New Frontiers In Gravitational Collapse And Spacetime Singularities
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New Frontiers in Gravitational Collapse and Spacetime Singularities by Daniele Malafarina,Pankaj S. Joshi Pdf
The book collects a series of articles to review the advances that have been made in the field of gravitational collapse in general relativity and alternative theories of gravity in the past few years. Many approaches to black hole and singularity formation in general relativity and beyond have been proposed over the last few decades. The importance of collapse models is that they provide natural thought experiments where to test the behavior and properties of a variety of approaches to general relativity and its implications for ultra-compact objects in the universe.
Gravitational Collapse and Spacetime Singularities by Pankaj S. Joshi Pdf
Physical phenomena in astrophysics and cosmology involve gravitational collapse in a fundamental way. The final fate of a massive star when it collapses under its own gravity at the end of its life cycle is one of the most important questions in gravitation theory and relativistic astrophysics, and is the foundation of black hole physics. General relativity predicts that continual gravitational collapse gives rise to a space-time singularity. Quantum gravity may take over in such regimes to resolve the classical space-time singularity. This book, first published in 2007, investigates these issues, and shows how the visible ultra-dense regions arise naturally and generically as an outcome of dynamical gravitational collapse. It will be of interest to graduate students and academic researchers in gravitation physics, fundamental physics, astrophysics, and cosmology. It includes a detailed review of research into gravitational collapse, and several examples of collapse models are investigated in detail.
Gravitational Collapse and Spacetime Singularities by Pankaj S. Joshi Pdf
Physical phenomena in astrophysics and cosmology involve gravitational collapse in a fundamental way. The final fate of a massive star when it collapses under its own gravity at the end of its life cycle is one of the most important questions in gravitation theory and relativistic astrophysics, and is the foundation of black hole physics. General relativity predicts that continual gravitational collapse gives rise to a space-time singularity. Quantum gravity may take over in such regimes to resolve the classical space-time singularity. This book investigates these issues, and shows how the visible ultra-dense regions arise naturally and generically as an outcome of dynamical gravitational collapse. It will be of interest to graduate students and academic researchers in gravitation physics, fundamental physics, astrophysics, and cosmology. It includes a detailed review of research into gravitational collapse, and several examples of collapse models are investigated in detail.
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.
Global Aspects in Gravitation and Cosmology by Pankaj S. Joshi Pdf
Global aspects in gravitation theory and cosmology are reviewed here to emphasize the basic theme that the very nature of gravitational force is such that global considerations of space-time are vital to understand this force in detail. Amongst the topics included are the structure and topology of space-time, exact solutions and singularities, quantum effects in strong gravity fields, and global upper limits in cosmology. Major open problems of significance are pointed out and the treatment here on the final fate of gravitational collapse shows that very strong-curvature naked singularities could result from the continual collapse of matter. This places important constraints on the formulation of the cosmic censorship hypothesis which is a crucial open question in relativistic astrophysics and the black hole physics. - ;This book reviews in a unified manner global aspects in gravitation theory and cosmology, emphasizing the basic heme that the very nature of the gravitational field is such that global features of space-time inevitably come into play whenever we try to understand and interpret this force in detail. The topics considered here include results on the structure and topology of space-time; exact solutions to Einstein equations and singularities ; gravitational collapse in general relativity, a brief review of the status of quantum gravity; and consideration of quantum effects near space-time singularities in strong curvature fields. Also covered are the global upper limits in cosmology on elementary particle masses which might constitute the dark matter of the universe. After discussing in detail the fundamental role played by global considerations in gravity and general relativity, it is pointed out that significant problems remain: the nature and structure of space-time singularities; the cosmic censorship problem in black hole physics; and the issue of quantum effects in strong gravity fields, an understanding of which appears essential to formulate any quantum theory of gravity. The treatment here of the final fate of gravitational collapse of massive stars shows by means of explicit consideration of several exact scenarios, that powerfully-strong curvature naked singularities could result from the continual gravitational collapse of matter with several reasonable equations of state, including inflowing radiation, dust, or a perfect fluid. This places important constraints on possible formulations of the cosmic censorship hypothesis and the final fate of gravitational collapse, which is a crucial open question in the general theory of relativity and relativistic astrophysics and which is basic to the entire theory and applications of black hole physics. -
The Story of Collapsing Stars by Pankaj S. Joshi Pdf
This book journeys into one of the most fascinating intellectual adventures of recent decades - understanding and exploring the final fate of massive collapsing stars in the universe. The issue is of great interest in fundamental physics and cosmology today, from both the perspective of gravitation theory and of modern astrophysical observations. This is a revolution in the making and may be intimately connected to our search for a unified understanding of the basic forces of nature, namely gravity that governs the cosmological universe, and the microscopic forces that include quantum phenomena. According to the general theory of relativity, a massive star that collapses catastrophically under its own gravity when it runs out of its internal nuclear fuel must give rise to a space-time singularity. Such singularities are regions in the universe where all physical quantities take their extreme values and become arbitrarily large. The singularities may be covered within a black hole, or visible to faraway observers in the universe. Thus, the final fate of a collapsing massive star is either a black hole or a visible naked singularity. We discuss here recent results and developments on the gravitational collapse of massive stars and possible observational implications when naked singularities happen in the universe. Large collapsing massive stars and the resulting space-time singularities may even provide a laboratory in the cosmos where one could test the unification possibilities of basic forces of nature.
Modified and Quantum Gravity by Christian Pfeifer,Claus Lämmerzahl Pdf
This book discusses theoretical predictions and their comparison with experiments of extended and modified classical and quantum theories of gravity. The goal is to provide a readable access and broad overview over different approaches to the topic to graduate and PhD students as well as to young researchers. The book presents both, theoretical and experimental insights and is structured in three parts. The first addresses the theoretical models beyond special and general relativity such as string theory, Poincare gauge theory and teleparallelism as well as Finsler gravity. In turn, the second part is focused on the observational effects that these models generate, accounting for tests and comparisons which can be made on all possible scales: from the universe as a whole via binary systems, stars, black holes, satellite experiments, down to laboratory experiments at micrometer and smaller scales. The last part of this book is dedicated to quantum systems and gravity, showing tests of classical gravity with quantum systems, and coupling of quantum matter and gravity.
Gravitation by Charles W. Misner,Kip S. Thorne,John Archibald Wheeler Pdf
Spacetime physics -- Physics in flat spacetime -- The mathematics of curved spacetime -- Einstein's geometric theory of gravity -- Relativistic stars -- The universe -- Gravitational collapse and black holes -- Gravitational waves -- Experimental tests of general relativity -- Frontiers
Encyclopedia Of Cosmology, The - Set 2: Frontiers In Cosmology (In 3 Volumes) by Claudia De Rham,Andrew J Tolley Pdf
The second set of The Encyclopedia of Cosmology, in three volumes, continues this major, long-lasting, seminal reference at the graduate student level laid out by the most prominent researchers in the general field of cosmology. Together, these volumes will be a comprehensive review of the most important current topics in cosmology, discussing the important concepts and current status in each field, covering both theory and observation.These three volumes are edited by Dr Giovanni Fazio from the Center for Astrophysics | Harvard & Smithsonian, with each volume authored or edited by specialists in the area: Modified Gravity by Claudia de Rham and Andrew Tolley (Imperial College), Neutrino Physics and Astrophysics edited by Floyd Stecker (NASA/Goddard Space Flight Center), Black Holes edited by Zoltan Haiman (Columbia University). These volumes follow the earlier publication in 2020 of The Encyclopedia of Cosmology, which comprises the following four volumes: Galaxy Formation and Evolution by Rennan Barkana (Tel Aviv University), Numerical Simulations in Cosmology edited by Kentaro Nagamine (Osaka University / University of Nevada), Dark Energy by Shinji Tsujikawa (Tokyo University of Science), and Dark Matter by Jihn E Kim (Seoul National University). The Encyclopedia aims to provide an overview of the most important topics in cosmology and serve as an up-to-date reference in astrophysics.
Internal Structure of Black Holes and Spacetime Singularities by Lior M. Burko,Amos Ori Pdf
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.
Your Miracle After Miracle Life Celebrate Your Essence, Celebrate Your Eternity by Orest Bedrij Pdf
Your Miracle after Miracle Life: Celebrate Your Essence, Celebrate Your Eternity may very well be the most important scientific breakthrough to the best solutions and the best thinking to challenges posed by the greatest minds of all time. Science cannot solve the ultimate mystery of nature. And it is because in the last analysis we ourselves are part of the mystery we are trying to solve. —Max Planck, Nobel laureate, Berlin University The full meaning of life, the collective meaning of all human desires is fundamentally a mystery beyond our grasp . . . We have no right to expect that our intellect can formulate perfect concepts for the full understanding of inanimate nature’s phenomena. —Eugene Wigner, Nobel laureate, Princeton University It is difficult to imagine that we could be ever in the possession of final physical principles that have no explanation in terms of deeper principles. —Steven Weinberg, Nobel laureate, University of Texas M. Planck, E. Wigner, and S. Weinberg don’t help how humanity can solve the ultimate mystery of nature, the full meaning of life, nor how can we ever be in the possession of the final physical principles? Your Miracle after Miracle Life reveals the final demands of life and the best solutions belong to the Eternal Architect and Creator of the Universe. Now you can gain access to and mine the Eternal for the best and ultimate solutions to prosper and advance your divinity. Further than modern science, ahead of forbidden knowledge, here is your breakthrough to the Absolute Light and God. Experience miracle after miracle in your Christ Nature life.