Asymptotically Safe Gravity

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Asymptotically Safe Gravity

Author : Alessia Benedetta Platania
Publisher : Springer
ISBN 13 : 3319987941
Total Pages : 142 pages
Book Rating : 4.3/5 (199 download)

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Book Synopsis Asymptotically Safe Gravity by : Alessia Benedetta Platania

Download or read book Asymptotically Safe Gravity written by Alessia Benedetta Platania and published by Springer. This book was released on 2018-09-20 with total page 142 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book seeks to construct a consistent fundamental quantum theory of gravity, which is often considered one of the most challenging open problems in present-day physics. It approaches this challenge using modern functional renormalization group techniques, and attempts to realize the idea of “Asymptotic Safety” originally proposed by S. Weinberg. Quite remarkably, the book makes significant progress regarding both the fundamental aspects of the program and its phenomenological consequences. The conceptual developments pioneer the construction of a well-behaved functional renormalization group equation adapted to spacetimes with a preferred time-direction. It is demonstrated that the Asymptotic Safety mechanism persists in this setting and extends to many phenomenologically interesting gravity-matter systems. These achievements constitute groundbreaking steps towards bridging the gap between quantum gravity in Euclidean and Lorentzian spacetimes.The phenomenological applications cover core topics in quantum gravity, e.g. constructing a phenomenologically viable cosmological evolution based on quantum gravity effects in the very early universe, and analyzing quantum corrections to black holes forming from a spherical collapse.As a key feature, all developments are presented in a comprehensive and accessible way. This makes the work a timely and valuable guide into the rapidly evolving field of Asymptotic Safety.

Quantum Gravity and the Functional Renormalization Group

Author : Martin Reuter
Publisher : Cambridge University Press
ISBN 13 : 1107107326
Total Pages : 357 pages
Book Rating : 4.1/5 (71 download)

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Book Synopsis Quantum Gravity and the Functional Renormalization Group by : Martin Reuter

Download or read book Quantum Gravity and the Functional Renormalization Group written by Martin Reuter and published by Cambridge University Press. This book was released on 2019-01-03 with total page 357 pages. Available in PDF, EPUB and Kindle. Book excerpt: A self-contained pedagogical introduction to asymptotic safety and the functional renormalization group in quantum gravity, for graduate students and researchers.

Fundamental Aspects of Asymptotic Safety in Quantum Gravity

Author : Zoë H. Slade
Publisher : Springer
ISBN 13 : 3030195074
Total Pages : 134 pages
Book Rating : 4.0/5 (31 download)

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Book Synopsis Fundamental Aspects of Asymptotic Safety in Quantum Gravity by : Zoë H. Slade

Download or read book Fundamental Aspects of Asymptotic Safety in Quantum Gravity written by Zoë H. Slade and published by Springer. This book was released on 2019-07-08 with total page 134 pages. Available in PDF, EPUB and Kindle. Book excerpt: After an extensive introduction to the asymptotic safety approach to quantum gravity, this thesis explains recent key advances reported in four influential papers. Firstly, two exact solutions to the reconstruction problem (how to recover a bare action from the effective average action) are provided. Secondly, the fundamental requirement of background independence in quantum gravity is successfully implemented. Working within the derivative expansion of conformally reduced gravity, the notion of compatibility is developed, uncovering the underlying reasons for background dependence generically forbidding fixed points in such models. Thirdly, in order to understand the true nature of fixed-point solutions, one needs to study their asymptotic behaviour. The author carefully explains how to find the asymptotic form of fixed point solutions within the f(R) approximation. Finally, the key findings are summarised and useful extensions of the work are identified. The thesis finishes by considering the need to incorporate matter into the formalism in a compatible way and touches upon potential opportunities to test asymptotic safety in the future.

An Introduction To Covariant Quantum Gravity And Asymptotic Safety

Author : Percacci Roberto
Publisher : World Scientific
ISBN 13 : 9813207191
Total Pages : 312 pages
Book Rating : 4.8/5 (132 download)

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Book Synopsis An Introduction To Covariant Quantum Gravity And Asymptotic Safety by : Percacci Roberto

Download or read book An Introduction To Covariant Quantum Gravity And Asymptotic Safety written by Percacci Roberto and published by World Scientific. This book was released on 2017-02-17 with total page 312 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book covers recent developments in the covariant formulation of quantum gravity. Developed in the 1960s by Feynman and DeWitt, by the 1980s this approach seemed to lead nowhere due to perturbative non-renormalizability. The possibility of non-perturbative renormalizability or "asymptotic safety", originally suggested by Weinberg but largely ignored for two decades, was revived towards the end of the century by technical progress in the field of the renormalization group. It is now a very active field of research, providing an alternative to other approaches to quantum gravity. Written by one of the early contributors to this subject, this book provides a gentle introduction to the relevant ideas and calculational techniques. Several explicit calculations gradually bring the reader close to the current frontier of research. The main difficulties and present lines of development are also outlined.

Fundamental Aspects of Asymptotic Safety in Quantum Gravity

Author : Zoèe H. Slade
Publisher :
ISBN 13 : 9783030195083
Total Pages : 134 pages
Book Rating : 4.1/5 (95 download)

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Book Synopsis Fundamental Aspects of Asymptotic Safety in Quantum Gravity by : Zoèe H. Slade

Download or read book Fundamental Aspects of Asymptotic Safety in Quantum Gravity written by Zoèe H. Slade and published by . This book was released on 2019 with total page 134 pages. Available in PDF, EPUB and Kindle. Book excerpt: After an extensive introduction to the asymptotic safety approach to quantum gravity, this thesis explains recent key advances reported in four influential papers. Firstly, two exact solutions to the reconstruction problem (how to recover a bare action from the effective average action) are provided. Secondly, the fundamental requirement of background independence in quantum gravity is successfully implemented. Working within the derivative expansion of conformally reduced gravity, the notion of compatibility is developed, uncovering the underlying reasons for background dependence generically forbidding fixed points in such models. Thirdly, in order to understand the true nature of fixed-point solutions, one needs to study their asymptotic behaviour. The author carefully explains how to find the asymptotic form of fixed point solutions within the f(R) approximation. Finally, the key findings are summarised and useful extensions of the work are identified. The thesis finishes by considering the need to incorporate matter into the formalism in a compatible way and touches upon potential opportunities to test asymptotic safety in the future.

Quantum Gravity and the Functional Renormalization Group

Author : Martin Reuter
Publisher : Cambridge University Press
ISBN 13 : 1107107326
Total Pages : 357 pages
Book Rating : 4.1/5 (71 download)

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Book Synopsis Quantum Gravity and the Functional Renormalization Group by : Martin Reuter

Understanding the Fundamental Constituents of Matter

Author : Antonio Zichichi
Publisher : Springer Science & Business Media
ISBN 13 : 146840931X
Total Pages : 913 pages
Book Rating : 4.4/5 (684 download)

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Book Synopsis Understanding the Fundamental Constituents of Matter by : Antonio Zichichi

Download or read book Understanding the Fundamental Constituents of Matter written by Antonio Zichichi and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 913 pages. Available in PDF, EPUB and Kindle. Book excerpt: During July and August of 1976 a group of 90 physicists from 56 laboratories in 21 countries met in Erice for the 14th Course of the International School of Subnuclear Physics. The countries represented were Argentina, Australia, Austria, Belgium, Denmark, the Federal Republic of Germany, France, the German Democratic Republic, Greece, Israel, Italy, Japan, Mexico, Nigeria, Norway, Sweden, the United Kingdom, the United States of America, Vietnam, and Yugoslavia. The School was sponsored by the Italian Ministry of Public Education (MPI), the Italian Ministry of Scientific and Technological Research (MRST), the North Atlantic Treaty Organi zation (NATO), the Regional Sicilian Government (ERS), and the Weizmann Institute of Science. The program of the School was mainly devoted to the elucida tion and discussion of the progress achieved in the theoretical and experimental understanding of the fundamental constituents of matter. On the theoretical front we had a series of remarkable lecturers (C. N. Yang, S. Weinberg, G. C. Wick) attempting a description of finite size particles. Another group of lecturers covered such topics as the understanding of the new particles (H. J. Lipkin), whether or not jets really exist (E. Lillethun), and the unexpected A-dependence of massive dileptons produced in high-energy proton- nucleus collisions (J. W. Cronin). Two other outstanding questions were covered by E. Leader and G. Preparata respectively: whether strong interactions are still within the Regge framework, and if it is really possible to master strong interactions. A. J. S.

Asymptotic Safety and Black Holes

Author : Kevin Falls
Publisher : Springer Science & Business Media
ISBN 13 : 3319012940
Total Pages : 185 pages
Book Rating : 4.3/5 (19 download)

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Book Synopsis Asymptotic Safety and Black Holes by : Kevin Falls

Download or read book Asymptotic Safety and Black Holes written by Kevin Falls and published by Springer Science & Business Media. This book was released on 2013-11-26 with total page 185 pages. Available in PDF, EPUB and Kindle. Book excerpt: One of the open challenges in fundamental physics is to combine Einstein's theory of general relativity with the principles of quantum mechancis. In this thesis, the question is raised whether metric quantum gravity could be fundamental in the spirit of Steven Weinberg's seminal asymptotic safety conjecture, and if so, what are the consequences for the physics of small, possibly Planck-size black holes? To address the first question, new techniques are provided which allow, for the first time, a self-consistent study of high-order polynomial actions including up to 34 powers in the Ricci scalar. These novel insights are then exploited to explain quantum gravity effects in black holes, including their horizon and causal structure, conformal scaling, evaporation, and the thermodynamics of quantum space-time. Results indicate upper limits on black hole temperature, and the existence of small black holes based on asymptotic safety for gravity and thermodynamical arguments.

Quantum Gravity and Quantum Cosmology

Author : Gianluca Calcagni
Publisher : Springer
ISBN 13 : 3642330363
Total Pages : 402 pages
Book Rating : 4.6/5 (423 download)

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Book Synopsis Quantum Gravity and Quantum Cosmology by : Gianluca Calcagni

Download or read book Quantum Gravity and Quantum Cosmology written by Gianluca Calcagni and published by Springer. This book was released on 2012-10-31 with total page 402 pages. Available in PDF, EPUB and Kindle. Book excerpt: Quantum gravity has developed into a fast-growing subject in physics and it is expected that probing the high-energy and high-curvature regimes of gravitating systems will shed some light on how to eventually achieve an ultraviolet complete quantum theory of gravity. Such a theory would provide the much needed information about fundamental problems of classical gravity, such as the initial big-bang singularity, the cosmological constant problem, Planck scale physics and the early-time inflationary evolution of our Universe. While in the first part of this book concepts of quantum gravity are introduced and approached from different angles, the second part discusses these theories in connection with cosmological models and observations, thereby exploring which types of signatures of modern and mathematically rigorous frameworks can be detected by experiments. The third and final part briefly reviews the observational status of dark matter and dark energy, and introduces alternative cosmological models. 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.

Coarse Graining in Quantum Gravity: Bridging the Gap between Microscopic Models and Spacetime-Physics

Author : Astrid Eichhorn
Publisher : Frontiers Media SA
ISBN 13 : 2889710491
Total Pages : 298 pages
Book Rating : 4.8/5 (897 download)

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Book Synopsis Coarse Graining in Quantum Gravity: Bridging the Gap between Microscopic Models and Spacetime-Physics by : Astrid Eichhorn

Download or read book Coarse Graining in Quantum Gravity: Bridging the Gap between Microscopic Models and Spacetime-Physics written by Astrid Eichhorn and published by Frontiers Media SA. This book was released on 2021-07-15 with total page 298 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Classical and Quantum Cosmology

Author : Gianluca Calcagni
Publisher : Springer
ISBN 13 : 3319411276
Total Pages : 843 pages
Book Rating : 4.3/5 (194 download)

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Book Synopsis Classical and Quantum Cosmology by : Gianluca Calcagni

Download or read book Classical and Quantum Cosmology written by Gianluca Calcagni and published by Springer. This book was released on 2017-01-06 with total page 843 pages. Available in PDF, EPUB and Kindle. Book excerpt: This comprehensive textbook is devoted to classical and quantum cosmology, with particular emphasis on modern approaches to quantum gravity and string theory and on their observational imprint. It covers major challenges in theoretical physics such as the big bang and the cosmological constant problem. An extensive review of standard cosmology, the cosmic microwave background, inflation and dark energy sets the scene for the phenomenological application of all the main quantum-gravity and string-theory models of cosmology. Born of the author's teaching experience and commitment to bridging the gap between cosmologists and theoreticians working beyond the established laws of particle physics and general relativity, this is a unique text where quantum-gravity approaches and string theory are treated on an equal footing. As well as introducing cosmology to undergraduate and graduate students with its pedagogical presentation and the help of 45 solved exercises, this book, which includes an ambitious bibliography of about 3500 items, will serve as a valuable reference for lecturers and researchers.

Approaches to Quantum Gravity

Author : Daniele Oriti
Publisher : Cambridge University Press
ISBN 13 : 0521860458
Total Pages : 605 pages
Book Rating : 4.5/5 (218 download)

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Book Synopsis Approaches to Quantum Gravity by : Daniele Oriti

Download or read book Approaches to Quantum Gravity written by Daniele Oriti and published by Cambridge University Press. This book was released on 2009-03-05 with total page 605 pages. Available in PDF, EPUB and Kindle. Book excerpt: Containing contributions from leading researchers in this field, this book provides a complete overview of this field from the frontiers of theoretical physics research for graduate students and researchers. It introduces the most current approaches to this problem, and reviews their main achievements.

Why Trust a Theory?

Author : Radin Dardashti
Publisher : Cambridge University Press
ISBN 13 : 110860515X
Total Pages : 451 pages
Book Rating : 4.1/5 (86 download)

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Book Synopsis Why Trust a Theory? by : Radin Dardashti

Download or read book Why Trust a Theory? written by Radin Dardashti and published by Cambridge University Press. This book was released on 2019-03-14 with total page 451 pages. Available in PDF, EPUB and Kindle. Book excerpt: Do we need to reconsider scientific methodology in light of modern physics? Has the traditional scientific method become outdated, does it need to be defended against dangerous incursions, or has it always been different from what the canonical view suggests? To what extent should we accept non-empirical strategies for scientific theory assessment? Many core aspects of contemporary fundamental physics are far from empirically well-confirmed. There is controversy on the epistemic status of the corresponding theories, in particular cosmic inflation, the multiverse, and string theory. This collection of essays is based on the high profile workshop 'Why Trust a Theory?' and provides interdisciplinary perspectives on empirical testing in fundamental physics from leading physicists, philosophers and historians of science. Integrating different contemporary and historical positions, it will be of interest to philosophers of science and physicists, as well as anyone interested in the foundations of contemporary science.

Beyond Spacetime

Author : Nick Huggett
Publisher : Cambridge University Press
ISBN 13 : 110847702X
Total Pages : 371 pages
Book Rating : 4.1/5 (84 download)

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Book Synopsis Beyond Spacetime by : Nick Huggett

Download or read book Beyond Spacetime written by Nick Huggett and published by Cambridge University Press. This book was released on 2020-05-14 with total page 371 pages. Available in PDF, EPUB and Kindle. Book excerpt: A collection of essays discussing the philosophy and foundations of quantum gravity. Written by leading philosophers and physicists in the field, chapters cover the important conceptual questions in the search for a quantum theory of gravity, and the current state of understanding among philosophers and physicists.

General Relativity; an Einstein Centenary Survey

Author : S. W. Hawking
Publisher : CUP Archive
ISBN 13 : 9780521299282
Total Pages : 950 pages
Book Rating : 4.2/5 (992 download)

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Book Synopsis General Relativity; an Einstein Centenary Survey by : S. W. Hawking

Download or read book General Relativity; an Einstein Centenary Survey written by S. W. Hawking and published by CUP Archive. This book was released on 1980-08-28 with total page 950 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Formulations of General Relativity

Author : Kirill Krasnov
Publisher : Cambridge University Press
ISBN 13 : 1108481647
Total Pages : 391 pages
Book Rating : 4.1/5 (84 download)

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Book Synopsis Formulations of General Relativity by : Kirill Krasnov

Download or read book Formulations of General Relativity written by Kirill Krasnov and published by Cambridge University Press. This book was released on 2020-11-26 with total page 391 pages. Available in PDF, EPUB and Kindle. Book excerpt: Carefully documenting the different formulations of general relativity, the author reveals valuable insight into the nature of the gravitational force and its interaction with matter. This book will interest graduate students and researchers in the fields of general relativity, gravitational physics and differential geometry.

New Paths Towards Quantum Gravity

Author : Bernhelm Booß-Bavnbek
Publisher : Springer Science & Business Media
ISBN 13 : 3642118968
Total Pages : 372 pages
Book Rating : 4.6/5 (421 download)

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Book Synopsis New Paths Towards Quantum Gravity by : Bernhelm Booß-Bavnbek

Download or read book New Paths Towards Quantum Gravity written by Bernhelm Booß-Bavnbek and published by Springer Science & Business Media. This book was released on 2010-06-04 with total page 372 pages. Available in PDF, EPUB and Kindle. Book excerpt: Aside from the obvious statement that it should be a theory capable of unifying general relativity and quantum field theory, not much is known about the true nature of quantum gravity. New ideas - and there are many of them for this is an exciting field of research - often diverge to a degree where it seems impossible to decide in which of the many possible direction(s) the ongoing developments should be further sustained. The division of the book in two (overlapping) parts reflects the duality between the physical vision and the mathematical construction. The former is represented by tutorial reviews on non-commutative geometry, on space-time discretization and renormalization and on gauge field path integrals. The latter one by lectures on cohomology, on stochastic geometry and on mathematical tools for the effective action in quantum gravity. The book will benefit everyone working or entering the field of quantum gravity research.