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The standard model of particle physics describes our current understanding of nature's fundamental particles and their interactions, yet gaps remain. For example, it does not include a quantum theory of gravity, nor does it explain the existence of dark matter. Once complete, however, the standard model could provide a unified description of the very building blocks of the universe. Researchers have been chasing this dream for decades, and many wonder whether such a dream can ever be made a reality. "Can the Laws of Physics Be Unified ?" is a short introduction to this exciting frontier of physics. The book is accessibly written for students and researchers across the sciences, and for scientifically minded general readers. Paul Langacker begins with an overview of the key breakthroughs that have shaped the standard model, and then describes the fundamental particles, their interactions, and their role in cosmology. He goes on to explain field theory, internal symmetries, Yang-Mills theories, strong and electroweak interactions, the Higgs boson discovery, and neutrino physics. Langacker then looks at the questions that are still unanswered : What is the nature of the mysterious dark matter and dark energy that make up roughly 95 percent of the universe ? Why is there more matter than antimatter ? How can we reconcile quantum mechanics and general relativity ? Can the Laws of Physics Be Unified? describes the promising theoretical ideas and new experiments that could provide answers and weighs our prospects for establishing a truly unified theory of the smallest constituents of nature and their interactions.

Particles (Nuclear physics) --- Standard model (Nuclear physics) --- Particules (physique nucléaire) --- Modèle standard (physique nucléaire)

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This book takes the reader from some elementary ideas about groups to the essence of the Standard Model of particle physics along a relatively straight and intuitive path. Groups alone are first used to arrive at a classical analog of the Dirac equation. Using elementary quantum mechanics, this analog can be turned into the actual Dirac equation, which governs the motion of the quarks and leptons of the Standard Model. After an introduction to the gauge principle, the groups introduced in the beginning of the book are used to give an introduction to the Standard Model. The idea is to give an Olympian view of this evolution, one that is often missing when absorbing the detailed subject matter of the Standard Model as presented in an historical approach to the subject.

Standard model (Nuclear physics) --- Particles (Nuclear physics) --- Group theory. --- Modèle standard (physique nucléaire) --- Particules (physique nucléaire) --- Groupes, Théorie des.

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Particles (Nuclear physics) --- Nuclear physics --- Nuclear physics. --- Elementary particles (Physics) --- High energy physics --- Nuclear particles --- Nucleons --- Atomic nuclei --- Atoms, Nuclei of --- Nucleus of the atom --- Physics --- Experiments --- Data processing --- Data processing. --- Particules (Physique nucléaire) --- Physique nucléaire --- Expériences --- Informatique

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Relativity theory is based on a postulate of locality, which means that the past history of the observer is not directly taken into account. This book argues that the past history should be taken into account. In this way, nonlocality--in the sense of history dependence--is introduced into relativity theory. The deep connection between inertia and gravitation suggests that gravity could be nonlocal, and in nonlocal gravity the fading gravitational memory of past events must then be taken into account. Along this line of thought, a classical nonlocal generalization of Einstein's theory of gravitation has recently been developed.A significant consequence of this theory is that the nonlocal aspect of gravity appears to simulate dark matter. According to nonlocal gravity theory, what astronomers attribute to dark matter should instead be due to the nonlocality of gravitation. Nonlocality dominates on the scale of galaxies and beyond. Memory fades with time; therefore, the nonlocal aspect of gravity becomes weaker as the universe expands.The implications of nonlocal gravity are explored in this book for gravitational lensing, gravitational radiation, the gravitational physics of the Solar System and the internal dynamics of nearby galaxies, as well as clusters of galaxies. This approach is extended to nonlocal Newtonian cosmology, where the attraction of gravity fades with the expansion of the universe. Thus far, scientists have only compared some of the consequences of nonlocal gravity with astronomical observations.

Relativity (Physics) --- Gravitational fields --- Quantum cosmology --- Particles (Nuclear physics) --- Champs gravitationnels. --- Relativité (physique) --- Cosmologie quantique. --- Particules (physique nucléaire)

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Physics --- Plasma (Ionized gases) --- Nuclear physics --- Astrophysics --- Geophysics --- Technology --- Physique --- Plasma (Gaz ionisés) --- Physique nucléaire --- Astrophysique --- Géophysique --- Astrophysics. --- Geophysics. --- Technology. --- Research --- Recherche --- Research.