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Introduction to Modified Gravity - Albert Petrov - Bog - Springer International Publishing AG - Plusbog.dk

Introduction to Modified Gravity - Albert Petrov - Bog - Springer International Publishing AG - Plusbog.dk

This book reviews various modified gravity models, including those with modifications in the pure gravitational sector; those involving extra fields, that is, scalar-tensor and vector-tensor gravity theories; gravity models with Lorentz symmetry breaking; and nonlocal gravity models. The authors discuss both classical and quantum aspects of these theories. The book is unique in bringing together all the current alternatives to Einstein gravity in one source and serves as an excellent starting point for graduate students and other newcomers seeking an overview. This second edition has been expanded with new results from a variety of approaches including f(R,Q,P) gravity, galileon gravity and massive gravity. Extended discussions of Lorentz-breaking terms and of non-local field theory have been added and a completely new chapter is devoted to models based on non-Riemannian geometry.

DKK 426.00
1

Introduction to Modified Gravity - Albert Petrov - Bog - Springer Nature Switzerland AG - Plusbog.dk

Introduction to Modified Gravity - Albert Petrov - Bog - Springer Nature Switzerland AG - Plusbog.dk

This book reviews various modified gravity models, including those with modifications in the pure gravitational sector; those involving extra fields, that is, scalar-tensor and vector-tensor gravity theories; gravity models with Lorentz symmetry breaking; and nonlocal gravity models. The authors discuss both classical and quantum aspects of these theories. The book is unique in bringing together all the current alternatives to Einstein gravity in one source and serves as an excellent starting point for graduate students and other newcomers seeking an overview.

DKK 407.00
1

The Trouble With Gravity - Panek - Bog - HarperCollins Publishers Inc - Plusbog.dk

The Trouble With Gravity - Panek - Bog - HarperCollins Publishers Inc - Plusbog.dk

What is gravity? Nobody knows--and just about nobody knows that nobody knows. How something so pervasive can also be so mysterious, and how that mystery can be so wholly unrecognized outside the field of physics, is one of the greatest conundrums in modern science. But as award-winning author Richard Panek shows in this groundbreaking, mind-bending book, gravity is a cold case that's beginning to heat up. In The Trouble with Gravity , Panek invites the reader to experience this ubiquitous yet elusive force in a breathtakingly new way. Gravity, Panek explains, structures not only our bodies and our physical world, but also our minds and culture. From our very beginnings, humans' conceptions of gravity have been inextricably bound to our understanding of existence itself. As we get closer and closer to solving the riddle of gravity, it is not only physics that is becoming clearer. We are also getting to know ourselves as never before.

DKK 160.00
1

Nonlocal Gravity - Bahram Mashhoon - Bog - Oxford University Press - Plusbog.dk

Nonlocal Gravity - Bahram Mashhoon - Bog - Oxford University Press - Plusbog.dk

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.

DKK 1049.00
1

Conversations on Quantum Gravity - - Bog - Cambridge University Press - Plusbog.dk

Conversations on Quantum Gravity - - Bog - Cambridge University Press - Plusbog.dk

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.

DKK 432.00
1

Space-time Symmetry And Quantum Yang-mills Gravity: How Space-time Translational Gauge Symmetry Enables The Unification Of Gravity With Other Forces -

Space-time Symmetry And Quantum Yang-mills Gravity: How Space-time Translational Gauge Symmetry Enables The Unification Of Gravity With Other Forces -

Yang-Mills gravity is a new theory, consistent with experiments, that brings gravity back to the arena of gauge field theory and quantum mechanics in flat space-time. It provides solutions to long-standing difficulties in physics, such as the incompatibility between Einstein's principle of general coordinate invariance and modern schemes for a quantum mechanical description of nature, and Noether's ‘Theorem II’ which showed that the principle of general coordinate invariance in general relativity leads to the failure of the law of conservation of energy. Yang-Mills gravity in flat space-time appears to be more physically coherent than conventional gravity in curved space-time. The problems of quantization of the gravitational field, the operational meaning of space-time coordinates and momenta, and the conservation of energy-momentum are all resolved in Yang-Mills gravity.The aim of this book is to provide a treatment of quantum Yang-Mills gravity, with an emphasis on the ideas and evidence that the gravitational field is the manifestation of space-time translational symmetry in flat space-time, and that there exists a fundamental space-time symmetry framework that can encompass all of physics, including gravity, for all inertial and non-inertial frames of reference.

DKK 935.00
1