dx.doi.org/10.1088/1674-1137/44/1/015101.

Full text

APA, Harvard, Vancouver, ISO, and other styles

22

Barrabès, C., W. Israel, and P. S. Letelier. "Analytic models of nonspherical collapse, cosmic censorship and the hoop conjecture." Physics Letters A 160, no. 1 (November 1991): 41–44. http://dx.doi.org/10.1016/0375-9601(91)90203-k.

Full text

APA, Harvard, Vancouver, ISO, and other styles

23

Campos, M. "The Cosmic Censorship Conjecture in a Higher Dimensional Spacetime and Λ." International Journal of Theoretical Physics 55, no. 3 (September 22, 2015): 1728–40. http://dx.doi.org/10.1007/s10773-015-2813-x.

Full text

APA, Harvard, Vancouver, ISO, and other styles

24

Etesi, Gábor. "Exotica or the failure of the strong cosmic censorship in four dimensions." International Journal of Geometric Methods in Modern Physics 12, no. 10 (October 25, 2015): 1550121. http://dx.doi.org/10.1142/s0219887815501212.

Full text

Abstract:

In this paper, a generic counterexample to the strong cosmic censor conjecture is exhibited. More precisely — taking into account that the conjecture lacks any precise formulation yet — first we make sense of what one would mean by a "generic counterexample" by introducing the mathematically unambigous and logically stronger concept of a "robust counterexample". Then making use of Penrose' nonlinear graviton construction (i.e. twistor theory) and a Wick rotation trick we construct a smooth Ricci-flat but not flat Lorentzian metric on the largest member of the Gompf — Taubes uncountable radial family of large exotic ℝ4's. We observe that this solution of the Lorentzian vacuum Einstein's equations with vanishing cosmological constant provides us with a sort of counterexample which is weaker than a "robust counterexample" but still reasonable to consider as a "generic counterexample". It is interesting that this kind of counterexample exists only in four dimensions.

APA, Harvard, Vancouver, ISO, and other styles

25

Düztaş, Koray. "Over-spinning Kerr–Sen black holes with test fields." International Journal of Modern Physics D 28, no. 02 (January 2019): 1950044. http://dx.doi.org/10.1142/s0218271819500445.

Full text

Abstract:

In this work, we investigate validity of the weak form of the cosmic censorship conjecture in the interaction of Kerr–Sen black holes with neutral test fields. Previous studies of the Klein–Gordon equation on Kerr–Sen background imply that superradiance occurs for scalar fields. We show that scalar fields can overspin a nearly extremal black hole into a naked singularity, but the modes that could overspin an extremal black hole are not absorbed due to superradiance. From Kerr analogy one can naively expect superradiance to be absent for fermionic fields. In such a case overspinning becomes generic and also applies to extremal Kerr–Sen black holes. This robust violation of cosmic censorship cannot be fixed by backreaction effects which are ignored in this work. These results are analogous to the Kerr case.

APA, Harvard, Vancouver, ISO, and other styles

26

VICKERS, J. A. "WEAK SINGULARITIES IN GENERAL RELATIVITY." International Journal of Modern Physics A 17, no. 20 (August 10, 2002): 2779. http://dx.doi.org/10.1142/s0217751x02012065.

Full text

Abstract:

According to the Cosmic Censorship hypothesis realistic singularities should be hidden by an event horizon. However there are many examples of physically realistic space–times which are geodesically incomplete, and hence possess singularities according to the usual definition, which are not inside an event horizon. Many of these counterexamples to the cosmic censorship conjecture have a curvature tensor which is reasonably behaved (for example bounded or integrable) as one approaches the singularity. We give a class of weak singularities which may be described as having distributional curvature1. Because of the non–linear nature of Einstein's equations such distributional geometries are described using a diffeomorphism invariant theory of non–linear generalised functions2. We also investigate the propagation of test fields on space–times with weak singularities. We give a class of singularities3,4 which do not disrupt the Cauchy development of test fields and result in space–times which satisfy Clarke's criterion of 'generalised hyperbolicity'. We consider that points which are well behaved in this way, and where Einstein's equations make sense distributionally, should be regarded as interior points of the space–time rather than counterexamples to cosmic censorship.

APA, Harvard, Vancouver, ISO, and other styles

27

GHOSH, S. G., and D. W. DESHKAR. "GRAVITATIONAL COLLAPSE OF PERFECT FLUID IN SELF-SIMILAR HIGHER DIMENSIONAL SPACE–TIMES." International Journal of Modern Physics D 12, no. 05 (May 2003): 913–24. http://dx.doi.org/10.1142/s021827180300344x.

Full text

Abstract:

We investigate the occurrence and nature of naked singularities in the gravitational collapse of an adiabatic perfect fluid in self-similar higher dimensional space–times. It is shown that strong curvature naked singularities could occur if the weak energy condition holds. Its implication for cosmic censorship conjecture is discussed. Known results of analogous studies in four dimensions can be recovered.

APA, Harvard, Vancouver, ISO, and other styles

28

Israel, Werner. "The formation of black holes in nonspherical collapse and cosmic censorship." Canadian Journal of Physics 64, no. 2 (February 1, 1986): 120–27. http://dx.doi.org/10.1139/p86-018.

Full text

Abstract:

Circumstantial evidence favouring the broad conjecture that event horizons always form in gravitational collapse is summarized along with the mounting counterevidence to a more restrictive cosmic censorship principle, which would compel every singularity formed in the collapse to be enclosed within a horizon. A confinement theorem is presented, stating that a closed, initially-trapped 2-surface of fixed area that remains regular will act as a wall that permanently seals off its interior contents from causal influence on the environment.

APA, Harvard, Vancouver, ISO, and other styles

29

Zeng, Xiao-Xiong, and Hai-Qing Zhang. "Thermodynamics and weak cosmic censorship conjecture in the Kerr-AdS black hole." Nuclear Physics B 959 (October 2020): 115162. http://dx.doi.org/10.1016/j.nuclphysb.2020.115162.

Full text

APA, Harvard, Vancouver, ISO, and other styles

30

Yu, Ten-Yeh, and Wen-Yu Wen. "Cosmic censorship and Weak Gravity Conjecture in the Einstein–Maxwell-dilaton theory." Physics Letters B 781 (June 2018): 713–18. http://dx.doi.org/10.1016/j.physletb.2018.04.060.

Full text

APA, Harvard, Vancouver, ISO, and other styles

31

Unnikrishnan, C. S. "Physically motivated proof of the cosmic censorship conjecture for Tolman-Bondi dust." Physical Review D 53, no. 2 (January 15, 1996): R580—R583. http://dx.doi.org/10.1103/physrevd.53.r580.

Full text

APA, Harvard, Vancouver, ISO, and other styles

32

Wagh, S. M., and S. D. Maharaj. "Naked Singularity of the Vaidya-de Sitter Spacetime and Cosmic Censorship Conjecture." General Relativity and Gravitation 31, no. 7 (July 1999): 975–82. http://dx.doi.org/10.1023/a:1026675313562.

Full text

APA, Harvard, Vancouver, ISO, and other styles

33

Gwak, Bogeun. "Review of weak cosmic censorship conjecture in black hole with particle absorption." Journal of the Korean Physical Society 78, no. 10 (March 12, 2021): 892–96. http://dx.doi.org/10.1007/s40042-021-00124-z.

Full text

APA, Harvard, Vancouver, ISO, and other styles

34

OLIVEIRA-NETO, G. "NAKED SINGULARITIES IN THREE-DIMENSIONS." International Journal of Modern Physics D 12, no. 05 (May 2003): 791–99. http://dx.doi.org/10.1142/s0218271803003335.

Full text

Abstract:

We study an analytical solution to the Einstein's equations in (2+1)-dimensions, representing the self-similar collapse of a circularly symmetric, minimally coupled, massless, scalar field. Depending on the value of certain parameters, this solution represents the formation of naked singularities. Since our solution is asymptotically flat, these naked singularities may be relevant for the weak cosmic censorship conjecture in (2+1)-dimensions.

APA, Harvard, Vancouver, ISO, and other styles

35

CHAKRABORTY, SANJUKTA, SUBENOY CHAKRABORTY, and UJJAL DEBNATH. "THE EFFECT OF PRESSURE IN HIGHER DIMENSIONAL QUASI-SPHERICAL GRAVITATIONAL COLLAPSE." International Journal of Modern Physics D 16, no. 05 (May 2007): 833–46. http://dx.doi.org/10.1142/s0218271807010432.

Full text

Abstract:

We study gravitational collapse in higher dimensional quasi-spherical Szekeres space–time for matter with anisotropic pressure. Both local and global visibility of central curvature singularity has been studied and it is found that with proper choice of initial data it is possible to show the validity of Cosmic Censorship Conjecture for six and higher dimensions. Also the role of pressure in the collapsing process has been discussed.

APA, Harvard, Vancouver, ISO, and other styles

36

GOSWAMI, RITUPARNO, and PANKAJ S. JOSHI. "GRAVITATIONAL COLLAPSE OF A SELF-INTERACTING SCALAR FIELD." Modern Physics Letters A 22, no. 01 (January 10, 2007): 65–74. http://dx.doi.org/10.1142/s0217732307020701.

Full text

Abstract:

We construct and study here a class of collapsing scalar field models with a nonzero potential. The weak energy condition is satisfied by the collapsing configuration and it is shown that the end state of collapse could be either a black hole or a naked singularity. It is seen that physically it is the rate of collapse that governs these outcomes of the dynamical evolution. The implications for the cosmic censorship conjecture are discussed.

APA, Harvard, Vancouver, ISO, and other styles

37

Pushp, Amal. "Can Naked Singularities Exist Without Violating The Laws of Black Hole Thermodynamics?" JOURNAL OF ADVANCES IN PHYSICS 19 (July 30, 2021): 204–7. http://dx.doi.org/10.24297/jap.v19i.9089.

Full text

Abstract:

According to the cosmic censorship conjecture, it is impossible for nature to have a physical singularity without a horizon because if it were to arise in any formalism, for instance as an extremal black hole (Kerr or Reissner-Nordstrom) then the surface gravity κ = 0, which is a strict violation of the third law of black hole thermodynamics. In this paper we explore whether a true singularity can exist without defying this law.

APA, Harvard, Vancouver, ISO, and other styles

38

张, 明. "Application of Wald Test Particle Approximation Method in the Weak Cosmic Censorship Conjecture." Open Journal of Nature Science 06, no. 05 (2018): 383–90. http://dx.doi.org/10.12677/ojns.2018.65049.

Full text

APA, Harvard, Vancouver, ISO, and other styles

39

Brinis, E., S. Jhingan, and G. Magli. "On the cosmic censorship conjecture for spherically symmetric, shear-free perfect fluid spacetimes." Classical and Quantum Gravity 17, no. 21 (October 11, 2000): 4481–90. http://dx.doi.org/10.1088/0264-9381/17/21/309.

Full text

APA, Harvard, Vancouver, ISO, and other styles

40

Li, Zhen, Yunjiao Gao, and Xiao-Kan Guo. "Weak cosmic censorship conjecture in higher-dimensional black holes with nonlinear electrodynamic sources." Physics Letters B 817 (June 2021): 136303. http://dx.doi.org/10.1016/j.physletb.2021.136303.

Full text

APA, Harvard, Vancouver, ISO, and other styles

41

Li, Liu, Zi-Yu Fu, Qian Zhao, and Hui-Ling Li. "Thermodynamics and weak cosmic censorship conjecture of the high dimensional hairy AdS spacetime." Physica Scripta 96, no. 12 (August 27, 2021): 125004. http://dx.doi.org/10.1088/1402-4896/ac1afe.

Full text

APA, Harvard, Vancouver, ISO, and other styles

42

Corral Bustamante, R. Leticia, Aarón Raúl Rodríguez-Corral, T. J. Amador-Parra, and E. A. Vázquez-Tapia. "Cosmic Censorship!: Thermal Transport in a ‘Naked’ Black Hole." Defect and Diffusion Forum 312-315 (April 2011): 27–32. http://dx.doi.org/10.4028/www.scientific.net/ddf.312-315.27.

Full text

Abstract:

Cosmic censorship!: black hole wrapped up by its entropy and hidden by its event horizon. In this paper, we postulate a metric to solve the Einstein equations of general relativity, which predicts the thermodynamic behavior of a gigantic mass that collapses to a black hole; taking into account the third law of thermodynamics that states that neither physical process can produce a naked singularity. However, under certain conditions, the model allows to evident violation to the cosmic censorship, exposing the hole nakedness. During the collapse of the hole, quantum effects appear: the area decrease and radiation produced has a high entropy, so that increases total entropy and expose the presence of the hole, while the appearance of the event horizon hide the singularity of the exterior gazes. It is verified that in certain circumstances, the model predicts that the hole mass is bigger than its angular momentum; and in all circumstances, this predicts an hole with enormous superficial graveness that satisfy a relationship of the three parameters that describe the hole (mass, charge and angular momentum); factors all indicative that the singularity is not naked. Then, there are no apparent horizons in accord with cosmic censorship conjecture. Even though the surface gravity of the hole prevents destroying its horizon wrapping singularity, there exists evidence of this singularity by the results of the spin-mass relationship and the escape velocity obtained. The lost information and the slow rate of rotation of the semi-major axis of the mass (dragging space and time around itself as it rotates), agree with Einstein's prediction, show the transport of energy through heat and mass transfer, which were measured by entropy of the hole by means of coordinated semi-spherical that include the different types of intrinsic energy to the process of radiation of the hole event horizon.

APA, Harvard, Vancouver, ISO, and other styles

43

SADHU, AMRUTA, and VARDARAJAN SUNEETA. "A NAKED SINGULARITY STABLE UNDER SCALAR FIELD PERTURBATIONS." International Journal of Modern Physics D 22, no. 04 (March 2013): 1350015. http://dx.doi.org/10.1142/s0218271813500156.

Full text

Abstract:

We prove the stability of a spacetime with a naked singularity under scalar field perturbations, where the perturbations are regular at the singularity. This spacetime, found by Janis, Newman and Winicour and independently by Wyman, is sourced by a massless scalar field and also arises as a certain limit of a class of charged dilatonic solutions in string theory. This stability result opens up specific questions for investigation related to the cosmic censorship conjecture and the mechanism by which it is implemented in nature.

APA, Harvard, Vancouver, ISO, and other styles

44

GHOSH, SUSHANT G., and N. N. SASTE. "GRAVITATIONAL COLLAPSE OF SPHERICAL STRING FLUIDS." International Journal of Modern Physics D 13, no. 02 (February 2004): 263–72. http://dx.doi.org/10.1142/s0218271804004566.

Full text

Abstract:

We discuss the spherical collapse of a two fluid system: a string fluid and a null fluid described by a generalized Vaidya metric. This led us to explicitly describe the effect of a string fluid on the established picture of a null fluid collapse (Vaidya collapse). It is found that there is a shrinkage of the initial data space for naked singularities of Vaidya collapse upon taking into account a string fluid. The implications of the results in the context of the cosmic censorship conjecture are discussed.

APA, Harvard, Vancouver, ISO, and other styles

45

GHOSH, S. G. "INHOMOGENEOUS DUST COLLAPSE WITH COSMOLOGICAL CONSTANT." International Journal of Modern Physics D 14, no. 03n04 (April 2005): 707–15. http://dx.doi.org/10.1142/s0218271805006456.

Full text

Abstract:

We investigate the occurrence of naked singularities in the gravitational collapse of an inhomogeneous dust cloud in an expanding de Sitter background — a piece of Tolman–Bondi–de Sitter space–time. It turns out that the collapse proceed in the same way as in the Minkowski background, i.e., the strong curvature naked singularities form and thus violate the cosmic censorship conjecture. Our result unambiguously support the fact that the asymptotic flatness of space–time is not a necessary ingredient for the development of naked singularities.

APA, Harvard, Vancouver, ISO, and other styles

46

Zeng, Xiao-Xiong, Yi-Wen Han, and De-You Che. "Thermodynamics and weak cosmic censorship conjecture of BTZ black holes in extended phase space." Chinese Physics C 43, no. 10 (September 23, 2019): 105104. http://dx.doi.org/10.1088/1674-1137/43/10/105104.

Full text

APA, Harvard, Vancouver, ISO, and other styles

47

Schiffer, M. "Naked singularities cannot be observed (An information-theoretic approach to the cosmic censorship conjecture)." General Relativity and Gravitation 25, no. 2 (February 1993): 197–204. http://dx.doi.org/10.1007/bf00758827.

Full text

APA, Harvard, Vancouver, ISO, and other styles

48

DOTTI, GUSTAVO, REINALDO J. GLEISER, JORGE PULLIN, IGNACIO F. RANEA-SANDOVAL, and HÉCTOR VUCETICH. "INSTABILITIES OF NAKED SINGULARITIES AND BLACK HOLE INTERIORS IN GENERAL RELATIVITY." International Journal of Modern Physics A 24, no. 08n09 (April 10, 2009): 1578–82. http://dx.doi.org/10.1142/s0217751x09045030.

Full text

Abstract:

Metrics representing black holes in General Relativity may exhibit naked singularities for certain values of their parameters. This is the case for super-extremal (J2 > M > 0) Kerr and super-extremal (|Q| > M > 0) Reissner-Nördstrom spacetimes, and also for the negative mass Schwarzschild spacetime. We review our recent work where we show that these nakedly singular spacetimes are unstable under linear gravitational perturbations, a result that supports the cosmic censorship conjecture, and also that the inner stationary region beyond the inner horizon of a Kerr black hole (J2 < M) is linearly unstable.

APA, Harvard, Vancouver, ISO, and other styles

49

GHOSH, S. G., D. W. DESHKAR, and N. N. SASTE. "FIVE-DIMENSIONAL DUST COLLAPSE WITH COSMOLOGICAL CONSTANT." International Journal of Modern Physics D 16, no. 01 (January 2007): 53–64. http://dx.doi.org/10.1142/s0218271807009309.

Full text

Abstract:

We study the five-dimensional spherical collapse of an inhomogeneous dust in the presence of a positive cosmological constant. The general interior solutions, in the closed form, of the Einstein field equations, i.e. the 5D Tolman–Bondi–de Sitter, is obtained which in turn is matched to the exterior 5D Schwarzschild–de Sitter. It turns out that the collapse proceeds in the same way as in the Minkowski background, i.e. the strong curvature naked singularities form and thus violate the cosmic censorship conjecture. A brief discussion on the causal structure singularities and horizons is also given.

APA, Harvard, Vancouver, ISO, and other styles

50

Zeng, Xiao-Xiong, Xin-Yun Hu, and Ke-Jian He. "Weak cosmic censorship conjecture with pressure and volume in the Gauss-Bonnet AdS black hole." Nuclear Physics B 949 (December 2019): 114823. http://dx.doi.org/10.1016/j.nuclphysb.2019.114823.

Full text

APA, Harvard, Vancouver, ISO, and other styles

We offer discounts on all premium plans for authors whose works are included in thematic literature selections. Contact us to get a unique promo code!