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An Introduction To Covariant Quantum Gravity And Asymptotic Safety

An Introduction To Covariant Quantum Gravity And Asymptotic Safety PDF Author: Roberto Percacci
Publisher: World Scientific
ISBN: 9813207191
Category : Science
Languages : en
Pages : 313

Book Description
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.

An Introduction To Covariant Quantum Gravity And Asymptotic Safety

An Introduction To Covariant Quantum Gravity And Asymptotic Safety PDF Author: Roberto Percacci
Publisher: World Scientific
ISBN: 9813207191
Category : Science
Languages : en
Pages : 313

Book Description
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.

Conversations on Quantum Gravity

Conversations on Quantum Gravity PDF Author: Jácome Armas
Publisher: Cambridge University Press
ISBN: 1107168872
Category : Biography & Autobiography
Languages : en
Pages : 719

Book Description
Leading theorists share their important insights into the ongoing quest of theoretical physics to find a quantum theory of gravity.

Time and Timelessness in Fundamental Physics and Cosmology

Time and Timelessness in Fundamental Physics and Cosmology PDF Author: Silvia De Bianchi
Publisher: Springer Nature
ISBN: 3031618602
Category :
Languages : en
Pages : 307

Book Description


Quantum Gravity and the Functional Renormalization Group

Quantum Gravity and the Functional Renormalization Group PDF Author: Martin Reuter
Publisher: Cambridge University Press
ISBN: 1108608124
Category : Science
Languages : en
Pages : 357

Book Description
During the past two decades the gravitational asymptotic safety scenario has undergone a major transition from an exotic possibility to a serious contender for a realistic theory of quantum gravity. It aims at a mathematically consistent quantum description of the gravitational interaction and the geometry of spacetime within the realm of quantum field theory, which keeps its predictive power at the highest energies. This volume provides a self-contained pedagogical introduction to asymptotic safety, and introduces the functional renormalization group techniques used in its investigation, along with the requisite computational techniques. The foundational chapters are followed by an accessible summary of the results obtained so far. It is the first detailed exposition of asymptotic safety, providing a unique introduction to quantum gravity and it assumes no previous familiarity with the renormalization group. It serves as an important resource for both practising researchers and graduate students entering this maturing field.

From the Fermi Scale to Cosmology

From the Fermi Scale to Cosmology PDF Author: Alberto Salvio
Publisher: Frontiers Media SA
ISBN: 2889632059
Category :
Languages : en
Pages : 265

Book Description


Isolated Objects in Quadratic Gravity

Isolated Objects in Quadratic Gravity PDF Author: Samuele Silvervalle
Publisher: Springer Nature
ISBN: 3031489942
Category : Science
Languages : en
Pages : 197

Book Description
One of the main unanswered question of modern Physics is "How does gravity behave at small scales?". The aim of this thesis is to illustrate in a comprehensive but accessible way how to look for deviations from Einstein's theory of General Relativity in this regime, looking at the simplest celestial bodies: static and spherically symmetric ones. With a conservative and bottom-up approach, at smaller scales the first corrections to the action of General Relativity are generally considered to be terms quadratic in the curvature tensors; while these modifications do not cure the inconsistency between gravity and quantum mechanics, the solutions of this theory are plausible candidates to be the first-order corrections of the classical ones. Even with such simple modifications, a striking picture emerges from the study of isolated objects: the unique Schwarzschild solution of General Relativity is only a rare bird in the set of solutions, with non-Schwarzschild black holes, wormholes and naked singularities appearing as possible substitutes. Tailored to graduate students and researchers entering this field, this thesis shows how to construct these new solutions from action principles, how to characterize their metric, how to study their physical properties, such as their stability or Thermodynamics, and how to look for phenomenological signatures.

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

Coarse Graining in Quantum Gravity: Bridging the Gap between Microscopic Models and Spacetime-Physics PDF Author: Astrid Eichhorn
Publisher: Frontiers Media SA
ISBN: 2889710491
Category : Science
Languages : en
Pages : 298

Book Description


Progress in Group Field Theory and Related Quantum Gravity Formalisms

Progress in Group Field Theory and Related Quantum Gravity Formalisms PDF Author: Steffen Gielen
Publisher: MDPI
ISBN: 3039361783
Category : Mathematics
Languages : en
Pages : 338

Book Description
Following the fundamental insights from quantum mechanics and general relativity, geometry itself should have a quantum description; the search for a complete understanding of this description is what drives the field of quantum gravity. Group field theory is an ambitious framework in which theories of quantum geometry are formulated, incorporating successful ideas from the fields of matrix models, ten-sor models, spin foam models and loop quantum gravity, as well as from the broader areas of quantum field theory and mathematical physics. This special issue collects recent work in group field theory and these related approaches, as well as other neighbouring fields (e.g., cosmology, quantum information and quantum foundations, statistical physics) to the extent that these are directly relevant to quantum gravity research.

Progress and Visions in Quantum Theory in View of Gravity

Progress and Visions in Quantum Theory in View of Gravity PDF Author: Felix Finster
Publisher: Springer Nature
ISBN: 3030389413
Category : Science
Languages : en
Pages : 302

Book Description
This book focuses on a critical discussion of the status and prospects of current approaches in quantum mechanics and quantum field theory, in particular concerning gravity. It contains a carefully selected cross-section of lectures and discussions at the seventh conference “Progress and Visions in Quantum Theory in View of Gravity” which took place in fall 2018 at the Max Planck Institute for Mathematics in the Sciences in Leipzig. In contrast to usual proceeding volumes, instead of reporting on the most recent technical results, contributors were asked to discuss visions and new ideas in foundational physics, in particular concerning foundations of quantum field theory. A special focus has been put on the question of which physical principles of quantum (field) theory can be considered fundamental in view of gravity. The book is mainly addressed to mathematicians and physicists who are interested in fundamental questions of mathematical physics. It allows the reader to obtain a broad and up-to-date overview of a fascinating active research area.

Quantum Gravity

Quantum Gravity PDF Author: Claus Kiefer
Publisher: Oxford University Press
ISBN: 0199585202
Category : Mathematics
Languages : en
Pages : 406

Book Description
Quantum theory and Einstein's theory of relativity are at the centre of modern theoretical physics, yet, the consistent unification of both theories is still elusive. This book offers an up-to-date introduction into the attempts to construct a unified theory of "quantum gravity".