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Theory of relativity. Unified field theory --- General relativity (Physics) --- Mineralogy. --- 531.5 --- 530.12 --- Gravity. Gravitation. Pendulums. Ballistics --- Relativity principle --- 530.12 Relativity principle --- 531.5 Gravity. Gravitation. Pendulums. Ballistics

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This book invites the reader to understand our Universe, not just marvel at it. From the clock-like motions of the planets to the catastrophic collapse of a star into a black hole, gravity controls the Universe. Gravity is central to modern physics, helping to answer the deepest questions about the nature of time, the origin of the Universe and the unification of the forces of nature. Linking key experiments and observations through careful physical reasoning, the author builds the reader's insight step-by-step from simple but profound facts about gravity on Earth to the frontiers of research. Topics covered include the nature of stars and galaxies, the mysteries of dark matter and dark energy, black holes, gravitational waves, inflation and the Big Bang. Suitable for general readers and for undergraduate courses, the treatment uses only high-school level mathematics, supplemented by optional computer programs, to explain the laws of physics governing gravity.

Gravitation. --- Gravity. --- Geophysics --- Mechanics --- Pendulum --- Field theory (Physics) --- Matter --- Physics --- Antigravity --- Centrifugal force --- Relativity (Physics) --- Properties --- Gravitation --- Gravity --- 531.5 --- 531.5 Gravity. Gravitation. Pendulums. Ballistics --- Gravity. Gravitation. Pendulums. Ballistics

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One appealing feature of string theory is that it provides a theory of quantum gravity. Gravity and Strings is a self-contained, pedagogical exposition of this theory, its foundations and its basic results. In Part I, the foundations are traced back to the very early special-relativistic field theories of gravity, showing how such theories lead to general relativity. Gauge theories of gravity are then discussed and used to introduce supergravity theories. In Part II, some of the most interesting solutions of general relativity and its generalizations are studied. The final Part presents and studies string theory from the effective action point of view, using the results found earlier in the book as background. This 2004 book will be useful as a reference book for graduate students and researchers, as well as a complementary textbook for courses on gravity, supergravity and string theory.

Quantum gravity --- String models --- Gravité quantique --- Modèles des cordes vibrantes (Physique nucléaire) --- Quantum gravity. --- String models. --- 531.5 --- 530.145 --- Models, String --- String theory --- Nuclear reactions --- Gravity, Quantum --- General relativity (Physics) --- Gravitation --- Quantum theory --- Gravity. Gravitation. Pendulums. Ballistics --- 530.145 Quantum theory --- 531.5 Gravity. Gravitation. Pendulums. Ballistics --- Gravité quantique --- Modèles des cordes vibrantes (Physique nucléaire)

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This textbook on the nature of space and time explains the new theory of Space Dynamics, which describes the dynamics of gravity as the evolution of conformal 3-dimensional geometry. Shape Dynamics is equivalent to Einstein's General Relativity in those situations in which the latter has been tested experimentally, but the theory is based on different first principles. It differs from General Relativity in certain extreme conditions. Shape Dynamics allows us to describe situations in which the spacetime picture is no longer adequate, such as in the presence of singularities, when the idealization of infinitesimal rods measuring scales and infinitesimal clocks measuring proper time fails. This tutorial book contains both a quick introduction for readers curious about Shape Dynamics, and a detailed walk-through of the historical and conceptual motivations for the theory, its logical development from first principles and a description of its present status. It includes an explanation of the origin of the theory, starting from problems posed first by Newton more than 300 years ago. The book will interest scientists from a large community including all foundational fields of physics, from quantum gravity to cosmology and quantum foundations, as well as researchers interested in foundations. The tutorial is sufficiently self-contained for students with some basic background in Lagrangian/Hamiltonian mechanics and General Relativity.

Relativity (Physics) --- Gravitation. --- Quantum theory. --- Space and time. --- Relationism. --- Physics --- Mathematical physics. --- Relativité (physique) --- Physique mathématique. --- Physique --- Espace et temps. --- Théorie quantique. --- Relationnisme. --- Philosophy. --- Philosophie --- Philosophie. --- 531.5 --- 530.12 --- 531.5 Gravity. Gravitation. Pendulums. Ballistics --- Gravity. Gravitation. Pendulums. Ballistics --- 530.12 Relativity principle --- Relativity principle --- Relativité (physique) --- Physique mathématique. --- Théorie quantique.

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531.5 --- 539.12 --- 536.76 --- Gravity. Gravitation. Pendulums. Ballistics --- Elementary and simple particles (charge less than 3 including alpha-rays, beta-rays, gamma-rays as individual particles or as radiation) --- Relationships deduced from the two laws of thermodynamics. Phase transformations --- 536.76 Relationships deduced from the two laws of thermodynamics. Phase transformations --- 539.12 Elementary and simple particles (charge less than 3 including alpha-rays, beta-rays, gamma-rays as individual particles or as radiation) --- 531.5 Gravity. Gravitation. Pendulums. Ballistics