nonsingular black hole models

Because of the magnetic charge, the thermodynamic quantities are corrected, and the Hawking--Page phase . [7], The Ayn-BeatoGarca model is the first exact charged regular black hole with a source. Download Download PDF. 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. The question of the existence of black holes described by nonsingular models remains open. 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. 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. The U.S. Department of Energy's Office of Scientific and Technical Information The Hayward metric is the simplest description of a black hole that is non-singular. SamuelRiv 23:41, 4 November 2007 (UTC) [ reply] Please see the new comments about alternative black hole models in the main talk. gmrs ghost antenna guard dawg keyless ignition for indian scout a body is projected from the ground with a speed u [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. This requires an accurate theory of black hole formation, of which several have been proposed. [7], The Ayn-BeatoGarca model is the first exact charged regular black hole with a source. This requires the development of an accurate theory of the formation of black holes; some of these solutions have been proposed. "Observe matter falling into a black hole". ; ESA An artist concept of a black hole. 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. While black holes were a well-established part of mainstream physics for most of the end of the 20th century, alternative models received new attention when models proposed by George Chapline and later by Lawrence Krauss, Dejan Stojkovic, and Tanmay Vachaspati of Case Western Reserve University showed in several separate models that black hole horizons could not form.[3][4]. [1][2] This solution does not solve the information paradox, however. This page was created based on discussions from Black_hole#Alternative_models on Talk:Black hole. This segment consists of strictly diagonally dominant ( thus nonsingular) matrices, except maybe for A. [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. As we shall see, the maximal curva- Over the lifetime, 1567 publication(s) have been published within this topic receiving 56246 citation(s). https://en.wikipedia.org/w/index.php?title=Talk:Nonsingular_black_hole_models&oldid=410159268, This page was last edited on 26 January 2011, at 12:51. For example do you know that the gravastar picture does only work when there is a phase transition of the vacuum-state? While these non-singular models share many features with Bardeen and Hayward black holes, there are also notable differences especially at deep core [45]. 24 235-242. Grav. Below is a list of nonsingular black hole models words - that is, words related to nonsingular black hole models. We employ a probability distribution inspired mass function m ( r) to replace the Kerr black hole mass M to represent a nonsingular rotating black hole that is identified asymptotically ( r \gg k, k>0 constant) exactly as the Kerr-Newman black hole, and as the Kerr black hole when k=0. 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. Nonsingular black hole models have been proposed since theoretical problems with black holes were first realized. We describe a possible generalization of a nonsingular black-hole metric to the case when this equality is violated. ity. 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. Evolving Black Hole Horizons in General Relativity and Alternative Gravity. Black stars (Tanmay Vachaspati and Lawrence M. Krauss): 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). Nonsingular black hole models is a(n) research topic. Correspondence between phases of black membranes wrapped on a two-torus of side L (left) and quickly-rotating MP black holes with rotation parameter a L r 0 (right: must be rotated along a vertical axis): (i) uniform black membrane and MP black hole; (ii) nonuniform black membrane and pinched black hole; (iii) pinched-off membrane and . We also obtain a metric for a charged non-singular black hole obeying similar restrictions as the neutral one, and construct higher dimensional models of neutral and charged black holes. The recent theoretical results have therefore undergone much scrutiny and most of them are now ruled out by theoretical studies. About; 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. Explore contextually related video stories in a new eye-catching way. For example, with respect to some nonsingular models, it was shown that such black holes will be unstable during extremely fast rotation [6] , and while maintaining the angular momentum , will not be described by the usual scenario of a collapsing star (see pulsar ). Such models were originally proposed by theoretical physicist Raj Pathria, [1] and concurrently by mathematician I. J. 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. Cardoso, Vitor; Paolo Pani; Mariano Cadoni; Marco Cavaglia (2008). 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 . Quant. Avoiding paradoxes in the standard black hole model. Paula, Marco; Leite, Luiz; Crispino, Lus (12 November 2020). Download Unionpedia on your Android device! 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 . (26 January 2006). George Chapline (1998), "The Black Hole Information Puzzle and Evidence for a Cosmological Constant". The radiating counterpart renders a nonsingular . They come up with crazy ideas which has nothing to do with real science. . [8] The model was proposed by Eloy Ayn Beato and Alberto Garca in 1998 based on the minimal coupling between a nonlinear electrodynamics model and general relativity, considering a static and spherically symmetric spacetime. 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). 1972 James Bardeen, Brandon Carter, and Stephen Hawking propose four laws of black hole mechanics in analogy with the laws of thermodynamics. 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. Abstract. I have modified the last abstract. While black holes were a well-established part of mainstream physics for most of the end of the 20th century, alternative models received new attention when models proposed by George Chapline and later by Lawrence Krauss, Dejan Stojkovic, and Tanmay Vachaspati of Case Western Reserve University showed in several separate models that black hole horizons could not form.[3][4]. 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. Abstract In this paper we present a nonsingular black hole model as a possible end-product of gravitational collapse. "Formation and evaporation of non-singular black holes". 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. 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 investigate how the resolution of the singularity problem for the Schwarzschild black hole could be related to the presence of quantum gravity effects at horizon scales. 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. [8] The model was proposed by Eloy Ayn Beato and Alberto Garca in 1998 based on the minimal coupling between a nonlinear electrodynamics model and general relativity, considering a static and spherically symmetric spacetime. Bardeen, JM (1968). However, we also restrict this parameter to obtain a stable model of the universe. 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 . Nonsingular black hole models have been proposed since theoretical problems with black holes were first realized. 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. 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. 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.. 1972 Jacob Bekenstein suggests that black holes have an entropy proportional to their surface area due to information loss effects. By Valerio Faraoni. This Paper. "Ergoregion instability rules out black hole doubles". "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. In this way, a Schwarzschild-sized bound state of closed . Hayward, Sean A. 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. Try Combster now! There is as of today no physical theory which forecast such a phase-transition. by imposing the null energy condition on the 3-brane for a bulk having non . These results also attracted media attention [5] , since the issue of black holes has long been popular with the public. This space-like defect is located inside o For a black hole to physically exist as a solution to Einstein's equation, it must form an event horizon in finite time relative to outside observers. Hours of Admissions. 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 After that he re-emerges in the near horizon region of a . Our results are novel although consistent with many other investigations of models of nonsingular black holes. 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 . 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. RSI Strategy Suite for MultiCharts - The RSI Strategy Suite for MultiCharts offers a primary RSI -based PowerLanguage formula , along with accessory formulas , that together implement a collection of analysis, visualization, presentation, and optimization techniques to create a complete solution for 4-line indicator. Nonsingular black hole models have been proposed since theoretical problems with black holes were first realized. Nevertheless, the existence of a stable model of a nonsingular black hole is still an open question. Later the same authors reinterpreted the first non-singular black hole geometry, the Bardeen toy Model,[9] as a nonlinear-electrodynamics-based regular black hole. Full PDF Package Download Full PDF Package. Nonsingular black hole models have been proposed since theoretical problems with black holes were first realized. Nonsingular black hole models have been proposed since theoretical problems with black holes were first realized. Zhang, Shuang Nan; Liu, Yuan (2008). The depicted spacetime which is type [II, (II)], by Petrov classification, is an exact solution of the Einstein equations and contains two horizons. The root cause of all black holesbe they tiny primordial black holes, solar mass black holes, or supermassive galactic black holesis gravity. [11], Avoiding paradoxes in the standard black hole model. 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 . This proposal is fundamentally wrong. The answer to your first question is what you've written: there is an equivalence of categories $$\{\textrm{f.g. field extensions }K/k\textrm{ with }\operatorname{trdeg}_k K = 1\}\simeq\{\textrm{nonsingular projective curves }C/k\}$$ (see theorem 50.2.6 here).When people use the description of an affine curve to refer to a nonsingular projective curve, they typically mean "the nonsingular . By Matt Visser. SamuelRiv 19:17, 3 November 2007 (UTC). Moreover gravastars are not stable under rotation so as an astrophysical object they are ruled out. Non-Singular Black Holes 13 May 2013 Jrn Wilms (Tbingen) et al. [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. Avoiding paradoxes in the standard black hole model, "Witnessing matter falling into a black hole by a distant observer", Black holes don't exist, Case physicists report, Magnetospheric eternally collapsing object, https://infogalactic.com/w/index.php?title=Nonsingular_black_hole_models&oldid=704978721, Last edited on 14 February 2016, at 19:11, Creative Commons Attribution-ShareAlike License. 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. This requires an accurate theory of black hole formation, of which several have been proposed. 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. The two-dimensional theory is also used to model the evaporation process of the near-extremal four-dimensional black hole. 3 relations. 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. 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. pgw bill pay as guest mortal kombat harem wattpad http ultra box club c A number of works in the direction of nonsingular models were criticized and rejected. 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. [11], Avoiding paradoxes in the standard black hole model, "Witnessing matter falling into a black hole by a distant observer", "The Bardeen model as a nonlinear magnetic monopole", Black holes don't exist, Case physicists report, Magnetospheric eternally collapsing object, https://en.wikipedia.org/w/index.php?title=Nonsingular_black_hole_models&oldid=1118967044, Articles with dead external links from January 2018, Articles with permanently dead external links, Articles with unsourced statements from March 2008, Creative Commons Attribution-ShareAlike License 3.0, This page was last edited on 30 October 2022, at 00:56. We calculate gravitational perturbation quasinormal modes (QNMs) of nonsingular Bardeen black holes (BHs) and singularity-free BHs in conformal gravity and examine their spectra in wave dynamics comparing with standard BHs in general relativity. . 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] . Monday - Friday: 8am-5pm Saturday - Sunday: 8am-2pm 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. 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 . See this blog [1] from a string theorist point of view. Signal/ Indicator Suites. 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. 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. 2010. "Regular Black Hole in General Relativity Coupled to Nonlinear Electrodynamics". 1974 Stephen Hawking applies quantum field theory to black . Nevertheless, the existence of a stable model of a nonsingular black hole is still an open question. [citation needed]Nonsingular black hole models have been proposed since theoretical problems with black holes were first realized. 930 L16. I think more types of pages should redirect here, for example "black hole nonexistence". Model for nonsingular black hole collapse and evaporation. The recent theoretical results have therefore undergone much scrutiny and most of them are now ruled out by theoretical studies. Starting with a nonrotating LQG black hole as a seed metric, we construct a rotating spacetime using the revised Newman-Janis algorithm. The metric was written down by Sean Hayward as the minimal model that is regular, static, spherically symmetric and asymptotically flat. Property Value; dbo:abstract: [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. After testing the validity of the approximate signal-to-noise ratio (SNR) calculation for different space based interferometers, we discuss the SNR of . 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]. Hi SamuelRiv, We investigate the possibility of obtaining non-singular black-hole solutions in the brane world model by solving the effective field equations for the induced metric on the brane. For a black hole to physically exist as a solution to Einstein's equation, it must form an event horizon in finite time relative to outside observers. 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. As a consequence the quantum back reaction is negligible. Preceding unsigned comment added by 212.201.71.52 (talk) 21:53, 16 February 2008 (UTC). For a black hole to physically exist as a solution to Einstein's equation, it must form an event horizon in finite time relative to outside observers. Good. For a black hole to physically exist as a solution to Einstein's equation, it must form an event horizon . [2] The Reissner-Nordstrom solution on the brane was obtained by Dadhich et al. 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. Later the same authors reinterpreted the first non-singular black hole geometry, the Bardeen toy Model,[9] as a nonlinear-electrodynamics-based regular black hole. The Hayward metric is the simplest description of a black hole that is non-singular. While black holes were a well-established part of mainstream physics for most of the end of the 20th century, alternative models received new attention when models proposed by George Chapline and later by Lawrence Krauss, Dejan Stojkovic, and Tanmay Vachaspati of Case Western Reserve University showed in several separate models that black hole horizons could not form.[3][4]. 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. In other words, a falling object causes an expansion of the event horizon of the black hole, which occurs only after the object fell into the black hole, which allows observing the event horizon at a finite time [1] [2] . The basic model of a black hole can be summed up as follows: gravity wins. Contents. 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. J. Lett. Crossref Google Scholar [73] Dymnikova Irina 2004 Regular electrically charged structures in nonlinear electrodynamics coupled to general relativity Class. [1][2] This solution does not solve the information paradox, however. [72] Dymnikova I. ASJC Scopus subject areas Nuclear and High Energy Physics 1992 Vacuum nonsingular black hole Gen. Rel. See the quiz! "Non-singular general relativistic gravitational collapse". ably similar to the Schwarzschild solution of general relativ- have black hole solutions ~solutions with event horizons!. Namely, after falling into the black hole of radius $r_{g}$, an observer, instead of being destroyed at the singularity, gets for a short time into the region with limiting curvature. A nonsingular black hole solution of the theory is obtained and its physical interpretation is discussed. The words at the top of the list are the ones most associated with nonsingular black hole . 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 . Sabine Hossenfelder. Black hole cosmology. Spherically symmetric space-times provide many examples for interesting black hole solutions . Communication . 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. Following a general program, space-like singularities in spherically symmetric quantum geometry, as well as other inhomogeneous models, are shown to be absent and one sees how the classical reduction from infinitely many kinematical degrees of freedom to only one physical one, the mass, can arise. 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.. The solution proposed by Shuan Zhang does not resolve the paradox of information disappearance. The topic is also known as: nonsingular black hole model. It is shown in particular that a large negative pressure in the framework of classical GR translates into a large positive pressure once quantum physics is incorporated. The Hayward metric is the simplest description of a black hole which is non-singular.The metric was written down by Sean Hayward as the minimal model which is regular, static, spherically symmetric and asymptotically flat. Ayn-Beato, Eloy; Garca, Alberto (8 June 1998). I would like to include more summary articles and less scientific papers. 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.

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