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Quantum Gravity

Quantum Gravity PDF Author: Domenico J. W. Giulini
Publisher: Springer Science & Business Media
ISBN: 9783540408109
Category : Science
Languages : en
Pages : 402

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Book Description
The relation between quantum theory and the theory of gravitation remains one of the most outstanding unresolved issues of modern physics. According to general expectation, general relativity as well as quantum (field) theory in a fixed background spacetime cannot be fundamentally correct. Hence there should exist a broader theory comprising both in appropriate limits, i.e., quantum gravity. This book gives readers a comprehensive introduction accessible to interested non-experts to the main issues surrounding the search for quantum gravity. These issues relate to fundamental questions concerning the various formalisms of quantization; specific questions concerning concrete processes, like gravitational collapse or black-hole evaporation; and the all important question concerning the possibility of experimental tests of quantum-gravity effects.

Quantum Gravity

Quantum Gravity PDF Author: Domenico J. W. Giulini
Publisher: Springer Science & Business Media
ISBN: 9783540408109
Category : Science
Languages : en
Pages : 402

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Book Description
The relation between quantum theory and the theory of gravitation remains one of the most outstanding unresolved issues of modern physics. According to general expectation, general relativity as well as quantum (field) theory in a fixed background spacetime cannot be fundamentally correct. Hence there should exist a broader theory comprising both in appropriate limits, i.e., quantum gravity. This book gives readers a comprehensive introduction accessible to interested non-experts to the main issues surrounding the search for quantum gravity. These issues relate to fundamental questions concerning the various formalisms of quantization; specific questions concerning concrete processes, like gravitational collapse or black-hole evaporation; and the all important question concerning the possibility of experimental tests of quantum-gravity effects.

Quantum Gravity

Quantum Gravity PDF Author: M. Markov
Publisher: Springer Science & Business Media
ISBN: 1461327016
Category : Science
Languages : en
Pages : 548

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Book Description
Three years have passed after the First Moscow Seminar on Quantum Gravity. It is a rather long time interval for the modern theoretical physics. The talks given at the present Second Seminar which took place in October 13-15, 1981 in Moscow contain the discussion of new results obtained during this period and the problems which arose. More than one hundred Soviet scientists and a number of the foreign guests attended this Seminar, which as the previous one was held by the Nuclear Physics Department of the Academy of Sciences of the USSR and the Institute for Nuclear Research of the Academy of Sciences of the USSR. The aim of the Seminar was to discuss the most important problems of the modern Quantum Gravity, namely: i) Quantum Gravity: the state of art; ii) Quantum effects in Cosmology; iii) Quantum black-hole physics; iv) the recent development in Supergravity and v) Quantum Gauge Theories. The Editorial Board expresses its sincere gratitude to all physicists who have contributed to these Proceedings for their cooperation with the Board in respect of time limitation, accurate and patient fulfilment of all tiresome requirements, set by the Board. The talks in the Proceedings are arranged in sections in accordance with their presentation at the Seminar.

Quantum Gravity

Quantum Gravity PDF Author: IntroBooks
Publisher: IntroBooks
ISBN:
Category : Science
Languages : en
Pages : 40

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Book Description
Some of these oscillatory states will be rendered massless particles due to them being in the zero energy state. Another state with spin two is observed and is also known as the graviton. The masses of the massive string states are of the order m ≥ 1/ls. String interactions gets introduced by letting the strings touch each other and then get attached into one single string - These are basically the joining and splitting interactions of strings. The simplest of string theories are the ones that live in ten dimensions and are observed to be supersymmetric. The sum over string theory which are emphasized with Feynman diagrams can be performed and yields finite results. At considerable low energies to the likes of energies lower than mass of the massive string states E ≪ 1/ls the only excitation we will have are gravitons and other massless particles. The interactions of these particles are those of some massless fields and also of Einstein gravity fields.This is exactly how string theory quantize the gravity. The description above is nothing except the perturbative quantization of the theory.

Quantum Gravity

Quantum Gravity PDF Author: Claus Kiefer
Publisher: OUP Oxford
ISBN: 0191628859
Category : Science
Languages : en
Pages : 408

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Book Description
The search for a quantum theory of the gravitational field is one of the great open problems in theoretical physics. This book presents a self-contained discussion of the concepts, methods and applications that can be expected in such a theory. The two main approaches to its construction — the direct quantisation of Einstein's general theory of relativity and string theory — are covered. Whereas the first attempts to construct a viable theory for the gravitational field alone, string theory assumes that a quantum theory of gravity will be achieved only through a unification of all the interactions. However, both employ the general method of quantization of constrained systems, which is described together with illustrative examples relevant for quantum gravity. There is a detailed presentation of the main approaches employed in quantum general relativity: path-integral quantization, the background-field method and canonical quantum gravity in the metric, connection and loop formulations. The discussion of string theory centres around its quantum-gravitational aspects and the comparison with quantum general relativity. Physical applications discussed at length include the quantization of black holes, quantum cosmology, the indications of a discrete structure of spacetime, and the origin of irreversibility. This third edition contains new chapters or sections on quantum gravity phenomenology, Horava-Lifshitz quantum gravity, analogue gravity, the holographic principle, and affine quantum gravity. It will present updates on loop quantum cosmology, the LTB model, asymptotic safety, and various discrete approaches. The third edition also contains pedagogical extensions throughout the text. This book will be of interest to researchers and students working in relativity and gravitation, cosmology, quantum field theory and related topics. It will also be of interest to mathematicians and philosophers of science.

Space-Time Foliation in Quantum Gravity

Space-Time Foliation in Quantum Gravity PDF Author: Yuki Sato
Publisher: Springer
ISBN: 4431549471
Category : Science
Languages : en
Pages : 100

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Book Description
In this thesis, the author considers quantum gravity to investigate the mysterious origin of our universe and its mechanisms. He and his collaborators have greatly improved the analyticity of two models: causal dynamical triangulations (CDT) and n-DBI gravity, with the space-time foliation which is one common factor shared by these two separate models. In the first part, the analytic method of coupling matters to CDT in 2-dimensional toy models is proposed to uncover the underlying mechanisms of the universe and to remove ambiguities remaining in CDT. As a result, the wave function of the 2-dimensional universe where matters are coupled is derived. The behavior of the wave function reveals that the Hausdorff dimension can be changed when the matter is non-unitary. In the second part, the n-DBI gravity model is considered. The author mainly investigates two effects driven by the space-time foliation: the appearance of a new conserved charge in black holes and an extra scalar mode of the graviton. The former implies a breakdown of the black-hole uniqueness theorem while the latter does not show any pathological behavior.

Quantum Gravity

Quantum Gravity PDF Author: Warner Schneider
Publisher: Dorrance Publishing
ISBN: 1480970239
Category : Science
Languages : en
Pages : 66

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Book Description
Quantum Gravity: A Study in Physics and Cosmology By Warner Schneider Albert Einstein determined that gravitation is the curvature of space in proximity to any celestial body of mass. If this is so, then how and why does it occur? And what is the relationship between matter and the fabric of space that allows for it? We can gain a more complete understanding of this force by identifying the various symmetries and field vectors that are replicated between the quantum level, the macrocosm of our universe, and the greater macrocosm lying beyond it. The dynamic underlying the expansion of space is revealed in this way, which goes a long way in explaining the origins of the universe and where it is ultimately headed.

Quantum Gravity

Quantum Gravity PDF Author: Claus Birkholz
Publisher: BookRix
ISBN: 3743848414
Category : Science
Languages : en
Pages : 94

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Book Description
The reproducibility of facts is the hallmark of a natural science, the impossibility of counting up to infinity that of a measuring process, and the "law of great numbers" that of statistics. A statement like "Nothing will come from nothing, and nothing gets lost" will yield conservation laws. Bell's own interpretation of his no-go theorems, then, will directly give Quantum Gravity, and its iteration the unification of all types of forces of nature ("New Physics"). The present paper will outline the reasoning of Quantum Gravity and of New Physics rather than their technical details - as far as all that allows for separating those issues from each other. Thermodynamic principles are imposing 2 alternative channels to us: A closed system will yield the reaction channel conserving probabilty, and an open system the dynamic channel. Causality will mark the open channel, entanglement the reaction channel. Parities are the key to understanding a black hole free of singularities. Space, time, and mass can be counted from the non-valence parts of a particle as occurrence rates of special double-quant properties; Higgs is dispensable. The spectrum of stable particles derives from the representation of our static multiverse. Its building universes give us the illusion of motion (like by a flip book). Lagrange's formalism and its canonical quantization prove as classical dead locks of obsolete centuries. The multitude of positive results - like the fine-structure constant calculated correctly, e.g. - speak in favour of New Physics, the total absence of "broken" quantum numbers in favour of a deeper "understanding" of nature.

Three Roads To Quantum Gravity

Three Roads To Quantum Gravity PDF Author: Lee Smolin
Publisher: Hachette UK
ISBN: 0465013244
Category : Science
Languages : en
Pages : 256

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Book Description
"It would be hard to imagine a better guide to this difficult subject." -- Scientific American In Three Roads to Quantum Gravity, Lee Smolin provides an accessible overview of the attempts to build a final "theory of everything." He explains in simple terms what scientists are talking about when they say the world is made from exotic entities such as loops, strings, and black holes and tells the fascinating stories behind these discoveries: the rivalries, epiphanies, and intrigues he witnessed firsthand. "Provocative, original, and unsettling." -- The New York Review of Books "An excellent writer, a creative thinker." -- Nature

Introduction to Quantum Field Theory with Applications to Quantum Gravity

Introduction to Quantum Field Theory with Applications to Quantum Gravity PDF Author: Iosif L. Buchbinder
Publisher: Oxford University Press
ISBN: 0192575317
Category : Science
Languages : en
Pages : 464

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Book Description
Applications of quantum field theoretical methods to gravitational physics, both in the semiclassical and the full quantum frameworks, require a careful formulation of the fundamental basis of quantum theory, with special attention to such important issues as renormalization, quantum theory of gauge theories, and especially effective action formalism. The first part of this graduate textbook provides both a conceptual and technical introduction to the theory of quantum fields. The presentation is consistent, starting from elements of group theory, classical fields, and moving on to the effective action formalism in general gauge theories. Compared to other existing books, the general formalism of renormalization in described in more detail, and special attention paid to gauge theories. This part can serve as a textbook for a one-semester introductory course in quantum field theory. In the second part, we discuss basic aspects of quantum field theory in curved space, and perturbative quantum gravity. More than half of Part II is written with a full exposition of details, and includes elaborated examples of simplest calculations. All chapters include exercises ranging from very simple ones to those requiring small original investigations. The selection of material of the second part is done using the “must-know” principle. This means we included detailed expositions of relatively simple techniques and calculations, expecting that the interested reader will be able to learn more advanced issues independently after working through the basic material, and completing the exercises.

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 :

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