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. [72] Dymnikova I. "Regular Black Hole in General Relativity Coupled to Nonlinear Electrodynamics". 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. Sabine Hossenfelder. 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. Grav. Ayn-Beato, Eloy; Garca, Alberto (8 June 1998). J. Lett. The question of the existence of black holes described by nonsingular models remains open. by imposing the null energy condition on the 3-brane for a bulk having non . 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. 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. Nonsingular black hole models and Outline of astronomy Collapse 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. Explore contextually related video stories in a new eye-catching way. In this way, a Schwarzschild-sized bound state of closed . By Matt Visser. 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. [1][2] This solution does not solve the information paradox, however. This page was last edited on 24 October 2022, at 03:16. 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] . 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 . We describe a possible generalization of a nonsingular black-hole metric to the case when this equality is violated. 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. 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. This requires an accurate theory of black hole formation, of which several have been proposed. 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. Starting with a nonrotating LQG black hole as a seed metric, we construct a rotating spacetime using the revised Newman-Janis algorithm. 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. 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. For example do you know that the gravastar picture does only work when there is a phase transition of the vacuum-state? [1][2] This solution does not solve the information paradox, however. Over the lifetime, 1567 publication(s) have been published within this topic receiving 56246 citation(s). Production and decay of evolving horizons. 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 . 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. 3 relations. 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. 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 . "Formation and evaporation of non-singular black holes". 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. 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. 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. 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 . Our results are novel although consistent with many other investigations of models of nonsingular black holes. Andrew Hamilton, one of the leading experts in GRT goes into detail about this misbeliev on his page [2]. This Paper. Most of them hate things like black holes but most of them have no idea of general relativity, too. 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. By Valerio Faraoni. The metric was written down by Sean Hayward as the minimal model that is regular, static, spherically symmetric and asymptotically flat. . A nonsingular black hole solution of the theory is obtained and its physical interpretation is discussed. Crossref Google Scholar [73] Dymnikova Irina 2004 Regular electrically charged structures in nonlinear electrodynamics coupled to general relativity Class. 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 . Non-Singular Black Holes 13 May 2013 Jrn Wilms (Tbingen) et al. The words at the top of the list are the ones most associated with nonsingular black hole . [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. I would like to include more summary articles and less scientific papers. Quant. 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 ). 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. Nonsingular black hole models is a(n) research topic. Download Download PDF. . After testing the validity of the approximate signal-to-noise ratio (SNR) calculation for different space based interferometers, we discuss the SNR of . George Chapline (1998), "The Black Hole Information Puzzle and Evidence for a Cosmological Constant". 1992 Vacuum nonsingular black hole Gen. Rel. They come up with crazy ideas which has nothing to do with real science. A number of works in the direction of nonsingular models were criticized and rejected. Hayward, Sean A. SamuelRiv 23:41, 4 November 2007 (UTC) [ reply] Please see the new comments about alternative black hole models in the main talk. 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. Testing Astrophysical Models of the Galactic Center Black Hole Astrophys. I have modified the last abstract. pgw bill pay as guest mortal kombat harem wattpad http ultra box club c 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. "Non-singular general relativistic gravitational collapse". 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. 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. Hi SamuelRiv, The two-dimensional theory is also used to model the evaporation process of the near-extremal four-dimensional black hole. [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. [citation needed]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. Download Unionpedia on your Android device! Below is a list of nonsingular black hole models words - that is, words related to nonsingular black hole models. Try Combster now! This page was created based on discussions from Black_hole#Alternative_models on Talk: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. Avoiding paradoxes in the standard black hole model. 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. Nevertheless, the existence of a stable model of a nonsingular black hole is still an open question. "Electrically charged black holes in linear and nonlinear electrodynamics: Geodesic analysis and scalar absorption". The metric was written down by Sean Hayward as the minimal model that is regular, static, spherically symmetric and asymptotically flat. Evolving Black Hole Horizons in General Relativity and Alternative Gravity. The root cause of all black holesbe they tiny primordial black holes, solar mass black holes, or supermassive galactic black holesis gravity. The Hayward metric is the simplest description of a black hole that is non-singular. 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. This proposal is fundamentally wrong. Ayn-Beato, Eloy; Garca, Alberto (9 November 2000). The basic model of a black hole can be summed up as follows: gravity wins. [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. 2010. Communication . 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. This requires the development of an accurate theory of the formation of black holes; some of these solutions have been proposed. Good. 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. 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