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The Geometry of Dynamical Triangulations

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Release : 2009-02-17
Genre : Science
Kind : eBook
Book Rating : 277/5 ( reviews)

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Book Synopsis The Geometry of Dynamical Triangulations by : Jan Ambjorn

Download or read book The Geometry of Dynamical Triangulations written by Jan Ambjorn. This book was released on 2009-02-17. Available in PDF, EPUB and Kindle. Book excerpt: The express purpose of these lecture notes is to go through some aspects of the simplicial quantum gravity model known as the dynamical triangula tions approach. Emphasis has been on laying the foundations of the theory and on illustrating its subtle and often unexplored connections with many distinct mathematical fields ranging from global Riemannian geometry, to moduli theory, number theory, and topology. Our exposition will concentrate on these points so that graduate students may find in these notes a useful exposition of some of the rigorous results one can -establish in this field and hopefully a source of inspiration for new exciting problems. We try as far as currently possible to expose the interplay between the analytical aspects of dynamical triangulations and the results of Monte Carlo simulations. The techniques described here are rather novel and allow us to address points of current interest in the subject of simplicial quantum gravity while requiring very little in the way of fancy field-theoretical arguments. As a consequence, these notes contain mostly original and until now unpublished material, which will hopefully be of interest both to the expert practitioner and to graduate students entering the field. Among the topics addressed here in considerable detail are the following. (i) An analytical discussion of the geometry of dynamical triangulations in dimensions n == 3 and n == 4.

Exploring Causal Dynamical Triangulations

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Release : 2013
Genre :
Kind : eBook
Book Rating : 025/5 ( reviews)

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Book Synopsis Exploring Causal Dynamical Triangulations by : Joshua Harris Cooperman

Download or read book Exploring Causal Dynamical Triangulations written by Joshua Harris Cooperman. This book was released on 2013. Available in PDF, EPUB and Kindle. Book excerpt: Causal dynamical triangulations is a novel approach to lattice regularization of the gravitational path integral. After motivating the study of quantum theories of gravity in general and of causal dynamical triangulations in particular in chapter 1, I introduce the theoretical formalism of causal dynamical triangulations in the context of quantizing Einstein gravity in chapter 2. I then explore a series of five topics in causal dynamical triangulations in the five ensuing chapters. I begin in chapter 3 by considering the gravitational effective action that describes the ensemble average quantum spacetime geometry on sufficiently large scales of (the ground state of a certain phase of) the causal dynamical triangulations of Einstein gravity. This discussion sets the stage for much of the analysis contained in the next four chapters. In chapter 4 I make substantial use of this effective action in developing a method for extracting renormalization group flows of gravitational couplings. Next I present in chapter 5 the spectral dimension, an observable measuring the scale dependent dimensionality of a space that has notably elucidated the physical nature of quantum spacetime geometry emerging from causal dynamical triangulations. Within the causal dynamical triangulations of (2+1)-dimensional Einstein gravity, I study transition amplitudes between past and future spacelike boundaries of fixed intrinsic geometries in chapter 6. Employing the techniques of causal dynamical triangulations, I perform a quantization of (2+1)-dimensional projectable Horava-Lifshitz gravity in chapter 7. Finally, I discuss my ongoing research in and the theoretical prospects for causal dynamical triangulations in chapter 8.

Quantum Geometry

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Release : 1997-06-19
Genre : Science
Kind : eBook
Book Rating : 677/5 ( reviews)

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Book Synopsis Quantum Geometry by : Jan Ambjørn

Download or read book Quantum Geometry written by Jan Ambjørn. This book was released on 1997-06-19. Available in PDF, EPUB and Kindle. Book excerpt: Describes random geometry and applications to strings, quantum gravity, topological field theory and membrane physics.

M-Theory and Quantum Geometry

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Release : 2012-12-06
Genre : Science
Kind : eBook
Book Rating : 03X/5 ( reviews)

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Book Synopsis M-Theory and Quantum Geometry by : Lárus Thorlacius

Download or read book M-Theory and Quantum Geometry written by Lárus Thorlacius. This book was released on 2012-12-06. Available in PDF, EPUB and Kindle. Book excerpt: The fundamental structure of matter and spacetime at the shortest length scales remains an exciting frontier of basic research in theoretical physics. A unifying theme in this area is the quantization of geometrical objects. The majority of lectures at the Advanced Study Institute on Quantum Ge ometry in Akureyri was on recent advances in superstring theory, which is the leading candidate for a unified description of all known elementary par ticles and interactions. The geometric concept of one-dimensional extended objects, or strings, has always been at the core of superstring theory but in recent years the focus has shifted to include also higher-dimensional ob jects, so called D-branes, which play a key role in the non-perturbative dynamics of the theory. A related development has seen the strong coupling regime of a given string theory identified with the weak coupling regime of what was previ ously believed to be a different theory, and a web of such" dualities" that interrelates all known superstring theories has emerged. The resulting uni fied theoretical framework, termed M-theory, has evolved at a rapid pace in recent years.

M-Theory and Quantum Geometry

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Release : 2000-09-30
Genre : Mathematics
Kind : eBook
Book Rating : 757/5 ( reviews)

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Book Synopsis M-Theory and Quantum Geometry by : Lárus Thorlacius

Download or read book M-Theory and Quantum Geometry written by Lárus Thorlacius. This book was released on 2000-09-30. Available in PDF, EPUB and Kindle. Book excerpt: Papers from an August 1999 NATO Advanced Study Institute held in Iceland report on recent advances in superstring theory, which is the leading candidate for a unified description of all known elementary particles and interactions. Chapters examine D-branes in string theory, moduli spaces of Calaba-Yau compactifications, the matrix model of M-theory, the holographic principle, Born-Infeld actions and D-brane physics, superconformal quantum mechanics and multi-black hole moduli spaces, large-N gauge theories, random surfaces, and Lorentzian and Euclidean quantum gravity. The editors are affiliated with the Science Institute of the University of Iceland. Annotation copyrighted by Book News, Inc., Portland, OR

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