Gravity The Solution Of Dark Matter
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Exact Solutions And Scalar Fields In Gravity
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Author : Alfredo Macías
language : en
Publisher: Springer Science & Business Media
Release Date : 2007-05-08
Exact Solutions And Scalar Fields In Gravity written by Alfredo Macías and has been published by Springer Science & Business Media this book supported file pdf, txt, epub, kindle and other format this book has been release on 2007-05-08 with Science categories.
Divided into four parts, this book covers recent developments in topics pertaining to gravity theories, including discussions on the presence of scalar fields. Part One is devoted to exact solutions in general relativity, and is mainly concerned with the results of rotating null dust beams and fluids. Also included is a panoramic vision of new research directions in this area, which would require revising certain theorems and their possible extensions within gravity theories, new aspects concerning the Ernst potentials, double Kerr spacetimes, and rotating configurations. In particular, there is a detailed discussion of totally symmetric and totally geodesic spaces, in which a method for generating (2+1)-dimensional solutions from (3+1)-dimensional solutions is given. Part Two deals with alternative theories of gravity, all of which include scalar fields and gauge fields. Here, quantum and cosmological effects, which arise from both gravity theories in four and higher dimensions and from metric-affine theories, are investigated. Part Three is devoted to cosmological and inflationary scenarios. Local effects, such as the influence of scalar fields in protogalactic interactions, numerical studies of the collapse of molecular cores, as well as the inverse inflationary problem and the blue eigenvalue spectrum of it, are considered. Moreover, the role of scalar fields as dark matter and quantum cosmology in the Bergman-Wagoner and Gowdy theories, together with the relation of the conformal symmetry and deflationary gas universe, are likewise presented. The last part of the book includes some mixed topics which are still in the experimental stage. Among them are the foundation of the Maxwell theory, a discussion on electromagnetic Thirring problems, a note on the staticity of black holes with non-minimally coupled scalar fields, and a study of the Lorentz force free charged fluids in general relativity. Thus, this book is the most up-to-date, comprehensive collection of papers on the subject of exact solutions and scalar fields in gravity and is a valuable tool for researchers in the area.
Einstein S Telescope The Hunt For Dark Matter And Dark Energy In The Universe
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Author : Evalyn Gates
language : en
Publisher: W. W. Norton & Company
Release Date : 2010-02-22
Einstein S Telescope The Hunt For Dark Matter And Dark Energy In The Universe written by Evalyn Gates and has been published by W. W. Norton & Company this book supported file pdf, txt, epub, kindle and other format this book has been release on 2010-02-22 with Science categories.
"In Einstein’s Telescope, Evalyn Gates, an expert on all that’s dark in the universe, brings dark matter, dark energy, and even black holes to light." —Neil deGrasse Tyson, astrophysicist, American Museum of Natural History, and New York Times best-selling author of Astrophysics for People in a Hurry In 1936, Albert Einstein predicted that gravitational distortions would allow space itself to act as a telescope far more powerful than humans could ever build. Now, cosmologists at the forefront of their field are using this radical technique ("Einstein’s Telescope") to detect the invisible. In fresh, engaging prose, astrophysicist Evalyn Gates explains how this tool is enabling scientists to uncover planets as big as the Earth, discover black holes as they whirl through space, and trace the evolution of cosmic architecture over billions of years. Powerful and accessible, Einstein’s Telescope takes us to the brink of a revolution in our understanding of the deepest mysteries of the Universe.
Dark Matter
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Author : J. Val Blain
language : en
Publisher: Nova Publishers
Release Date : 2006
Dark Matter written by J. Val Blain and has been published by Nova Publishers this book supported file pdf, txt, epub, kindle and other format this book has been release on 2006 with Science categories.
It is generally believed that most of the matter in the universe is dark, i.e. cannot be detected from the light which it emits (or fails to emit). Its presence is inferred indirectly from the motions of astronomical objects, specifically stellar, galactic, and galaxy cluster/supercluster observations. It is also required in order to enable gravity to amplify the small fluctuations in the cosmic microwave background enough to form the large-scale structures that we see in the universe today. For each of the stellar, galactic, and galaxy cluster/supercluster observations the basic principle is that if we measure velocities in some region, then there has to be enough mass there for gravity to stop all the objects flying apart. Dark matter has important consequences for the evolution of the universe and the structure within it. According to general relativity, the universe must conform to one of three possible types: open, flat, or closed. The total amount of mass and energy in the universe determines which of the three possibilities applies to the universe. In the case of an open universe, the total mass and energy density (denoted by the Greek letter Ù) is less than unity. If the universe is closed, Ù is greater than unity. For the case where Ù is exactly equal to one the universe is "flat". This new book details leading-edge research from around the globe.
Dark Matter And Dark Energy
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Author : Brian Clegg
language : en
Publisher: Icon Books
Release Date : 2019-08-08
Dark Matter And Dark Energy written by Brian Clegg and has been published by Icon Books this book supported file pdf, txt, epub, kindle and other format this book has been release on 2019-08-08 with Science categories.
'Clear and compact ... It's hard to fault as a brief, easily digestible introduction to some of the biggest questions in the Universe' Giles Sparrow, BBC Four's The Sky at Night , Best astronomy and space books of 2019: 5/5 All the matter and light we can see in the universe makes up a trivial 5 per cent of everything. The rest is hidden. This could be the biggest puzzle that science has ever faced. Since the 1970s, astronomers have been aware that galaxies have far too little matter in them to account for the way they spin around: they should fly apart, but something concealed holds them together. That 'something' is dark matter - invisible material in five times the quantity of the familiar stuff of stars and planets. By the 1990s we also knew that the expansion of the universe was accelerating. Something, named dark energy, is pushing it to expand faster and faster. Across the universe, this requires enough energy that the equivalent mass would be nearly fourteen times greater than all the visible material in existence. Brian Clegg explains this major conundrum in modern science and looks at how scientists are beginning to find solutions to it.
Cosmological Dark Matter Proceedings Of The International School
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Author : Jose W F Valle
language : en
Publisher: World Scientific
Release Date : 1994-08-31
Cosmological Dark Matter Proceedings Of The International School written by Jose W F Valle and has been published by World Scientific this book supported file pdf, txt, epub, kindle and other format this book has been release on 1994-08-31 with categories.
This volume treats various facets of the dark matter problem. Its themes include astronomical data (galaxy rotation curves, dynamics of galaxy clusters, microlensing of stars in the Large Magellanic Cloud), particle physics (nonbaryonic dark matter, neutrinos) and computer simulation of the evolution of large-scale structure in the universe. Solar neutrinos and prospects for their detection through underground experiments are also discussed. The book will provide a useful reference for all those interested in astroparticle physics.
Generalized Perturbations In Modified Gravity And Dark Energy
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Author : Jonathan Pearson
language : en
Publisher: Springer Science & Business Media
Release Date : 2013-09-20
Generalized Perturbations In Modified Gravity And Dark Energy written by Jonathan Pearson and has been published by Springer Science & Business Media this book supported file pdf, txt, epub, kindle and other format this book has been release on 2013-09-20 with Science categories.
When predictions of Einstein's theory of General Relativity are compared against observations of our Universe, a huge inconsistency is found. The most popular fix for this inconsistency is to "invent" around 94% of the content of the universe: dark matter and dark energy. The dark energy is some exotic substance responsible for the apparent observed acceleration of the Universe. Another fix is to modify the theory of gravity: it is entirely plausible that Einstein's theory of General Relativity breaks down on cosmological scales, just as Newton's theory of gravity breaks down in the extreme gravitational field of the Sun. There are many alternative theories of gravity, each with the aim of describing observations of our Universe where General Relativity fails. Whether it is dark energy or some modified theory of gravity, it is clear that there is some "dark sector" in the Universe. In this thesis the author constructs a unifying framework for understanding the observational impact of general classes of dark sector theories, by formulating equations of state for the dark sector perturbations.
Recent Progress On Gravity Tests
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Author : Cosimo Bambi
language : en
Publisher: Springer Nature
Release Date : 2024-07-09
Recent Progress On Gravity Tests written by Cosimo Bambi and has been published by Springer Nature this book supported file pdf, txt, epub, kindle and other format this book has been release on 2024-07-09 with Science categories.
Einstein's theory of general relativity is one of the pillars of modern physics and it is our standard framework for describing gravitational fields and the spacetime structure. So far, general relativity has passed all experimental tests and agrees with observations. However, the past few years have seen remarkable observational improvements and new techniques that continually challenge the theory's predictions: routinely detect the gravitational wave signals from the coalescence of black holes and neutron stars; can image the supermassive black holes at the center of our Galaxy and of the galaxy M87; can analyze the properties of the X-ray radiation emitted from the very inner part of the accretion disks of several black holes; and keep improving laboratory and Solar System experiments. This book offers an updated self-consistent overview, future perspectives, and challenges of experimental and observational tests of gravity, with both gravitational and electromagnetic spectra. It includes the recent results of laboratory tests of gravity, solar system experiments, tests of gravity in the strong-field regime with astrophysical compact objects, and tests of gravity on large scales with cosmological observations.
Dark Matter In Astro And Particle Physics Dark 96
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Author : Hans Volker Klapdor-kleingrothaus
language : en
Publisher: World Scientific
Release Date : 1997-10-13
Dark Matter In Astro And Particle Physics Dark 96 written by Hans Volker Klapdor-kleingrothaus and has been published by World Scientific this book supported file pdf, txt, epub, kindle and other format this book has been release on 1997-10-13 with categories.
This volume contains the talks presented at the International Workshop on Aspects of Dark Matter in Astro- and Particle Physics (DARK '96). It provides a thorough presentation and discussion of the topic of dark matter, which currently seems to be one of the most exciting problems of modern physics, in the perspectives of different disciplines like astronomy, astrophysics, cosmology and particle physics.The lectures and talks range from astronomical evidence in galaxies and galaxy clusters, recent information provided by X rays (ROSAT satellite) and by observation of MACHOs, to early universe and particle physics solutions to the dark matter problem, including simultaneous solutions to the problems of baryogenesis and dark matter. Beyond the favoured supersymmetric candidates, the more exotic dark matter proposals are also discussed. The experimental section examines the most recent efforts in direct and indirect experiments, including new techniques like cryogenic detectors and superheated droplet detectors, as well as efforts with large scale underground detectors like MACRO, Baksan, Baikal and AMANDA. Also, the potential of present and future (LHC) high energy accelerators is thoroughly discussed. A section on hot dark matter gives the current status of experiments searching for a neutrino mass, like double beta decay and neutrino oscillation experiments, including intermediate scale long baseline experiments.
Philosophy Of Astrophysics
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Author : Nora Mills Boyd
language : en
Publisher: Springer Nature
Release Date : 2023-06-28
Philosophy Of Astrophysics written by Nora Mills Boyd and has been published by Springer Nature this book supported file pdf, txt, epub, kindle and other format this book has been release on 2023-06-28 with Science categories.
This is an open access book. This book, the first edited collection of its kind, explores the recent emergence of philosophical research in astrophysics. It assembles a variety of original essays from scholars who are currently shaping this field, and it combines insightful overviews of the current state of play with novel, significant contributions. It therefore provides an ideal source for understanding the current debates in philosophy of astrophysics, and it offers new ideas for future cutting-edge research. The selection of essays offered in this book addresses methodological and metaphysical questions that target a wide range of topics, including dark matter, black holes, astrophysical observations and modelling. The book serves as the first standard resource in philosophy of astrophysics for all scholars who work in the field and want to expand or deepen their knowledge, but it also provides an accessible guide for all those philosophers and scientists who are interested in getting a first, basic understanding of the main issues in philosophy of astrophysics.
Solutions Of Exercises Of General Relativity Simplified Assessed
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Author : Taha Sochi
language : en
Publisher: Taha Sochi
Release Date :
Solutions Of Exercises Of General Relativity Simplified Assessed written by Taha Sochi and has been published by Taha Sochi this book supported file pdf, txt, epub, kindle and other format this book has been release on with Science categories.
This book contains detailed solutions of all the 606 exercises of my book: General Relativity Simplified & Assessed. These exercises represent an integral part of the original book as they fill many gaps and provide essential extensions and elaborations.