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Gravitational Collapse Compact Objects And Gravitational Waves In General Relativity And Modified Gravity
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Book Synopsis Gravitational Collapse, Compact Objects and Gravitational Waves in General Relativity and Modified Gravity by : Roxana Rosca-Mead
Download or read book Gravitational Collapse, Compact Objects and Gravitational Waves in General Relativity and Modified Gravity written by Roxana Rosca-Mead and published by . This book was released on 2019 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis New Frontiers in Gravitational Collapse and Spacetime Singularities by : Daniele Malafarina
Download or read book New Frontiers in Gravitational Collapse and Spacetime Singularities written by Daniele Malafarina and published by Springer. This book was released on 2024-05-21 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Author :Cecile Dewitt-Morette (ed) Publisher :Springer Science & Business Media ISBN 13 :9789027704368 Total Pages :244 pages Book Rating :4.7/5 (43 download)
Book Synopsis Gravitational Radiation and Gravitational Collapse by : Cecile Dewitt-Morette (ed)
Download or read book Gravitational Radiation and Gravitational Collapse written by Cecile Dewitt-Morette (ed) and published by Springer Science & Business Media. This book was released on 1974-05-31 with total page 244 pages. Available in PDF, EPUB and Kindle. Book excerpt: Proceedings of IAU Symposium No. 64, Warsaw, Poland, September 5-8, 1973
Book Synopsis Gravitational Theories Beyond General Relativity by : Iberê Kuntz
Download or read book Gravitational Theories Beyond General Relativity written by Iberê Kuntz and published by Springer. This book was released on 2019-05-21 with total page 82 pages. Available in PDF, EPUB and Kindle. Book excerpt: Despite the success of general relativity in explaining classical gravitational phenomena, several problems at the interface between gravitation and high energy physics still remain open. The purpose of this thesis is to explore quantum gravity and its phenomenological consequences for dark matter, gravitational waves and inflation. A new formalism to classify gravitational theories based on their degrees of freedom is introduced and, in light of this classification, it is argued that dark matter is no different from modified gravity. Gravitational waves are shown to be damped due to quantum degrees of freedom. The consequences for gravitational wave events are also discussed. The non-minimal coupling of the Higgs boson to gravity is studied in connection with Starobinsky inflation and its implications for the vacuum instability problem is analyzed.
Book Synopsis Compact Objects in Exotic Premise and Underlying Gravitational Waves by : Surajit Kalita
Download or read book Compact Objects in Exotic Premise and Underlying Gravitational Waves written by Surajit Kalita and published by Eliva Press. This book was released on 2023 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Einstein's theory of general relativity and quantum mechanics were among the most startling discoveries in the 20th century. Based on these theories, the maximum mass of a non-rotating non-magnetized white dwarf was found to be about 1.4 solar mass, known as the Chandrasekhar mass-limit. However, over the past decades, various researchers have indirectly predicted many sub- and super-Chandrasekhar limiting mass white dwarfs (white dwarfs which violate the Chandrasekhar mass-limit) from the luminosity based observations of peculiar type Ia supernovae. Several research groups worldwide, earlier proposed different models, including magnetic fields, rotation, modified gravity, noncommutative geometry, and many more, to explain these peculiar white dwarfs. However, no such white dwarfs have so far been observed directly in any observations and hence to predict the correct theory for white dwarfs is still unclear. In this book, we show that if such white dwarfs rotate in such a way that their magnetic field and rotation axes are not aligned with each other, they can emit continuous gravitational radiation, which in the future, various detectors, such as LISA, TianQin, BBO, DECIGO, Einstein Telescope, etc., can detect with a significant signal-to-noise ratio. Thereby one can predict the structure of the white dwarfs and single out the correct theory of gravity. In the related context of modified gravity, we show that even in vacuum, asymptotically flat solution of the modified Einstein equation is possible. All these results argue that the premise of modified theory of gravity seems to be an excellent platform to explain unsolved astronomical problems.
Book Synopsis Physics of Gravitational Waves by : Arun Kenath
Download or read book Physics of Gravitational Waves written by Arun Kenath and published by Springer. This book was released on 2023-05-26 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book provides a concise introduction to the physics of gravitational waves. It is aimed at graduate-level students and PhD scholars. Ever since the discovery of gravitational waves in 2016, gravitational wave astronomy has been adding to our understanding of the universe. Gravitational waves have been detected in the past few years from several transient events such as merging stellar-mass black holes, binary neutron stars, etc. These waves have frequencies in a band ranging from a few hundred hertz to around a kilohertz to which LIGO type instruments are sensitive. LISA will be sensitive to much lower range of frequencies from SMBH mergers. Apart from these cataclysmic burst events, there are innumerable sources of radiation which are continuously emitting gravitational waves of all frequencies. These include a whole mass range of compact binary and isolated compact objects and close planetary stellar entities. This book discusses the gravitational wave background produced in typical frequency ranges from such sources emitting over a Hubble time and the fluctuations in the h values measured in the usual devices. Also discussed are the high-frequency thermal background gravitational radiation from hot stellar interiors and newly formed compact objects. The reader will also learn how gravitational waves provide a testing tool for various theories of gravity, i.e. general relativity and extended theories of gravity, and will be the definitive test for general relativity.
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 Compact Objects in the Universe by : Eleftherios Papantonopoulos
Download or read book Compact Objects in the Universe written by Eleftherios Papantonopoulos and published by Springer Nature. This book was released on 2024 with total page 395 pages. Available in PDF, EPUB and Kindle. Book excerpt: The main objective of this volume is to discuss the physical properties, observational signals and various probes of compact objects in the Universe. These include black holes, neutron stars, and exotic objects studied in alternative theories of gravity. The text is mainly addressed to postgraduate students and young researchers with the aim of introducing them to these very challenging topics.
Book Synopsis Compact Objects in Modified Gravity by : Adrián Casado Turrión
Download or read book Compact Objects in Modified Gravity written by Adrián Casado Turrión and published by . This book was released on 2023 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The purpose of this Thesis is to improve our understanding of the strong-field regime of gravitational interactions, where deviations from the theory of General Relativity (GR) are expected to be found on theoretical grounds. In particular, our investigations have been concerned with the formulation and application of junction conditions (which govern stellar collapse, black-hole formation and the dynamics of more exotic compact objects), as well as with other viability criteria necessary for modified gravity theories and their solutions to be physically admissible (such as stability or the avoidance of singularities). We will concentrate on two paradigmatic modifications of GR, namely, f (R) theories (specially on the metric formulation) and the ghost-free sub-class of Poincaré Gauge Gravity...
Book Synopsis Gravitational Collapse and Spacetime Singularities by : Pankaj S. Joshi
Download or read book Gravitational Collapse and Spacetime Singularities written by Pankaj S. Joshi and published by Cambridge University Press. This book was released on 2012-09-20 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Book Synopsis Gravitational Waves and Inspiraling Compact Binaries in Alternative Theories of Gravity by : Saeed Mirshekari
Download or read book Gravitational Waves and Inspiraling Compact Binaries in Alternative Theories of Gravity written by Saeed Mirshekari and published by . This book was released on 2013 with total page 218 pages. Available in PDF, EPUB and Kindle. Book excerpt: This dissertation consists of four parts. In Part I, we briefly review fundamental theories of gravity, performed experimental tests, and gravitational waves. The framework and the methods that we use in our calculations are discussed in Part II. This part includes reviewing the methods of the Parametrized Post-Newtonian (PPN) framework, Direct Integration of Relaxed Einstein Equations (DIRE), and Matched Filtering. In Part III, we calculate the explicit equations of motion for non-spinning compact objects (neutron stars or black holes) to 2.5 post-Newtonian order, or O(v/c)5 beyond Newtonian gravity, in a general class of alternative theories to general relativity known as scalar-tensor theories. For the conservative part of the motion, we obtain the two-body Lagrangian and conserved energy and momentum through second post-Newtonian order. We find the contributions to gravitational radiation reaction to 1.5 post-Newtonian and 2.5 post-Newtonian orders, the former corresponding to the effects of dipole gravitational radiation. For binary black holes we show that the motion through 2.5 post-Newtonian order is observationally identical to that predicted by general relativity. In Part IV, we construct a parametrized dispersion relation that can produce a range of predictions of alternative theories of gravity for violations of Lorentz invariance in gravitation, and investigate their impact on the propagation of gravitational waves. We show how such corrections map to the waveform observable by a gravitational-wave detector, and to the "parametrized post-Einsteinian framework", proposed to model a range of deviations from General Relativity. Given a gravitational-wave detection, the lack of evidence for such corrections could then be used to place a constraint on Lorentz violation.
Book Synopsis Modified and Quantum Gravity by : Christian Pfeifer
Download or read book Modified and Quantum Gravity written by Christian Pfeifer and published by Springer Nature. This book was released on 2023-11-01 with total page 557 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Book Synopsis The Nature of Spherical Collapse and a Study of Black Hole Dynamics by : Sourabh Nampalliwar
Download or read book The Nature of Spherical Collapse and a Study of Black Hole Dynamics written by Sourabh Nampalliwar and published by . This book was released on 2015 with total page 131 pages. Available in PDF, EPUB and Kindle. Book excerpt: Gravitational waves and singularities are two of the most significant predictions of General Relativity. Binary systems are the most promising sources of gravitational waves that are expected to be detected with the current ground-based and upcoming space-based gravitational wave detectors. During the merger of binary compact objects, an important stage is the plunge. A small part of the gravitational waveform, it marks the end of early inspiral and determines the quasinormal ringing (QNR) of the final product of the merger. It is also the part of the waveform where most of the gravitational energy is released. But, unlike early inspiral and late ringdown, it is poorly understood in terms of phenomenology. This thesis introduces a novel approach combining the Fourier domain Green's function in the particle perturbation approximation and a simple model to understand this crucial stage. The resulting understanding is successful in explaining QNR for a Schwarzschild black hole and opens a new approach to understanding binary inspiral. It holds the promise of a much improved understanding, and improved efficiency in making astrophysical estimates of gravitational wave source strength. Singularities are known to be the ultimate fate of all massive stars undergoing gravitational collapse. The cosmic censorship hypothesis predicts that all these singularities are generically covered by event horizons, i.e., all collapsing stars, if they result in a singularity, end up as black holes. Although several theoretical examples of non-hidden (naked) singularities have been found, the question of the genericity of naked singularities is far from settled. This thesis presents a study of the causal structure of spherically symmetric models of dust collapse and its perturbations to investigate the genericity of naked singularities.
Book Synopsis Gravitational Radiation, Collapsed Objects, and Exact Solutions by : Cyril Edwards
Download or read book Gravitational Radiation, Collapsed Objects, and Exact Solutions written by Cyril Edwards and published by Springer. This book was released on 1980 with total page 510 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Gravitational Waves and the Deformation of Compact Objects by : Nathan Kieran Johnson-McDaniel
Download or read book Gravitational Waves and the Deformation of Compact Objects written by Nathan Kieran Johnson-McDaniel and published by . This book was released on 2011 with total page 234 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Gravitational Waves from Gravitational Collapse by :
Download or read book Gravitational Waves from Gravitational Collapse written by and published by . This book was released on 2008 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Gravitational wave emission from stellar collapse has been studied for nearly four decades. Current state-of-the-art numerical investigations of collapse include those that use progenitors with more realistic angular momentum profiles, properly treat microphysics issues, account for general relativity, and examine non-axisymmetric effects in three dimensions. Such simulations predict that gravitational waves from various phenomena associated with gravitational collapse could be detectable with ground-based and space-based interferometric observatories. This review covers the entire range of stellar collapse sources of gravitational waves: from the accretion induced collapse of a white dwarf through the collapse down to neutron stars or black holes of massive stars to the collapse of supermassive stars.
Book Synopsis Exact Space-Time Models of Gravitational Waves by : Peter A. Hogan
Download or read book Exact Space-Time Models of Gravitational Waves written by Peter A. Hogan and published by Springer. This book was released on 2022-10-28 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The book is about exact space-time models of the gravitational fields produced by gravitational radiation. The authors’ extensive work in the field is reviewed in order to stimulate the study of such models, that have been known for a long time, and to highlight interesting physical aspects of the existing models in some novel detail. There is an underlying simplicity to the gravitational radiation studied in this book. Apart from the basic assumption that the radiation has clearly identifiable wave fronts, the gravitational waves studied are directly analogous to electromagnetic waves. The book is meant for advanced students and researchers who have a knowledge of general relativity sufficient to carry out research in the field.
