Cosmology in Scalar Tensor Gravity

Cosmology in Scalar Tensor Gravity

Considerable progress has been made in this exciting area of physics and this book is the first to provide a critical overview of the research.

Author: Valerio Faraoni

Publisher: Springer Science & Business Media

ISBN: 1402019882

Category: Science

Page: 274

View: 824

Cosmology in Scalar-Tensor Gravity covers all aspects of cosmology in scalar-tensor theories of gravity. Considerable progress has been made in this exciting area of physics and this book is the first to provide a critical overview of the research. Among the topics treated are: -Scalar-tensor gravity and its limit to general relativity, -Effective energy-momentum tensors and conformal frames, -Gravitational waves in scalar-tensor cosmology, -Specific scalar-tensor theories, -Exact cosmological solutions and cosmological perturbations, -Scalar-tensor scenarios of the early universe and inflation, -Scalar-tensor models of quintessence in the present universe and their far-reaching consequences for the ultimate fate of the cosmos.
Categories: Science

Quadratic Scalar tensor Gravity

Quadratic Scalar tensor Gravity

As this is important for the current dark energy problem, the quasi-static motion of the gravitational field induced by the scalar potential in the early universe, is investigated for a small value of the scalar field with normalized metric ...

Author: Trevor Bamidelé Davies

Publisher:

ISBN: OCLC:1063641292

Category:

Page:

View: 855

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Beyond Einstein Gravity

Beyond Einstein Gravity

The book provides a critical overview of the research in this area and unifies the existing literature using a consistent notation.

Author: Salvatore Capozziello

Publisher: Springer Science & Business Media

ISBN: 9400701659

Category: Science

Page: 428

View: 132

Beyond Einstein’s Gravity is a graduate level introduction to extended theories of gravity and cosmology, including variational principles, the weak-field limit, gravitational waves, mathematical tools, exact solutions, as well as cosmological and astrophysical applications. The book provides a critical overview of the research in this area and unifies the existing literature using a consistent notation. Although the results apply in principle to all alternative gravities, a special emphasis is on scalar-tensor and f(R) theories. They were studied by theoretical physicists from early on, and in the 1980s they appeared in attempts to renormalize General Relativity and in models of the early universe. Recently, these theories have seen a new lease of life, in both their metric and metric-affine versions, as models of the present acceleration of the universe without introducing the mysterious and exotic dark energy. The dark matter problem can also be addressed in extended gravity. These applications are contributing to a deeper understanding of the gravitational interaction from both the theoretical and the experimental point of view. An extensive bibliography guides the reader into more detailed literature on particular topics.
Categories: Science

Developments in Mathematical and Experimental Physics

Developments in Mathematical and Experimental Physics

The field to particle transition problem is also considered. The second part deals with cosmology and black holes. Here, cosmological, inflationary, and braneworld scenarios are investigated.

Author: Alfredo Macias

Publisher: Springer Science & Business Media

ISBN: 0306472937

Category: Science

Page: 300

View: 182

The first part is devoted to the topic of quantum gravity and string theories, mainly concerned with recent authoritative results in the study of discretizations in classical and quantum general relativity, non-commutative theories of gravity, (2+1)-dimensional supergravity, and Berezin description of Kaehler quotients. The field to particle transition problem is also considered. The second part deals with cosmology and black holes. Here, cosmological, inflationary, and braneworld scenarios are investigated. Moreover, some scalar field models for the dark matter content of the universe as well as new models of protostellar collapse and fragmentation are presented. This part includes also a study of de Sitter/Anti-de Sitter phase transition for black holes, an understanding of hairy black holes and an improvement of the no-hair theorem proof for the Proca field. The third part is devoted to exact solutions, in particular classical and quantum cosmological solutions in scalar-tensor theories. Additionally, a discussion about conformally flat axisymmetric spacetimes and some considerations on accelerated expansion in scalar-tensor theories are presented. Experimental and some mixed topics are included in the final part. Among them is an experimental foundation of nonlocality and superluminal signal velocity in photonic tunneling, a proposal for testing the weak equivalence principle for charged particles in space. Moreover, a possible new type of skewon field linked to Maxwell theory is also presented, and an authoritative discussion at the interface of quantum and gravitational realms.
Categories: Science

Modifications of Einstein s Theory of Gravity at Large Distances

Modifications of Einstein s Theory of Gravity at Large Distances

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, ...

Author: Eleftherios Papantonopoulos

Publisher: Springer

ISBN: 9783319100708

Category: Science

Page: 426

View: 620

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.
Categories: Science

Beyond Einstein Gravity

Beyond Einstein Gravity

The book provides a critical overview of the research in this area and unifies the existing literature using a consistent notation.

Author: Salvatore Capozziello

Publisher: Springer

ISBN: 9400701667

Category: Science

Page: 428

View: 890

Beyond Einstein’s Gravity is a graduate level introduction to extended theories of gravity and cosmology, including variational principles, the weak-field limit, gravitational waves, mathematical tools, exact solutions, as well as cosmological and astrophysical applications. The book provides a critical overview of the research in this area and unifies the existing literature using a consistent notation. Although the results apply in principle to all alternative gravities, a special emphasis is on scalar-tensor and f(R) theories. They were studied by theoretical physicists from early on, and in the 1980s they appeared in attempts to renormalize General Relativity and in models of the early universe. Recently, these theories have seen a new lease of life, in both their metric and metric-affine versions, as models of the present acceleration of the universe without introducing the mysterious and exotic dark energy. The dark matter problem can also be addressed in extended gravity. These applications are contributing to a deeper understanding of the gravitational interaction from both the theoretical and the experimental point of view. An extensive bibliography guides the reader into more detailed literature on particular topics.
Categories: Science

Black Holes Cosmology And Extra Dimensions Second Edition

Black Holes  Cosmology And Extra Dimensions  Second Edition

Assuming basic knowledge of special and general relativity, this book guides the reader to problems under consideration in modern research, concerning black holes, wormholes, cosmology, and extra dimensions.

Author: Kirill A Bronnikov

Publisher: World Scientific

ISBN: 9789811233463

Category: Science

Page: 592

View: 822

Assuming basic knowledge of special and general relativity, this book guides the reader to problems under consideration in modern research, concerning black holes, wormholes, cosmology, and extra dimensions. Its first part is devoted to local strong field configurations (black holes and wormholes) in general relativity and its most relevant extensions: scalar-tensor, f(R), and multidimensional theories. The second part discusses cosmology, including inflation and problems of a unified description of the whole evolution of the universe. The third part concerns multidimensional theories of gravity and contains a number of original results obtained by the authors. Expository work is conducted for a mechanism of symmetries and fundamental constants formation. The original approach to nonlinear multidimensional gravity that is able to construct a unique perspective describing different phenomena is highlighted.Much of the content was previously presented only in journal publications and is new for book contents, e.g., on regular black holes, various scalar field solutions, wormholes and their stability, inflation, clusters of primordial black holes, and multidimensional gravity. The last two topics are added in this new edition of the book. The other chapters are also updated to include new discoveries like the detection of gravitational waves.
Categories: Science

Inflation and Quantum Geometrodynamics in Scalar tensor Theories

Inflation and Quantum Geometrodynamics in Scalar tensor Theories

This is a canonical and non-perturbative formulation of quantum gravity, in which the Hamiltonian of the theory of general relativity is quantised in an analogous way as in non-relativistic quantum mechanics.

Author: Matthijs van der Wild

Publisher:

ISBN: OCLC:1137067480

Category:

Page:

View: 588

Abstract: The work described in this thesis is an investigation of scalar-tensor theories. Scalar-tensor theories generalise Einstein's theory of relativity by replacing the univeral coupling constant of gravity, the Planck mass, with a dynamical scalar field. One motivation to consider scalar-tensor theories can be found within cosmology itself. Observations indicate that, during the very early universe, space underwent a period of accelerated expansion. This phase of expansion is called inflation. The most common method to implement inflation introduces a new scalar field to generate the required vacuum energy. It is not yet clear what the fundamental nature of this scalar field should be, and general relativity does not provide an answer to this question. Scalar-tensor theories, on the other hand, naturally explain the existence of such a field. During inflation it can be expected that tiny quantum gravitational corrections can be found in the imprint of the cosmic microwave background radiation. These corrections can be studied within the formalism of quantum geometrodynamics, which is a canonical, non-perturbative theory of quantum gravity. An important object in this formalism is the Wheeler-DeWitt equation, which governs the dynamics of the quantised degrees of freedom. Although the Wheeler-DeWitt equation describes a full theory of quantum gravity, it has a well-defined classical limit, and quantum gravitational corrections can be systematically derived from a semiclassical expansion. The thesis starts with a review of the formalism of general relativity. It introduces a general class of scalar-tensor theories, and presents its properties. It reviews the formalism of inflation, and ends with the presentation of the formalism of inflation within the context of a general scalar-tensor theory. Furthermore, it presents the consequences of a general scalar-tensor theory in the context of semiclassical quantum gravity. The basis for this investigation is the canonical approach to quantum gravity, called quantum geometrodynamics. This is a canonical and non-perturbative formulation of quantum gravity, in which the Hamiltonian of the theory of general relativity is quantised in an analogous way as in non-relativistic quantum mechanics. The formalism is generalised to a general class of scalar-tensor theories. It is demonstrated how quantum geometrodynamics can be used to estimate the form and magnitude of the first quantum gravit ...
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The Scalar Tensor Theory of Gravitation

The Scalar Tensor Theory of Gravitation

This book provides a clear and concise introduction to the theoretical ideas and developments, exploring scalar fields and placing them in context with a discussion of Brans-Dicke theory.

Author: Yasunori Fujii

Publisher: Cambridge University Press

ISBN: 9781139436021

Category: Science

Page: 240

View: 739

The scalar-tensor theory of gravitation is one of the most popular alternatives to Einstein's theory of gravitation. This book provides a clear and concise introduction to the theoretical ideas and developments, exploring scalar fields and placing them in context with a discussion of Brans-Dicke theory. Topics covered include the cosmological constant problem, time variability of coupling constants, higher dimensional space-time, branes and conformal transformations. The authors emphasize the physical applications of the scalar-tensor theory and thus provide a pedagogical overview of the subject, keeping more mathematically detailed sections for the appendices. This book is suitable for graduate courses in cosmology, gravitation and relativity. It will also provide a valuable reference for researchers.
Categories: Science

At the Frontier of Spacetime

At the Frontier of Spacetime

Scalar-Tensor Theory, Bells Inequality, Machs Principle, Exotic Smoothness Torsten Asselmeyer-Maluga. 4. 5. 10. ... New York, 2003) V. Faraoni, Cosmology in Scalar-Tensor Gravity (Springer, New York, 2004) S. Capozziello, V. Faraoni, ...

Author: Torsten Asselmeyer-Maluga

Publisher: Springer

ISBN: 9783319312996

Category: Science

Page: 308

View: 492

In this book, leading theorists present new contributions and reviews addressing longstanding challenges and ongoing progress in spacetime physics. In the anniversary year of Einstein's General Theory of Relativity, developed 100 years ago, this collection reflects the subsequent and continuing fruitful development of spacetime theories. The volume is published in honour of Carl Brans on the occasion of his 80th birthday. Carl H. Brans, who also contributes personally, is a creative and independent researcher and one of the founders of the scalar-tensor theory, also known as Jordan-Brans-Dicke theory. In the present book, much space is devoted to scalar-tensor theories. Since the beginning of the 1990s, Brans has worked on new models of spacetime, collectively known as exotic smoothness, a field largely established by him. In this Festschrift, one finds an outstanding and unique collection of articles about exotic smoothness. Also featured are Bell's inequality and Mach's principle. Personal memories and historical aspects round off the collection.
Categories: Science

Cosmological and Black Hole Apparent Horizons

Cosmological and Black Hole Apparent Horizons

This book overviews the extensive literature on apparent cosmological and black hole horizons.

Author: Valerio Faraoni

Publisher: Springer

ISBN: 9783319192406

Category: Science

Page: 199

View: 980

This book overviews the extensive literature on apparent cosmological and black hole horizons. In theoretical gravity, dynamical situations such as gravitational collapse, black hole evaporation, and black holes interacting with non-trivial environments, as well as the attempts to model gravitational waves occurring in highly dynamical astrophysical processes, require that the concept of event horizon be generalized. Inequivalent notions of horizon abound in the technical literature and are discussed in this manuscript. The book begins with a quick review of basic material in the first one and a half chapters, establishing a unified notation. Chapter 2 reminds the reader of the basic tools used in the analysis of horizons and reviews the various definitions of horizons appearing in the literature. Cosmological horizons are the playground in which one should take baby steps in understanding horizon physics. Chapter 3 analyzes cosmological horizons, their proposed thermodynamics, and several coordinate systems. The remaining chapters discuss analytical solutions of the field equations of General Relativity, scalar-tensor, and f(R) gravity which exhibit time-varying apparent horizons and horizons which appear and/or disappear in pairs. An extensive bibliography enriches the volume. The intended audience is master and PhD level students and researchers in theoretical physics with knowledge of standard gravity.
Categories: Science

Recent Advances in Mathematical and Statistical Methods

Recent Advances in Mathematical and Statistical Methods

Penrose, R.: Gravitational collapse and space-time singularities. Phys. ... Hawking, S.W., Penrose, R.: The singularities of gravitational collapse and cosmology. ... 86, 359–369 (2014) Faraoni, V.: Cosmology in Scalar-Tensor Gravity.

Author: D. Marc Kilgour

Publisher: Springer

ISBN: 9783319997193

Category: Computers

Page: 646

View: 528

This book focuses on the recent development of methodologies and computation methods in mathematical and statistical modelling, computational science and applied mathematics. It emphasizes the development of theories and applications, and promotes interdisciplinary endeavour among mathematicians, statisticians, scientists, engineers and researchers from other disciplines. The book provides ideas, methods and tools in mathematical and statistical modelling that have been developed for a wide range of research fields, including medical, health sciences, biology, environmental science, engineering, physics and chemistry, finance, economics and social sciences. It presents original results addressing real-world problems. The contributions are products of a highly successful meeting held in August 2017 on the main campus of Wilfrid Laurier University, in Waterloo, Canada, the International Conference on Applied Mathematics, Modeling and Computational Science (AMMCS-2017). They make this book a valuable resource for readers interested not only in a broader overview of the methods, ideas and tools in mathematical and statistical approaches, but also in how they can attain valuable insights into problems arising in other disciplines.
Categories: Computers

Accelerated Cosmic Expansion

Accelerated Cosmic Expansion

Therefore, these classes of theories are nothing but scalar-tensor gravity, albeit of a form which had not been studied in depth before 2003 (see [32] for reviews of scalar-tensor gravity; this fact testifies of how little was really ...

Author: Claudia Moreno González

Publisher: Springer Science & Business Media

ISBN: 9783319020631

Category: Science

Page: 222

View: 308

Proceedings from the 2012 Fourth International Meeting on Gravitation and Cosmology, focusing on accelerated cosmic expansion This volume provides both an update and a review of the state of alternative theories of gravity in connection with the accelerated expansion of the universe issue. Different theoretical proposals exist to explain the acceleration in the cosmic expansion, generating the dark energy issue and opening the possibility to theories of gravity alternative to general relativity. Related issues such as the dark matter problem are also surveyed in order to give the readers profound insight on the subject from different points of view. Comprised of short talks and plenary lectures given by leading experts in the field, some of them with brilliant and historic contributions, the book allows the reader to find readable and referenced surveys in topics like f(R) theories, the dark matter and dark energy issues, Modified Newtonian Dynamics (MOND) scenarios, f(T) theories, scalar-tensor theories derived from non-Riemannian geometries, emergent universes, the cosmological constant and other topics of current interest for younger and senior physicists and graduate students. These proceedings are from the Fourth International Meeting on Gravitation and Cosmology, held in Guadalajara, Jalisco, México, from 20 - 25 May, 2012, was sponsored by ICTP- Trieste, Italy and COECyTJAL-Universidad de Guadalajara, México. This event is a series of scientific meetings started in 2004 in Cuba, focusing on current and selected topics in the fields of gravitation and cosmology.
Categories: Science

The Thirteenth Marcel Grossmann Meeting

The Thirteenth Marcel Grossmann Meeting

SCALAR-TENSOR AND MULTISCALAR-TENSOR COSMOLOGY IN THE GENERAL RELATIVITY LIMIT LAUR JARV*, PIRET KUUSK, MARGUS SAAL and ERIK RANDLA Institute of ... Keywords: scalartensor gravity; multiscalartensor gravity; cosmological models 1.

Author: Kjell Rosquist

Publisher: World Scientific

ISBN: 9789814630009

Category: Science

Page: 2800

View: 306

The Marcel Grossmann Meetings seek to further the development of the foundations and applications of Einstein's general relativity by promoting theoretical understanding in the relevant fields of physics, mathematics, astronomy and astrophysics and to direct future technological, observational, and experimental efforts. The meetings discuss recent developments in classical and quantum aspects of gravity, and in cosmology and relativistic astrophysics, with major emphasis on mathematical foundations and physical predictions, having the main objective of gathering scientists from diverse backgrounds for deepening our understanding of spacetime structure and reviewing the current state of the art in the theory, observations and experiments pertinent to relativistic gravitation. The range of topics is broad, going from the more abstract classical theory, quantum gravity, branes and strings, to more concrete relativistic astrophysics observations and modeling. The three volumes of the proceedings of MG13 give a broad view of all aspects of gravitational physics and astrophysics, from mathematical issues to recent observations and experiments. The scientific program of the meeting included 33 morning plenary talks during 6 days, and 75 parallel sessions over 4 afternoons. Volume A contains plenary and review talks ranging from the mathematical foundations of classical and quantum gravitational theories including recent developments in string/brane theories, to precision tests of general relativity including progress towards the detection of gravitational waves, and from supernova cosmology to relativistic astrophysics including such topics as gamma ray bursts, black hole physics both in our galaxy and in active galactic nuclei in other galaxies, and neutron star and pulsar astrophysics. Volumes B and C include parallel sessions which touch on dark matter, neutrinos, X-ray sources, astrophysical black holes, neutron stars, binary systems, radiative transfer, accretion disks, quasors, gamma ray bursts, supernovas, alternative gravitational theories, perturbations of collapsed objects, analog models, black hole thermodynamics, numerical relativity, gravitational lensing, large scale structure, observational cosmology, early universe models and cosmic microwave background anisotropies, inhomogeneous cosmology, inflation, global structure, singularities, chaos, Einstein–Maxwell systems, wormholes, exact solutions of Einstein's equations, gravitational waves, gravitational wave detectors and data analysis, precision gravitational measurements, quantum gravity and loop quantum gravity, quantum cosmology, strings and branes, self-gravitating systems, gamma ray astronomy, and cosmic rays and the history of general relativity. Contents:On the Cosmological Singularity (Vladimir A Belinski)GRB Afterglow Discovery with Bepposax: Its Story 15 Years Later (Filippo Frontera)Rotation, Convection, and Core Collapse (W David Arnett)Spacetime Singularities: Recent Developments (Claes Uggla)Hidden Symmetries: From BKL to Kac–Moody (Philipp Fleig & Hermann Nicolai)Recent Results in Mathematical GR (Sergiu Klainerman)Higher Dimensional Black Holes (Harvey S Reall)Causal Dynamical Triangulations and the Search for a Theory of Quantum Gravity (Jan Ambjorn, Andrzej Görlich, Jerzy Jurkiewicz & Renate Loll)On Quantum Gravity, Asymptotic Safety, and Paramagnetic Dominance (Andreas Nink & Martin Reuter)Perturbative Quantum Gravity as a Double Copy of Gauge Theory and Implications for UV Properties (Zvi Bern)Type Ia Supernova Cosmology: Past and Future (Ariel Goobar)The Energetic Universe: A Nobel Surprise (Robert P Kirshner)Strong, Weak, Electromagnetic and Gravitational Interactions in Neutron Stars (Jorge Rueda & Remo Ruffini)Gravitational-Wave Physics and Astronomy Using Ground-Based Interferometers (David H Reitze & David H Shoemaker)Gamma-Ray Burst Prompt Emission (Bing Zhang)Black Holes, Supernovae and Gamma Ray Bursts (Remo Ruffini)Precisions Tests of Theories of Gravity Using Pulsars (Michael Kramer)The Planck Mission: Recent Results, Cosmological and Fundamental Physics Perspectives (Nazzareno Mandolesi, Carlo Burigana, Alessandro Gruppuso & Paolo Natoli)Observation of a New Boson at a Mass of 125 GeV with the CMS Experiment at the LHC (Chiara Mariotti)Unavoidable CMB Spectral Features and Blackbody Photosphere of Our Universe (Rashid Sunyaev & Rishi Khatri)Search for the Standard Model Higgs Boson with the ATLAS Detector (Domizia Orestano) Readership: Graduate students in astronomy, astrophysics and cosmology, and scientists interested in general relativity, gravitation, astrophysics, quantum gravity, particle physics, cosmology and theoretical physics. Keywords:General Relativity;Gravitation;Astrophysics;Quantum Gravity;Particle Physics;Cosmology;Theoretical Physics
Categories: Science

Accelerated Cosmic Expansion

Accelerated Cosmic Expansion

Proceedings from the 2012 Fourth International Meeting on Gravitation and Cosmology, focusing on accelerated cosmic expansion This volume provides both an update and a review of the state of alternative theories of gravity in connection ...

Author: Claudia Moreno González

Publisher: Springer

ISBN: 3319020625

Category: Science

Page: 222

View: 134

Proceedings from the 2012 Fourth International Meeting on Gravitation and Cosmology, focusing on accelerated cosmic expansion This volume provides both an update and a review of the state of alternative theories of gravity in connection with the accelerated expansion of the universe issue. Different theoretical proposals exist to explain the acceleration in the cosmic expansion, generating the dark energy issue and opening the possibility to theories of gravity alternative to general relativity. Related issues such as the dark matter problem are also surveyed in order to give the readers profound insight on the subject from different points of view. Comprised of short talks and plenary lectures given by leading experts in the field, some of them with brilliant and historic contributions, the book allows the reader to find readable and referenced surveys in topics like f(R) theories, the dark matter and dark energy issues, Modified Newtonian Dynamics (MOND) scenarios, f(T) theories, scalar-tensor theories derived from non-Riemannian geometries, emergent universes, the cosmological constant and other topics of current interest for younger and senior physicists and graduate students. These proceedings are from the Fourth International Meeting on Gravitation and Cosmology, held in Guadalajara, Jalisco, México, from 20 - 25 May, 2012, was sponsored by ICTP- Trieste, Italy and COECyTJAL-Universidad de Guadalajara, México. This event is a series of scientific meetings started in 2004 in Cuba, focusing on current and selected topics in the fields of gravitation and cosmology.
Categories: Science

Relativity and Gravitation

Relativity and Gravitation

Preface -- Statement on the death of Basilis Xanthopoulos -- Canonical Quantum Gravity -- Coarse-Graining and Backreaction in Inflationary and Minisuperspace Cosmology -- Five Lectures on Planar Gravity -- Numerical Relativity -- The Yamabe ...

Author:

Publisher:

ISBN: 9814538655

Category: SCIENCE

Page: 548

View: 234

Categories: SCIENCE