ity. See the quiz! Motivated by the analogy with the cosmological Schwarzschild-de Sitter solution, we construct a broad class of nonsingular, static, asymptotically flat black-hole solutions with a de Sitter (dS) core, sourced by an . Crossref Google Scholar [73] Dymnikova Irina 2004 Regular electrically charged structures in nonlinear electrodynamics coupled to general relativity Class. The classical and semiclassicalproperties ofthe solutionand ofitstwo-dimensional counterpart areanalysed. However, we also restrict this parameter to obtain a stable model of the universe. The recent theoretical results have therefore undergone much scrutiny and most of them are now ruled out by theoretical studies. Unlike CGHS, the modified models are non-singular and Of the four fundamental interactions in nature, gravity is geodesically complete. The top 4 are: black holes, black hole information paradox, gravastar and event horizon.You can get the definition(s) of a word in the list below by tapping the question-mark icon next to it. The topic is also known as: nonsingular black hole model. Preceding unsigned comment added by 212.201.74.10 (talk) 17:08, 4 November 2007 (UTC), If you want to know more about this than you must search (on arxiv or elswhere) for dynamical-, slowly evolving- and trapped- horizons for a better understanding of realistic black holes. They come up with crazy ideas which has nothing to do with real science. To let you know my bias, I have seen talks by all four scientists mentioned here and must say that, without being a GR specialist, I believe them, and I believe that these new models easily meet criteria for notability necessary to create a separate page. Paula, Marco; Leite, Luiz; Crispino, Lus (12 November 2020). Today some of the most viable candidates for the result of the collapse of a star with mass well above the Chandrasekhar limit include the gravastar and the dark energy star. Model for nonsingular black hole collapse and evaporation. [1][2] This solution does not solve the information paradox, however. Regarding the Hawking evaporation process, the intriguing new feature is that the black hole is allowed to reach only a finite maximum temperature, before cooling down to an absolute zero extremal state. We present an exact nonsingular black hole solution in the $4D$ EGB gravity coupled to non-linear electrodynamics and analyze their thermodynamic properties to calculate precise expressions for the black hole mass, temperature, and entropy. Nonsingular black hole models have been proposed since theoretical problems with black holes were first realized. [citation needed] Today some of the most viable candidates for the result of the collapse of a star with mass well above the Chandrasekhar limit include the gravastar and the dark energy star. Non-singular black hole models are mathematical theories describing black holes without the occurrence of paradoxes that arise in the standard black hole model, including the paradoxes of the disappearance of information and the unobservability of the black hole event horizon . These results also attracted media attention [5] , since the issue of black holes has long been popular with the public. Hi SamuelRiv, SamuelRiv 23:41, 4 November 2007 (UTC) [ reply] Please see the new comments about alternative black hole models in the main talk. A nonsingular black hole model is a mathematical theory of black holes that avoids certain theoretical problems with the standard black hole model, including information loss and the unobservable nature of the black hole event horizon. Avoiding paradoxes in the standard black hole model. This page was created based on discussions from Black_hole#Alternative_models on Talk:Black hole. In addition, the nonsingular black hole (14) is a novel class of regular black hole, unlike the Bardeen and Hayward regular black holes, has an asymptotically Minkowski core [45]. Today some of the most viable candidates for the end result of the collapse of a star with mass well above the Chandrasekhar limit include the gravastar and the dark energy star. Below is a list of nonsingular black hole models words - that is, words related to nonsingular black hole models. Because of the magnetic charge, the thermodynamic quantities are corrected, and the Hawking--Page phase . While these non-singular models share many features with Bardeen and Hayward black holes, there are also notable differences especially at deep core [45]. At present, several models have been developed to describe the collapse of stars with a mass significantly exceeding the Chandrasekhar limit , including a gravastar and a dark energy star . At present, several models have been developed to describe the collapse of stars with a mass significantly exceeding the Chandrasekhar limit, including a gravastar and a dark energy star.. This was absolute necessary because these alternative models are not worth to be regarded as serios alternatives and a reader with no deeper physical backround would not be able to notice that. Alternative models of black holes attracted attention when , and later Lawrence Krauss, Dejan Stojkovic and Tenmey Vachaspati from the Case Western University reserve showed that in some models the black . In order for a black hole, as a solution of Einstein's equations , to really exist, it must form an event horizon in a time finite for an external observer. By Valerio Faraoni. This Paper. Nevertheless, the existence of a stable model of a nonsingular black hole is still an open question. 24 235-242. For example do you know that the gravastar picture does only work when there is a phase transition of the vacuum-state? A nonsingular black hole model is a mathematical theory of black holes that avoids certain theoretical problems with the standard black hole model, including information loss and the unobservable nature of the black hole event horizon. We obtain exact solutions to the field equations for five-dimensional locally rotationally symmetric (LRS) Bianchi type-I spacetime in the f(R,T) theory of gravity, where specifically, the following three cases are considered: (i) f(R,T)=(R+T), (ii) f(R,T)=R . In other words, an infalling object causes the horizon of a black hole to expand, which only occurs after the object has fallen into the hole, allowing an observable horizon in finite time. For a black hole to physically exist as a solution to Einstein's equation, it must form an event horizon . In particular, in 2007, Shuan Nan Zhang from Tsinghua University proposed a model in which the event horizon of a potential black hole is formed (or expanded) only after the falling object reaches the existing horizon, or after the horizon exceeds the critical density . Download Unionpedia on your Android device! Such models were originally proposed by theoretical physicist Raj Pathria, [1] and concurrently by mathematician I. J. [72] Dymnikova I. In 2007, Shuan Nan Zhang of Tsinghua University proposed a model in which the event horizon of a potential black hole only forms (or expands) after an object falls into the existing horizon, or after the horizon has exceeded the critical density. Nonsingular black hole models have been proposed since theoretical problems with black holes were first realized. Hayward, Sean A. Abhas Mitra (2005), "Comments on the proposal of Dark Energy Stars by Chapline", https://ru.wikipedia.org/w/index.php?title=Non-singular_ black hole models&oldid, Witnessing matter falling into a black hole by a distant observer, Black holes don't exist, Case physicists report. Our results are novel although consistent with many other investigations of models of nonsingular black holes. Nonsingular black hole models have been proposed since theoretical problems with black holes were first realized. pgw bill pay as guest mortal kombat harem wattpad http ultra box club c There is nothing to talk about. A black hole cosmology (also called Schwarzschild cosmology or black hole cosmological model) is a cosmological model in which the observable universe is the interior of a black hole. I was the one who wrote the little paragraph about "Alternative black hole models" and I would like to tell you a little bit more about the models of the scientist negating the existence of black holes. A nonsingular black hole model is a mathematical theory of black holes that avoids certain theoretical problems with the standard black hole model, including information loss and the unobservable nature of the black hole event horizon. Most of them hate things like black holes but most of them have no idea of general relativity, too. Signal/ Indicator Suites. This is due to the fact that the scientist confound the fact that an asymptotic observer will never see a signal from the event horizon due to the space-time curvature with the misbeliev that it takes an infinite amount of time for horizon formation. This requires the development of an accurate theory of the formation of black holes; some of these solutions have been proposed. by imposing the null energy condition on the 3-brane for a bulk having non . gmrs ghost antenna guard dawg keyless ignition for indian scout a body is projected from the ground with a speed u This page was last edited on 24 October 2022, at 03:16. The Reissner-Nordstrom solution on the brane was obtained by Dadhich et al. "Formation and evaporation of non-singular black holes". Nevertheless, the existence of a stable model of a nonsingular black hole is still an open question. Property Value; dbo:abstract: 1974 Stephen Hawking applies quantum field theory to black . A nonsingular black hole solution of the theory is obtained and its physical interpretation is discussed. Spherically symmetric space-times provide many examples for interesting black hole solutions . George Chapline (1998), "The Black Hole Information Puzzle and Evidence for a Cosmological Constant". Non-Singular Black Holes 13 May 2013 Jrn Wilms (Tbingen) et al. The radiating counterpart renders a nonsingular . Download Citation | On Jul 18, 2022, M. Cadoni and others published Effective models of nonsingular quantum black holes | Find, read and cite all the research you need on ResearchGate Nevertheless, the existence of a stable model of a nonsingular black hole is still an open question. "Witnessing matter falling into a black hole by a distant observer", http://www.cfa.ustc.edu.cn/meeting/aco/papers/5-7morning/Witnessing%20matter%20falling%20into%20a%20black%20hole-1.ppt, http://www.scienceagogo.com/news/black_hole_redux.shtml, "The Bardeen model as a nonlinear magnetic monopole", https://doi.org/10.1016/S0370-2693(00)01125-4, Black holes don't exist, Case physicists report, Magnetospheric eternally collapsing object, https://handwiki.org/wiki/index.php?title=Astronomy:Nonsingular_black_hole_models&oldid=2219613. . "Electrically charged black holes in linear and nonlinear electrodynamics: Geodesic analysis and scalar absorption". This requires an accurate theory of black hole formation, of which several have been proposed. For example, several alternative black hole models were shown to be unstable in extremely fast rotation,[6] which, by conservation of angular momentum, would be a not unusual physical scenario for a collapsed star (see pulsar). A nonsingular black hole model is a mathematical theory of black holes that avoids certain theoretical problems with the standard black hole model, including information loss and the unobservable nature of the black hole event horizon. This segment consists of strictly diagonally dominant ( thus nonsingular) matrices, except maybe for A. [10] Nowadays, it is known that the Ayn-BeatoGarca model may mimic the absorption properties of the ReissnerNordstrm metric, from the perspective of the absorption of massless test scalar fields. Bardeen, JM (1968). Testing Astrophysical Models of the Galactic Center Black Hole Astrophys. Preceding unsigned comment added by 212.201.74.10 (talk) 17:30, 4 November 2007 (UTC), Please see the new comments about alternative black hole models in the main talk. The metric is not derived from any particular alternative theory of gravity, but provides a framework to test the formation and evaporation of non-singular black holes both . Preceding unsigned comment added by 212.201.71.52 (talk) 21:53, 16 February 2008 (UTC). [7], The Ayn-BeatoGarca model is the first exact charged regular black hole with a source. Nobody would belive me, but the gravastar model is no more scientific because it makes assumptions about the behavior of the space-time which are so unsubstantiated like the blue elephant. Good. About; I could work out a model in which a collapsing star becomes a blue elephant. If Vachaspati and Co. were right, the supermassive black hole at the center of the milky way would evaporate due to "pree-Hawking radiation" within hours- but you know that this is not the case. Try Combster now! Approaches to the development of the theory of the origin of black holes, Observation of Incipient Black Holes and the Information Loss Problem, Ergoregion instability rules out black hole doubles. A number of works in the direction of nonsingular models were criticized and rejected. "Ergoregion instability rules out black hole doubles". We also obtain a metric for a charged nonsingular black hole obeying similar restrictions as the neutral one and construct higher dimensional models of neutral and charged black holes. Today some of the most viable candidates for the result of the collapse of a star with mass well above the Chandrasekhar limit include the gravastar and the dark energy star. Download Download PDF. Abstract In this paper we present a nonsingular black hole model as a possible end-product of gravitational collapse. Zhang, Shuang Nan; Liu, Yuan (2008). There is an explanation why the Krauss model is wrong.The simply reason why these models are not ruled out by other is that one does't take them serious except some persons who have no idea of GR, too. Starting with a nonrotating LQG black hole as a seed metric, we construct a rotating spacetime using the revised Newman-Janis algorithm. Such research has attracted much media attention,[5] as black holes have long captured the imagination of both scientists and the public for both their innate simplicity and mysteriousness. Alternative models of black holes attracted attention when , and later Lawrence Krauss , Dejan Stojkovic and Tenmey Vachaspati from the Case Western University reserve showed that in some models the black hole event horizon cannot form [3] [4] .

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