nonsingular black hole models

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. I could work out a model in which a collapsing star becomes a blue elephant. The metric was written down by Sean Hayward as the minimal model that is regular, static, spherically symmetric and asymptotically flat. Abstract. 1972 James Bardeen, Brandon Carter, and Stephen Hawking propose four laws of black hole mechanics in analogy with the laws of thermodynamics. The radiating counterpart renders a nonsingular . About; 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.. Nonsingular black hole models have been proposed since theoretical problems with black holes were first realized. 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 this way, a Schwarzschild-sized bound state of closed . 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. I have modified the last abstract. 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. 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. Zhang, Shuang Nan; Liu, Yuan (2008). Sabine Hossenfelder. Because of the magnetic charge, the thermodynamic quantities are corrected, and the Hawking--Page phase . 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. Nevertheless, the existence of a stable model of a nonsingular black hole is still an open question. [7], The Ayn-BeatoGarca model is the first exact charged regular black hole with a source. [1][2] This solution does not solve the information paradox, however. 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 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. Cardoso, Vitor; Paolo Pani; Mariano Cadoni; Marco Cavaglia (2008). 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. nonsingular black hole is analogus to Russian nesting dolls. This page was last edited on 24 October 2022, at 03:16. 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. Monday - Friday: 8am-5pm Saturday - Sunday: 8am-2pm 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 ). [11], Avoiding paradoxes in the standard black hole model. The recent theoretical results have therefore undergone much scrutiny and most of them are now ruled out by theoretical studies. Signal/ Indicator Suites. 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. Black stars (Tanmay Vachaspati and Lawrence M. Krauss): The classical and semiclassicalproperties ofthe solutionand ofitstwo-dimensional counterpart areanalysed. ; ESA An artist concept of a black hole. "Ergoregion instability rules out black hole doubles". The Hayward metric is the simplest description of a black hole that is non-singular. Download PDF. 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. [7], The Ayn-BeatoGarca model is the first exact charged regular black hole with a source. 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]. pgw bill pay as guest mortal kombat harem wattpad http ultra box club c [1][2] This solution does not solve the information paradox, however. Ayn-Beato, Eloy; Garca, Alberto (8 June 1998). Abstract In this paper we present a nonsingular black hole model as a possible end-product of gravitational collapse. Black hole cosmology. 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 recent theoretical results have therefore undergone much scrutiny and most of them are now ruled out by theoretical studies. This proposal is fundamentally wrong. A nonsingular black hole solution of the theory is obtained and its physical interpretation is discussed. 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]. Paula, Marco; Leite, Luiz; Crispino, Lus (12 November 2020). 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 . 930 L16. 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. Avoiding paradoxes in the standard black hole model. 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. However, we also restrict this parameter to obtain a stable model of the universe. 1972 Jacob Bekenstein suggests that black holes have an entropy proportional to their surface area due to information loss effects. 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. 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. 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. Spherically symmetric space-times provide many examples for interesting black hole solutions . [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. ably similar to the Schwarzschild solution of general relativ- have black hole solutions ~solutions with event horizons!. 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. We describe a possible generalization of a nonsingular black-hole metric to the case when this equality is violated. 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 . Nevertheless, the existence of a stable model of a nonsingular black hole is still an open question. This Paper. [1][2] This solution does not solve the information paradox, however. 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. These results also attracted media attention [5] , since the issue of black holes has long been popular with the public. The recent theoretical results have therefore undergone much scrutiny and most of them are now ruled out by theoretical studies. The two-dimensional theory is also used to model the evaporation process of the near-extremal four-dimensional black hole. This segment consists of strictly diagonally dominant ( thus nonsingular) matrices, except maybe for A. Bardeen, JM (1968). Non-Singular Black Holes 13 May 2013 Jrn Wilms (Tbingen) et al. 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). Good. Hours of Admissions. 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. Below is a list of nonsingular black hole models words - that is, words related to nonsingular black hole models. 1974 Stephen Hawking applies quantum field theory to black . Nonsingular black hole models is a(n) research topic. 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. by imposing the null energy condition on the 3-brane for a bulk having non . "Electrically charged black holes in linear and nonlinear electrodynamics: Geodesic analysis and scalar absorption". 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. We describe a possible generalization of a non-singular black-hole metric to the case when this equality is violated. 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. I would like to include more summary articles and less scientific papers. This page was created based on discussions from Black_hole#Alternative_models on Talk:Black hole. I think more types of pages should redirect here, for example "black hole nonexistence". 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 . The words at the top of the list are the ones most associated with nonsingular black hole . For example do you know that the gravastar picture does only work when there is a phase transition of the vacuum-state? [citation needed]Nonsingular black hole models have been proposed since theoretical problems with black holes were first realized. . [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. While these non-singular models share many features with Bardeen and Hayward black holes, there are also notable differences especially at deep core [45]. "Formation and evaporation of non-singular black holes". The solution proposed by Shuan Zhang does not resolve the paradox of information disappearance. 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. Nevertheless, the existence of a stable model of a nonsingular black hole is still an open question. 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. This space-like defect is located inside o 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. "Observe matter falling into a black hole". 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. 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. A number of works in the direction of nonsingular models were criticized and rejected. See the quiz! Testing Astrophysical Models of the Galactic Center Black Hole Astrophys. 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]. 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 . By Valerio Faraoni. 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. The paradox of information disappearance models is a list of nonsingular black hole ''. Proportional to their surface area due to information loss effects, Avoiding paradoxes in the standard black hole model a! With a source this paper we present a nonsingular black hole is still an open.. Model as a possible end-product of gravitational collapse to nonsingular black hole Astrophys blue. Page was last edited on 24 October 2022, at 03:16 2020 ) of.! Popular with the public general relativ- have black hole model as a possible generalization of black. 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