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Quantum Singularities In Black Hole Spacetime Systems With Timelike Classical Singularities
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Book Synopsis Quantum Singularities in Black Hole Spacetime Systems with Timelike Classical Singularities by : Drew M. Weninger
Download or read book Quantum Singularities in Black Hole Spacetime Systems with Timelike Classical Singularities written by Drew M. Weninger and published by . This book was released on 2019 with total page 150 pages. Available in PDF, EPUB and Kindle. Book excerpt: "General relativity is currently the best theory that describes gravitation, one of the four basic forces of nature. A thorough understanding of general relativity is essential for navigation systems reliant upon GPS to operate with accurate and precise measurements over time. Classical general relativity predicts the existence of irremovable singularities, points in space where a mathematical description of the spacetime "breaks down" due to geodesic incompleteness. These singularities are found in a host of relativistic spacetimes, including those of observable astrophysical objects such as black hole systems. In our study, timelike curvature singularities associated with a group of super-extremal spacetimes are analyzed with a quantum wave packet in place of geodesic incompleteness. In this case, these singularities may be "removed" or "healed" without imposing boundary conditions. The super- extremal spacetimes explored include overcharged and overspinning black hole systems with naked singularities and different assumptions such as penetration by a cosmic string, a higher dimensional universe background, or in expanding or contracting cosmologies. The technique to determine quantum singularities focuses on analysis of the spatial segment of the minimally coupled, relativistic Klein Gordon wave operator for a massive scalar particle and whether it is essentially self-adjoint. Both, Weyl's limit-point, limit-circle criterion and deficiency indices are used to determine self-adjointness. By using self-adjointness properties, the spacetime can be characterized as quantum mechanically singular or non- singular. This method can help in determining the behavior of quantum particles, including the Higgs and other bosons found in spontaneous symmetry breaking models, near a black hole singularity. Our results indicate the quantum wave operator is not essentially self-adjoint for the spherically-symmetric spacetimes and spacetimes with cosmic strings. Hence, they contain quantum singularities. Finally, for a wave packet in the vicinity of a rotating black hole's naked singularity, the wave operator is not essentially-self adjoint indicating quantum singularities exist and the ring singularity is not 'healed'."--from abstract.
Book Synopsis Internal Structure of Black Holes and Spacetime Singularities by : Lior M. Burko
Download or read book Internal Structure of Black Holes and Spacetime Singularities written by Lior M. Burko and published by Institute of Physics Publishing (GB). This book was released on 1997 with total page 552 pages. Available in PDF, EPUB and Kindle. Book excerpt: The physics of black holes and spacetime singularities is now a well established area of research in gravitation theory. Over recent years researchers have begun to study the internal structure of black holes and spacetime singularities. This book is primarily the proceedings of a workshop devoted to the subject. The chapters are mainly written versions of the talks given at the workshop. However, the authors have written extended introductions to their contributions, so that a reader, well versed in gravitation theory, but unaware of the current research in this subfield, should be able to follow the text Several topics are considered by more than one author, bringing into the text different viewpoints on these topics. As a result, this book is suitable for graduate students who wish to familiarize themselves with the various aspects of the structure of black holes, and for researchers who wish to learn about advances in subfields other than their own. Topics covered include: the nature of thesingularities (both null and spacelike) and the spacetime inside black holes coupled to various matter fields in classical and semiclassical gravity, as well as in alternative gravity theories; the cosmic censorship hypothesis and its connection to black hole interiors; cosmological singularities and their relation with black hole singularities; and black hole entropy and evaporation.
Book Synopsis Regular Black Holes by : Cosimo Bambi
Download or read book Regular Black Holes written by Cosimo Bambi and published by Springer Nature. This book was released on 2023-07-06 with total page 505 pages. Available in PDF, EPUB and Kindle. Book excerpt: Black holes are one of the most fascinating predictions of general relativity. They are the natural product of the complete gravitational collapse of matter and today we have a body of observational evidence supporting the existence of black holes in the Universe. However, general relativity predicts that at the center of black holes there are spacetime singularities, where predictability is lost and standard physics breaks down. It is widely believed that spacetime singularities are a symptom of the limitations of general relativity and must be solved within a theory of quantum gravity. Since we do not have yet any mature and reliable candidate for a quantum gravity theory, researchers have studied toy-models of singularity-free black holes and of singularity-free gravitational collapses in order to explore possible implications of the yet unknown theory of quantum gravity. This book reviews all main models of regular black holes and non-singular gravitational collapses proposed in the literature, and discuss the theoretical and observational implications of these scenarios.
Book Synopsis Spacetime Singularities in Quantum Gravity by : Eric Azarian Minassian
Download or read book Spacetime Singularities in Quantum Gravity written by Eric Azarian Minassian and published by . This book was released on 2003 with total page 234 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis The Analysis of Space-Time Singularities by : C. J. S. Clarke
Download or read book The Analysis of Space-Time Singularities written by C. J. S. Clarke and published by Cambridge University Press. This book was released on 1993 with total page 196 pages. Available in PDF, EPUB and Kindle. Book excerpt: The different possible singularities are defined and the mathematical methods needed to extend the space-time are described in detail in this book. Results obtained (many appearing here for the first time) show that singularities are associated with a lack of smoothness in the Riemann tensor.
Book Synopsis 2nd Karl Schwarzschild Meeting on Gravitational Physics by : Piero Nicolini
Download or read book 2nd Karl Schwarzschild Meeting on Gravitational Physics written by Piero Nicolini and published by Springer. This book was released on 2018-09-22 with total page 198 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book presents the proceedings of the 2nd Karl Schwarzschild Meeting on Gravitational Physics, focused on the general theme of black holes, gravity and information.Specialists in the field of black hole physics and rising young researchers present the latest findings on the broad topic of black holes, gravity, and information, highlighting its applications to astrophysics, cosmology, particle physics, and strongly correlated systems.
Book Synopsis Quantum Gravity Removes Classical Singularities and Shortens the Life of Black Holes by : V. P. Frolov
Download or read book Quantum Gravity Removes Classical Singularities and Shortens the Life of Black Holes written by V. P. Frolov and published by . This book was released on 1979 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Classical and Quantum Singularities in a Cylindrically Symmetric Spacetime by : Brian Ross
Download or read book Classical and Quantum Singularities in a Cylindrically Symmetric Spacetime written by Brian Ross and published by . This book was released on 2005* with total page 14 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Quantum Gravity written by Claus Birkholz and published by BookRix. This book was released on 2018-01-09 with total page 125 pages. Available in PDF, EPUB and Kindle. Book excerpt: The reproducibility of facts is the hallmark of a natural science, the impossibility of counting up to infinity that of a measuring process, and the "law of great numbers" that of statistics. A statement like "Nothing will come from nothing, and nothing gets lost" will yield conservation laws. Bell's own interpretation of his no-go theorems, then, will directly give Quantum Gravity, and its iteration the unification of all types of forces of nature ("New Physics"). The present paper will outline the reasoning of Quantum Gravity and of New Physics rather than their technical details - as far as all that allows for separating those issues from each other. Thermodynamic principles are imposing 2 alternative channels to us: A closed system will yield the reaction channel conserving probabilty, and an open system the dynamic channel. Causality will mark the open channel, entanglement the reaction channel. Parities are the key to understanding a black hole free of singularities. Space, time, and mass can be counted from the non-valence parts of a particle as occurrence rates of special double-quant properties; Higgs is dispensable. The spectrum of stable particles derives from the representation of our static multiverse. Its building universes give us the illusion of motion (like by a flip book). Lagrange's formalism and its canonical quantization prove as classical dead locks of obsolete centuries. The multitude of positive results - like the fine-structure constant calculated correctly, e.g. - speak in favour of New Physics, the total absence of "broken" quantum numbers in favour of a deeper "understanding" of nature.
Book Synopsis Classical and Quantum Black Holes by : P Fre
Download or read book Classical and Quantum Black Holes written by P Fre and published by CRC Press. This book was released on 1999-09-01 with total page 370 pages. Available in PDF, EPUB and Kindle. Book excerpt: Black holes are becoming increasingly important in contemporary research in astrophysics, cosmology, theoretical physics, and mathematics. Indeed, they provoke some of the most fascinating questions in fundamental physics, which may lead to revolutions in scientific thought. Written by distinguished scientists, Classical and Quantum Black Holes provides a comprehensive panorama of black hole physics and mathematics from a modern point of view. The book begins with a general introduction, followed by five parts that cover several modern aspects of the subject, ranging from the observational and the experimental to the more theoretical and mathematical issues. The material is written at a level suitable for postgraduate students entering the field.
Book Synopsis Black Holes and Relativistic Stars by : Robert M. Wald
Download or read book Black Holes and Relativistic Stars written by Robert M. Wald and published by University of Chicago Press. This book was released on 1998 with total page 300 pages. Available in PDF, EPUB and Kindle. Book excerpt: A comprehensive summary of progress made during the past decade on the theory of black holes and relativistic stars, this collection includes discussion of structure and oscillations of relativistic stars, the use of gravitational radiation detectors, observational evidence for black holes, cosmic censorship, numerical work related to black hole collisions, the internal structure of black holes, black hole thermodynamics, information loss and other issues related to the quantum properties of black holes, and recent developments in the theory of black holes in the context of string theory. Volume contributors: Valeria Ferrari, John L. Friedman, James B. Hartle, Stephen W. Hawking, Gary T. Horowitz, Werner Israel, Roger Penrose, Martin J. Rees, Rafael D. Sorkin, Saul A. Teukolsky, Kip S. Thorne, and Robert M. Wald.
Book Synopsis Physics of Black Holes by : I. Novikov
Download or read book Physics of Black Holes written by I. Novikov and published by Springer Science & Business Media. This book was released on 2013-03-09 with total page 351 pages. Available in PDF, EPUB and Kindle. Book excerpt: One of the most exciting predictions of Einstein's theory of gravitationisthat there may exist 'black holes': putative objects whose gravitational fields are so strong that no physical bodies and signals can break free of their pull and escape. Even though a completely reliable discovery of a black hole has not yet been made, several objects among those scrutinized by astrophysicists will very likely be conformed as black holes. The proof that they do exist, and an analysis of their properties, would have a significance going far beyond astrophysics. Indeed, what is involved is not just the discovery of yet another, even if extremely remarkable, astrophysical object, but a test of the correctness of our understanding the properties of space and time in extremely strong gravitational fields. Theoretical research into the properties of black holes and into the possible corollaries of the hypothesis that they exist, has been carried out with special vigor since the beginning of the 1970s. In addition to those specific features of black holes that are important for the interpretation of their possible astrophysical manifestations, the theory has revealed a nurober of unexpected characteristics of physical interactions involving black holes. By now, a fairly detailed understanding has been achieved of the properties of the black holes, their possible astrophysical manifestations, and the specifics of the various physical processes involved. Furthermore, profound links were found between black-hole theory and such seemingly very distant fields as thermodynamics, information theory, and quantum theory.
Book Synopsis Evolution of Black Holes in Anti-de Sitter Spacetime and the Firewall Controversy by : Yen Chin Ong
Download or read book Evolution of Black Holes in Anti-de Sitter Spacetime and the Firewall Controversy written by Yen Chin Ong and published by Springer. This book was released on 2015-11-27 with total page 238 pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis focuses on the recent firewall controversy surrounding evaporating black holes, and shows that in the best understood example concerning electrically charged black holes with a flat event horizon in anti-de Sitter (AdS) spacetime, the firewall does not arise. The firewall, which surrounds a sufficiently old black hole, threatens to develop into a huge crisis since it could occur even when spacetime curvature is small, which contradicts general relativity. However, the end state for asymptotically flat black holes is ill-understood since their curvature becomes unbounded. This issue is avoided by working with flat charged black holes in AdS. The presence of electrical charge is crucial since black holes inevitably pick up charges throughout their long lifetime. These black holes always evolve toward extremal limit, and are then destroyed by quantum gravitational effects. This happens sooner than the time required to decode Hawking radiation so that the firewall never sets in, as conjectured by Harlow and Hayden. Motivated by the information loss paradox, the author also investigates the possibility that “monster” configurations might exist, with an arbitrarily large interior bounded by a finite surface area. Investigating such an object in AdS shows that in the best understood case, such an object -- much like a firewall -- cannot exist.
Book Synopsis Classical and Quantum Singularities of a Schwarzschild Black Hole Pierced by a Cosmic String by : Dónal P. Hanlon
Download or read book Classical and Quantum Singularities of a Schwarzschild Black Hole Pierced by a Cosmic String written by Dónal P. Hanlon and published by . This book was released on 2016 with total page 46 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Theoretical and Phenomenological Aspects of Non-singular Black Holes by : Frédéric Lamy
Download or read book Theoretical and Phenomenological Aspects of Non-singular Black Holes written by Frédéric Lamy and published by . This book was released on 2018 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The issue of singularities in General Relativity dates back to the very first solution to the equations of the theory, namely Schwarzschild's 1915 black hole. Whether they be of coordinate or curvature nature, these singularities have long puzzled physicists, who managed to better characterize them in the late 60's. This led to the famous singularity theorems applying both to cosmology and black holes, and which assume a classical behaviour of the matter content of spacetime summarized in the so-called energy conditions. The violation of these conditions by quantum phenomena supports the idea that singularities are to be seen as a limitation of General Relativity, and would be cured in a more general theory of quantum gravity. In this thesis, pending for such a theory, we aim at investigating black hole spacetimes deprived of any singularity as well as their observational consequences. To that purpose, we consider both modifications of General Relativity and the coupling of Einstein's theory to exotic matter contents. In the first case, we show that one can recover the static spherically symmetric non-singular black holes of Bardeen and Hayward in principle in mimetic gravity, and implicitly by a deformation of General Relativity's hamiltonian constraint in an approach based on loop quantum gravity techniques. In the second case, we stay inside the framework of General Relativity and consider effective energy-momentum tensors associated with a fully regular rotating Hayward metric and with a dynamical spacetime describing the formation and evaporation of a non-singular black hole. For the latter, we show that all models based on the collapse of ingoing null shells and willing to describe Hawking's evaporation are doomed to violate the energy conditions in a non-compact region of spacetime. Lastly, the theoretical study of the rotating Hayward metric comes with numerical simulations of such an object at the center of the Milky Way, using the ray-tracing code Gyoto and mimicking the known properties of the accretion structure of Sgr A*. These simulations allow exhibiting the two very different regimes of the metric, with or without horizon, and emphasize the difficulty of asserting the presence of a horizon from strong-field images as the ones provided by the Event Horizon Telescope.
Book Synopsis Quantum Gravity in 2+1 Dimensions by : Steven Carlip
Download or read book Quantum Gravity in 2+1 Dimensions written by Steven Carlip and published by Cambridge University Press. This book was released on 2003-12-04 with total page 296 pages. Available in PDF, EPUB and Kindle. Book excerpt: The first comprehensive survey of (2+1)-dimensional quantum gravity - for graduate students and researchers.
Book Synopsis Gravitation in Astrophysics by : B. Carter
Download or read book Gravitation in Astrophysics written by B. Carter and published by Springer. This book was released on 2011-10-19 with total page 399 pages. Available in PDF, EPUB and Kindle. Book excerpt: With the discovery of pulsars, quasars, and galactic X-ray sources in the late 60's and early 70's, and the coincident expansion in the search for gravitational waves, rela tivistic gravity assumed an important place in the astrophysics of localized objects. Only by pushing Einstein's solar-system-tested general theory of relativity to the study of the extremes of gravitational collapse and its outcomes did it seem that one could explain these frontier astronomical phenomena. This conclusion continues to be true today. Relativistic gravity had always played the central role in cosmology. The discov ery of the cosmic background radiation in 1965, the increasing understanding of matter physics at high energies in the decades following, and the growing wealth of observations on the large scale structure meant that it was possible to make increasingly detailed mod els of the universe, both today and far in the past. This development, not accidentally, was contemporary to that for localized objects described above.
