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Quantum gravity

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"One of the greatest challenges in fundamental physics is to reconcile quantum mechanics and general relativity in a theory of quantum gravity. A successful theory would have profound consequences for our understanding of space, time and matter. This collection of essays written by eminent physicists and philosophers discusses these consequences and examines the most important conceptual questions among philosophers and physicists in their search for a quantum theory of gravity. Comprised of three parts, the book explores the emergence of classical spacetime, the nature of time, and important questions of the interpretation, metaphysics, and epistemology of quantum gravity. These essays will appeal to both physicists and philosophers of science working on problems in foundational physics, specifically that of quantum gravity"--

Quantum gravity. --- Gravity, Quantum --- General relativity (Physics) --- Gravitation --- Quantum theory --- Quantum gravity

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The characteristic - Planck - energy scale of quantum gravity makes experimental access to the relevant physics apparently impossible. Nevertheless, low energy experiments linking gravity and the quantum have been undertaken: the Page and Geilker quantum Cavendish experiment, and the Colella-Overhauser-Werner neutron interferometry experiment, for instance. However, neither probes states in which gravity remains in a coherent quantum superposition, unlike - it is claimed - recent proposals. In essence, if two initially unentangled subsystems interacting solely via gravity become entangled, then theorems of quantum mechanics show that gravity cannot be a classical subsystem. There are formidable challenges to such an experiment, but remarkably, tabletop technology into the gravity of very small bodies has advanced to the point that such an experiment might be feasible in the near future. This Element explains the proposal and what it aims to show, highlighting the important ways in which its interpretation is theory-laden.

Quantum gravity. --- Gravity, Quantum --- General relativity (Physics) --- Gravitation --- Quantum theory

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The 33 essays in this volume together provide a valuable overview of the progress towards a theory of quantum gravity, and offer succinct treatment of: quantum field theory in curved space-times, supergravity, cosmology, black holes, quantum geometry, supersymmetry and related phenomena.

Quantum gravity --- Gravity, Quantum --- General relativity (Physics) --- Gravitation --- Quantum theory --- DeWitt, Bryce S. --- Quantum gravity. --- DeWitt, Bryce Seligman, --- DeWitt, B. S. --- Seligman, Carl Bryce,

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This second edition offers a comprehensive introduction to loop quantum gravity (LQG) in self-dual variables, including the necessary prerequisites. Additionally, it delves into various significant research areas that have emerged in recent years. New content (including an entirely new chapter dedicated to dynamics of quantum spacetime) explores the description of spin networks and spin-foams, their historical development as well as connections to tensor networks, BF theory, and emerging approaches including the spinorial representation of LQG, SU(2) coherent states, and group field theory. Furthermore, the book provides expanded appendices covering essential tools and concepts, such as the connection between information theory and entropy, and overviews of group theory and differential geometry. All topics are presented from a non-expert perspective, ensuring self-containment and accessibility. The primary aim of this second edition remains helping researchers, bewildered by the vast array of topics within this rapidly growing field of quantum gravity, to gain a fundamental understanding of the current developments.

Quantum gravity. --- Gravetat quàntica --- Gravitation. --- Mathematical physics. --- Mathematics. --- Classical and Quantum Gravity. --- Mathematical Physics. --- Mathematical Methods in Physics. --- Applications of Mathematics.