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The holy grail of theoretical physics is to find the theory of everything that combines all the forces of nature, including gravity. This book addresses the question: how far are we from such discovery? Over the last few decades, multiple roads to finding a quantum theory of gravity have been proposed but no obvious description of nature has emerged in this domain. What is to be made of this situation? This volume probes the state-of-the art in this daunting quest of theoretical physics by collecting critical interviews with nearly forty leading theorists in this field. These broad-ranging conversations give important insights and candid opinions on the various approaches to quantum gravity, including string theory, loop quantum gravity, causal set theory and asymptotic safety. This unique, readable overview provides a gateway into cutting edge research for students and others who wish to engage with the open problem of quantum gravity.

Quantum gravity.

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En suivant deux fils rouges, l'histoire des grandes révolutions de la physique au xxe siècle et l'abstraction progressive du concept de symétrie, de son usage ordinaire en géométrie à son application aux lois de la physique, cette leçon inaugurale aborde un des défis majeurs de la physique actuelle, celui de réconcilier la relativité d'Einstein et la mécanique quantique, théories amplement vérifiées empiriquement et pourtant incompatibles.C'est peut-être dans une symétrie immense, décrite en théorie des groupes par des groupes très particuliers, que réside la clé pour formuler cette théorie plus fondamentale de la gravitation, qui pourrait permettre la grande synthèse avec la mécanique quantique.Marc Henneaux est physicien, professeur à l'Université libre de Bruxelles puis au Collège de France où il devient titulaire, en décembre 2017, de la chaire Champs, cordes et gravité. Il dirige également depuis 2004 les instituts internationaux Solvay de physique et de chimie. [source éditeur]

Symmetry (Physics) --- Group theory --- Gravitation --- Quantum theory. --- Symétrie (physique). --- Théorie des groupes --- Gravitation. --- Théorie quantique --- Quantum gravity

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This book celebrates the 80 years of the Professor Eugene P. Wigner paper “On Unitary Representations of the Inhomogeneous Lorentz Group", published in The Annals of Mathematics in 1939. We have collected several contributions divided into Research articles and Reviews. All contributions are technical, but the papers also bring a health element of didactic. Practitioners from several areas, from Gravity to Quantum Field Theory and Quantum Mechanics, as well as students, shall find a rich material in this Volume.

Research & information: general --- spinors in 4d --- regularization --- anomalies --- quantum gravity --- quantum mechanics --- symmetry --- quantum cosmology --- special relativity --- combination of velocities --- wigner angle --- quaternions --- gauge field theory --- Yang-Mills fields --- modified gravity --- non-Riemannian geometry --- spacetime symmetries --- gauge field theories --- gauge anomalies --- nonperturbative techniques --- ray representation --- strongly continuous --- continuity --- Hilbert space --- entanglement --- bispinors --- chirality --- n/a

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This book celebrates the 80 years of the Professor Eugene P. Wigner paper “On Unitary Representations of the Inhomogeneous Lorentz Group", published in The Annals of Mathematics in 1939. We have collected several contributions divided into Research articles and Reviews. All contributions are technical, but the papers also bring a health element of didactic. Practitioners from several areas, from Gravity to Quantum Field Theory and Quantum Mechanics, as well as students, shall find a rich material in this Volume.

Research & information: general --- spinors in 4d --- regularization --- anomalies --- quantum gravity --- quantum mechanics --- symmetry --- quantum cosmology --- special relativity --- combination of velocities --- wigner angle --- quaternions --- gauge field theory --- Yang-Mills fields --- modified gravity --- non-Riemannian geometry --- spacetime symmetries --- gauge field theories --- gauge anomalies --- nonperturbative techniques --- ray representation --- strongly continuous --- continuity --- Hilbert space --- entanglement --- bispinors --- chirality

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Among the great ironies of quantum mechanics is not only that its conceptual foundations seem strange even to the physicists who use it, but that philosophers have largely ignored it. Here, Bernard d'Espagnat argues that quantum physics--by casting doubts on once hallowed concepts such as space, material objects, and causality-demands serious reconsideration of most of traditional philosophy. On Physics and Philosophy is an accessible, mathematics-free reflection on the philosophical meaning of the quantum revolution, by one of the world's leading authorities on the subject. D'Espagnat presents an objective account of the main guiding principles of contemporary physics-in particular, quantum mechanics-followed by a look at just what consequences these should imply for philosophical thinking. The author begins by describing recent discoveries in quantum physics such as nonseparability, and explicating the significance of contemporary developments such as decoherence. Then he proceeds to set various philosophical theories of knowledge--such as materialism, realism, Kantism, and neo-Kantism--against the conceptual problems quantum theory raises. His overall conclusion is that while the physical implications of quantum theory suggest that scientific knowledge will never truly describe mind-independent reality, the notion of such an ultimate reality--one we can never access directly or rationally and which he calls "veiled reality"--remains conceptually necessary nonetheless.

Physics --- Philosophy. --- Albert Einstein. --- Aristotelian physics. --- Atomic physics. --- Atomic theory. --- Atomism. --- Baruch Spinoza. --- Bell's theorem. --- Classical electromagnetism. --- Classical mechanics. --- Classical physics. --- Concept. --- Consciousness. --- Contemporary Physics. --- Explanation. --- Foundations of Physics. --- Hidden variable theory. --- Hypothesis. --- Interpretations of quantum mechanics. --- Materialism. --- Measurement in quantum mechanics. --- Measurement. --- Modern physics. --- Naturalism (philosophy). --- Objectivity (philosophy). --- Objectivity (science). --- Ontology. --- Phenomenon. --- Philosopher. --- Philosophical realism. --- Philosophical theory. --- Philosophy of mathematics. --- Philosophy of science. --- Physicist. --- Physics World. --- Prediction. --- Probability. --- Quantum cosmology. --- Quantum decoherence. --- Quantum electrodynamics. --- Quantum entanglement. --- Quantum field theory. --- Quantum gravity. --- Quantum logic. --- Quantum mechanics. --- Quantum superposition. --- Quantum system. --- Reality. --- Reason. --- Scalar (physics). --- Science. --- Scientific Data (journal). --- Scientific notation. --- Scientific realism. --- Scientific theory. --- Scientist. --- Solid-state physics. --- Special relativity. --- State of affairs (philosophy). --- Statistical ensemble (mathematical physics). --- The Evolution of Physics. --- The Philosopher. --- Theoretical physics. --- Theory. --- Thought. --- Wave function.