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Today we are blessed with two extraordinarily successful theories of physics. The first is Albert Einstein's general theory of relativity, which describes the large-scale behaviour of matter in a curved spacetime. This theory is the basis for the standard model of big bang cosmology. The discovery of gravitational waves at the LIGO observatory in the US (and then Virgo, in Italy) is only the most recent of this theory's many triumphs.The second is quantum mechanics. This theory describes the properties and behaviour of matter and radiation at their smallest scales. It is the basis for the standard model of particle physics, which builds up all the visible constituents of the universe out of collections of quarks, electrons and force-carrying particles such as photons. The discovery of the Higgs boson at CERN in Geneva is only the most recent of this theory's many triumphs.But, while they are both highly successful, these two structures leave a lot of important questions unanswered. They are also based on two different interpretations of space and time, and are therefore fundamentally incompatible. We have two descriptions but, as far as we know, we've only ever had one universe. What we need is a quantum theory of gravity.Approaches to formulating such a theory have primarily followed two paths. One leads to String Theory, which has for long been fashionable, and about which much has been written. But String Theory has become mired in problems. In this book, Jim Baggott describes ": an approach which takes relativity as its starting point, and leads to a structure called Loop Quantum Gravity. Baggott tells the story through the careers and pioneering work of two of the theory's most prominent contributors, Lee Smolin and Carlo Rovelli. Combining clear discussions of both quantum theory and general relativity, this book offers one of the first efforts to explain the new quantum theory of space and time.

Quantum theory. --- Space and time. --- Relativity (Physics) --- Gravité quantique --- Théorie quantique --- Espace et temps --- Relativité (physique) --- Univers --- Universe. --- Gravité quantique. --- Théorie quantique. --- Espace et temps. --- Univers. --- Gravité quantique. --- Théorie quantique. --- Relativité (physique)

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Quantum gravity --- String models --- Surfaces (Physics) --- Congresses. --- Gravité quantique --- Gravité quantique --- Modèles des cordes vibrantes (Physique nucléaire) --- Surfaces (Physique) --- Congresses --- Congrès --- Quantum gravity - Congresses --- String models - Congresses. --- Surfaces (Physics) - Congresses.

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Quantum field theory --- Quantum gravity --- String models --- Théorie quantique des champs --- Gravité quantique --- Modèles des cordes vibrantes (Physique nucléaire) --- Congresses --- Congrès --- Théorie quantique des champs --- Gravité quantique --- Modèles des cordes vibrantes (Physique nucléaire) --- Congrès --- Quantum field theory - Congresses --- Quantum gravity - Congresses --- String models - Congresses --- Field theory

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This book, first published in 2007, is an introductory textbook on quantum field theory in gravitational backgrounds intended for undergraduate and beginning graduate students in the fields of theoretical astrophysics, cosmology, particle physics, and string theory. The book covers the basic (but essential) material of quantization of fields in an expanding universe and quantum fluctuations in inflationary spacetime. It also contains a detailed explanation of the Casimir, Unruh, and Hawking effects, and introduces the method of effective action used for calculating the back-reaction of quantum systems on a classical external gravitational field. The broad scope of the material covered will provide the reader with a thorough perspective of the subject. Every major result is derived from first principles and thoroughly explained. The book is self-contained and assumes only a basic knowledge of general relativity. Exercises with detailed solutions are provided throughout the book.

Quantum field theory --- Quantum gravity --- Gravity --- Théorie quantique des champs --- Gravité quantique --- Gravité --- Gravity. --- Quantum field theory. --- Quantum gravity. --- Théorie quantique des champs --- Gravité quantique --- Gravité --- Geophysics --- Mechanics --- Pendulum --- Gravity, Quantum --- General relativity (Physics) --- Gravitation --- Quantum theory --- Relativistic quantum field theory --- Field theory (Physics) --- Relativity (Physics)

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Notre Univers a-t-il un début ? Est-il unique ?La science moderne a révolutionné notre compréhension de l'Univers. Il est maintenant possible de connaître certains aspects des processus qui eurent lieu moins d'un milliardième de milliardième de milliardième de seconde après le Big Bang.Dans cette nouvelle édition actualisée, Aurélien Barrau décrit le cosmos qui se dessine sous nos yeux. Trous noirs, modèle standard de la physique des particules, gravité... les piliers et les énigmes du Big Bang sont abordés les uns après les autres, à la manière d'une balade aux origines de l'Univers.

Big bang theory --- Expanding universe --- Relativistic astrophysics --- Black holes (Astronomy) --- Quantum cosmology --- Cosmic background radiation --- Gravitational waves --- Quantum gravity --- String models --- Big bang --- Univers --- Astrophysique relativiste --- Trous noirs (astronomie) --- Cosmologie quantique --- Rayonnement du fond du ciel --- Rayonnement gravitationnel --- Gravité quantique. --- Modèles des cordes vibrantes (physique nucléaire) --- Expansion --- Big bang theory. --- Expanding universe. --- Relativistic astrophysics. --- Quantum cosmology. --- Cosmic background radiation. --- Gravitational waves. --- Quantum gravity. --- String models. --- Big bang. --- Astrophysique relativiste. --- Cosmologie quantique. --- Rayonnement du fond du ciel. --- Ondes gravitationnelles. --- Théorie des cordes. --- Expansion. --- Gravité quantique. --- Théorie des cordes.