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Author : Melinda M. Andrews
Publisher :
ISBN 13 :
Total Pages : 185 pages
Book Rating : 4.:/5 (888 download)
Download or read book Theoretical and Observational Viability of Modified Gravity written by Melinda M. Andrews and published by . This book was released on 2014 with total page 185 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Emmanuel N. Saridakis
Publisher : Springer Nature
ISBN 13 : 3030837157
Total Pages : 631 pages
Book Rating : 4.0/5 (38 download)
Download or read book Modified Gravity and Cosmology written by Emmanuel N. Saridakis and published by Springer Nature. This book was released on 2021-12-10 with total page 631 pages. Available in PDF, EPUB and Kindle. Book excerpt: With a focus on modified gravity this book presents a review of the recent developments in the fields of gravity and cosmology, presenting the state of the art, high-lighting the open problems, and outlining the directions of future research. General Relativity and the ΛCDM framework are currently the standard lore and constitute the concordance paradigm of cosmology. Nevertheless, long-standing open theoretical issues, as well as possible new observational ones arising from the explosive development of cosmology in the last two decades, offer the motivation and lead a large amount of research to be devoted in constructing various extensions and modifications. In this review all extended theories and scenarios are first examined under the light of theoretical consistency, and are then applied in various geometrical backgrounds, such as the cosmological and the spherical symmetric ones. Their predictions at both the background and perturbation levels, and concerning cosmology at early, intermediate and late times, are then confronted with the huge amount of observational data that astrophysics and cosmology has been able to offer in the last two decades. Theories, scenarios and models that successfully and efficiently pass the above steps are classified as viable and are candidates for the description of Nature, allowing readers to get a clear overview of the state of the art and where the field of modified gravity is likely to go. This work was performed in the framework of the COST European Action “Cosmology and Astrophysics Network for Theoretical Advances and Training Actions” - CANTATA.
Author : Baojiu Li
Publisher : World Scientific
ISBN 13 : 9813274018
Total Pages : 324 pages
Book Rating : 4.8/5 (132 download)
Download or read book Modified Gravity: Progresses And Outlook Of Theories, Numerical Techniques And Observational Tests written by Baojiu Li and published by World Scientific. This book was released on 2019-10-10 with total page 324 pages. Available in PDF, EPUB and Kindle. Book excerpt: Modified gravity theories have been a main focus of theoretical cosmology research in the past decade or so, and have been quickly developing into a mature research field that attracts attention, interest and effort from both theoretical and observational cosmologists. To be prepared for fully exploiting the future observational data, and to provide a guidance for people who are new to this field, it is useful to have a comprehensive review to summarise the current state of knowledge and to foresee the future developments.This book presents expert reviews on different topics in the field, which are then coordinated and organised in a self-consistent and self-contained manner. It is suitable for graduate students and researchers interested in the frontier research of gravity theories.
Author : Lavinia Heisenberg
Publisher : Springer
ISBN 13 : 3319189352
Total Pages : 212 pages
Book Rating : 4.3/5 (191 download)
Download or read book Theoretical and Observational Consistency of Massive Gravity written by Lavinia Heisenberg and published by Springer. This book was released on 2015-06-12 with total page 212 pages. Available in PDF, EPUB and Kindle. Book excerpt: This work is a detailed study of both the theoretical and phenomenological consequences of a massive graviton, within the ghost-free theory of massive gravity, the de Rham-Gabadadze-Tolley (dRGT) theory. Its aim is to test the physical viability of the theory. It begins by putting constraints on the parameters of the theory in the decoupling limit based on purely theoretical grounds, like classical stability in the cosmological evolution of self-accelerating and degravitating solutions. The author then constructs a proxy theory to massive gravity from the decoupling limit resulting in non-minimally coupled scalar-tensor interactions as an example of a subclass of Horndeski theories. Lastly, she addresses the natural question of whether the parameters introduced in the dRGT theory are subject to strong renormalization by quantum loops and shows how the non-renormalization theorem protects the graviton mass from quantum corrections. Beyond the decoupling limit the quantum corrections are found to be proportional to the graviton mass, proving its technical naturalness.
Author : Alexandra Eileen Terrana
Publisher :
ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (136 download)
Download or read book Modified Gravity and Cosmology on the Largest Scales written by Alexandra Eileen Terrana and published by . This book was released on 2017 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: This dissertation presents a series of my contributions to research in theoretical cosmology, focusing on aspects of the very large scale universe, particularly dark energy, cosmic acceleration, modified gravity, and cosmic variance. Following an overview of the current understanding of the standard cosmological model in chapter 1, three pertinent topics are discussed in detail. A common theme among all chapters is the desire to explain the properties of the universe on the largest scales. One of the biggest mysteries on large scales is the need for dark energy to explain the observed accelerated expansion of the late universe. The unsatisfying explanation offered by the standard cosmological model and the associated enormous fine tuning problem have driven considerable interest in infrared (long-distance) modifications of general relativity. In this work, we consider a particularly well motivated modified theory, massive gravity, in which the modification is to simply assume that the particle mediating the gravitational force has a non-zero mass. For a mass on the order of the Hubble constant, this theory offers an alternative explanation of the accelerated cosmic expansion. Chapter 2 lays the theoretical groundwork for massive gravity, summarizing its history and formalism. A fundamental challenge for any modified gravity theory is sequestering the modification to large enough distance scales, so that the predictions match general relativity on solar system scales where it has been tested to high precision. Chapter 3 provides a detailed analysis of massive gravity's ability to screen its extra degrees of freedom, allowing for continuity with general relativity on short distance scales. Further, in chapter 4, we explore the cosmological production and propagation of gravitational waves in an extension of massive gravity, bigravity, determining whether there may be any testable deviations from general relativity. Understanding these predictions is crucial, as there is now a vigorous observational program to probe possible deviations from our standard model. As rapid progress in observational cosmology unfolds, not only is it paramount to construct viable modified gravity theories to test against general relativity, it is necessary to explore which observational methods will be the most powerful for constraining them. This dissertation contains progress on both of these fronts: analyzing potential modified gravity theories, and analyzing potential novel observational probes of the large scale universe. Chapter 5 provides the theoretical framework for one such novel probe, the large scale kinetic Sunyaev-Zeldovich effect. This effect is particularly intriguing because of its ability to overcome cosmic variance, and thus help us unlock the secrets of the universe on the largest scales.
Author : Eleftherios Papantonopoulos
Publisher : Springer
ISBN 13 : 9783319100715
Total Pages : 426 pages
Book Rating : 4.1/5 (7 download)
Download or read book Modifications of Einstein's Theory of Gravity at Large Distances written by Eleftherios Papantonopoulos and published by Springer. This book was released on 2014-11-08 with total page 426 pages. Available in PDF, EPUB and Kindle. Book excerpt: In the last few years modified gravity theories have been proposed as extensions of Einstein's theory of gravity. Their main motivation is to explain the latest cosmological and astrophysical data on dark energy and dark matter. The study of general relativity at small scales has already produced important results (cf e.g. LNP 863 Quantum Gravity and Quantum Cosmology) while its study at large scales is challenging because recent and upcoming observational results will provide important information on the validity of these modified theories. In this volume, various aspects of modified gravity at large scales will be discussed: high-curvature gravity theories; general scalar-tensor theories; Galileon theories and their cosmological applications; F(R) gravity theories; massive, new massive and topologically massive gravity; Chern-Simons modifications of general relativity (including holographic variants) and higher-spin gravity theories, to name but a few of the most important recent developments. Edited and authored by leading researchers in the field and cast into the form of a multi-author textbook at postgraduate level, this volume will be of benefit to all postgraduate students and newcomers from neighboring disciplines wishing to find a comprehensive guide for their future research.
Author : Jonathan Pearson
Publisher : Springer Science & Business Media
ISBN 13 : 331901210X
Total Pages : 213 pages
Book Rating : 4.3/5 (19 download)
Download or read book Generalized Perturbations in Modified Gravity and Dark Energy written by Jonathan Pearson and published by Springer Science & Business Media. This book was released on 2013-09-20 with total page 213 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Author : Kotub Uddin
Publisher :
ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (118 download)
Download or read book The Viability of Modified Gravity Theories written by Kotub Uddin and published by . This book was released on 2009 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Albert Petrov
Publisher : Springer Nature
ISBN 13 : 3031466349
Total Pages : 106 pages
Book Rating : 4.0/5 (314 download)
Download or read book Introduction to Modified Gravity written by Albert Petrov and published by Springer Nature. This book was released on 2023-11-16 with total page 106 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book reviews various modified gravity models, including those with modifications in the pure gravitational sector; those involving extra fields, that is, scalar-tensor and vector-tensor gravity theories; gravity models with Lorentz symmetry breaking; and nonlocal gravity models. The authors discuss both classical and quantum aspects of these theories. The book is unique in bringing together all the current alternatives to Einstein gravity in one source and serves as an excellent starting point for graduate students and other newcomers seeking an overview. This second edition has been expanded with new results from a variety of approaches including f(R,Q,P) gravity, galileon gravity and massive gravity. Extended discussions of Lorentz-breaking terms and of non-local field theory have been added and a completely new chapter is devoted to models based on non-Riemannian geometry.
Author : Luca Amendola
Publisher : Cambridge University Press
ISBN 13 : 0521516005
Total Pages : 507 pages
Book Rating : 4.5/5 (215 download)
Download or read book Dark Energy written by Luca Amendola and published by Cambridge University Press. This book was released on 2010-06-10 with total page 507 pages. Available in PDF, EPUB and Kindle. Book excerpt: Introducing the theoretical ideas, observational methods and results in dark energy, this textbook is a thorough introduction to dark energy for graduate courses.
Author : Georg Wolschin
Publisher : Springer
ISBN 13 : 364210598X
Total Pages : 188 pages
Book Rating : 4.6/5 (421 download)
Download or read book Lectures on Cosmology written by Georg Wolschin and published by Springer. This book was released on 2010-03-10 with total page 188 pages. Available in PDF, EPUB and Kindle. Book excerpt: The lectures that four authors present in this volume investigate core topics related to the accelerated expansion of the Universe. Accelerated expansion occured in the ?36 very early Universe – an exponential expansion in the in ationary period 10 s after the Big Bang. This well-established theoretical concept had rst been p- posed in 1980 by Alan Guth to account for the homogeneity and isotropy of the observable universe, and simultaneously by Alexei Starobinski, and has since then been developed by many authors in great theoretical detail. An accelerated expansion of the late Universe at redshifts z
Author : Adrián Casado Turrión
Publisher :
ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (142 download)
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...
Author : Ruben Aldrovandi
Publisher : Springer Science & Business Media
ISBN 13 : 9400751435
Total Pages : 216 pages
Book Rating : 4.4/5 (7 download)
Download or read book Teleparallel Gravity written by Ruben Aldrovandi and published by Springer Science & Business Media. This book was released on 2012-08-10 with total page 216 pages. Available in PDF, EPUB and Kindle. Book excerpt: Teleparallel Gravity (TG) is an alternative theory for gravitation, which is equivalent to General Relativity (GR). However, it is conceptually different. For example in GR geometry replaces the concept of force, and the trajectories are determined by geodesics. TG attributes gravitation to torsion, which accounts for gravitation by acting as a force. TG has already solved some old problems of gravitation (like the energy-momentum density of the gravitational field). The interest in TG has grown in the last few years. The book here proposed will be the first one dedicated exclusively to TG, and will include the foundations of the theory, as well as applications to specific problems to illustrate how the theory works.
Author : Clifford M. Will
Publisher : Cambridge University Press
ISBN 13 : 1107117445
Total Pages : 363 pages
Book Rating : 4.1/5 (71 download)
Download or read book Theory and Experiment in Gravitational Physics written by Clifford M. Will and published by Cambridge University Press. This book was released on 2018-09-27 with total page 363 pages. Available in PDF, EPUB and Kindle. Book excerpt: A comprehensive review of the testing and research conducted on Einstein's theory of general relativity.
Author : Cesar Augusto Zen Vasconcellos
Publisher : World Scientific
ISBN 13 : 9813277351
Total Pages : 299 pages
Book Rating : 4.8/5 (132 download)
Download or read book Topics On Strong Gravity: A Modern View On Theories And Experiments written by Cesar Augusto Zen Vasconcellos and published by World Scientific. This book was released on 2019-12-26 with total page 299 pages. Available in PDF, EPUB and Kindle. Book excerpt: 'The book concentrates attention on extended alternative theories of gravity and on the best astrophysical laboratories to probe the strong gravity-field regime: black holes, pulsars and neutron stars … Readers will likely share the satisfaction the editor and contributors say they experienced as they organized the book.'SirReadaLotFor more than a century, our understanding of gravitational physics was based on Albert Einstein's theory of General Relativity, which fundamentally changed our understanding of the Universe, its origin, and its evolutionary process. General Relativity accurately describes a large number of phenomena on very different scales. As such, it has been very well tested and its remarkable predictions are compatible with most experimental and observational data. However, the observational and experimental results compatible with General Relativity fall in its vast majority under the weak gravitational field regime. In recent years, discrepancies between the data and the corresponding predictions of General Relativity have been observed and have generated intense research activity. One of the most critical aspects of General Relativity is the presence of singularities in extreme physical situations. These discrepancies indicate that either the parameters of the theory must be modified in the regime of strong field gravity/high energy and large space-time curvature, or the theory itself should be modified. In this book, we focus our attention on extended alternative gravity theories and the best astrophysical laboratories to probe the strong field regime: black holes, pulsars, and neutron stars.
Author : Tiberiu Harko
Publisher : Cambridge University Press
ISBN 13 : 1108584578
Total Pages : 476 pages
Book Rating : 4.1/5 (85 download)
Download or read book Extensions of f(R) Gravity written by Tiberiu Harko and published by Cambridge University Press. This book was released on 2018-11-08 with total page 476 pages. Available in PDF, EPUB and Kindle. Book excerpt: Recent cosmological observations have posed a challenge for traditional theories of gravity: what is the force driving the accelerated expansion of the universe? What if dark energy or dark matter do not exist and what we observe is a modification of the gravitational interaction that dominates the universe at large scales? Various extensions to Einstein's General Theory of Relativity have been proposed, and this book presents a detailed theoretical and phenomenological analysis of several leading, modified theories of gravity. Theories with generalised curvature-matter couplings are first explored, followed by hybrid metric-Palatini gravity. This timely book first discusses key motivations behind the development of these modified gravitational theories, before presenting a detailed overview of their subsequent development, mathematical structure, and cosmological and astrophysical implications. Covering recent developments and with an emphasis on astrophysical and cosmological applications, this is the perfect text for graduate students and researchers.
Author : Iberê Kuntz
Publisher : Springer
ISBN 13 : 3030211975
Total Pages : 82 pages
Book Rating : 4.0/5 (32 download)
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.
