Download e-book for kindle: Beyond Einstein gravity : a survey of gravitational theories by Salvatore Capozziello

By Salvatore Capozziello

ISBN-10: 9400701640

ISBN-13: 9789400701649

ISBN-10: 9400701659

ISBN-13: 9789400701656

Past Einstein{u2019}s Gravity is a graduate point creation to prolonged theories of gravity and cosmology, together with variational ideas, the weak-field restrict, gravitational waves, mathematical instruments, special suggestions, in addition to cosmological and astrophysical functions. The ebook presents a severe assessment of the examine during this quarter and unifies the present literature utilizing a constant notation. Read more...

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This graduate point creation explores the prolonged theories of gravity and cosmology, together with variational rules, the weak-field restrict, gravitational waves, and extra. entire with a Read more...

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Additional resources for Beyond Einstein gravity : a survey of gravitational theories for cosmology and astrophysics

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The former allows for a well-defined measure, whereas the latter is more convenient for perturbative calculations such as, for example, the computation of the S -matrix in QED. These methods have been applied also to GR, but many difficulties arise in this case due to the fact that Einstein’s theory cannot be formulated in terms of a quantum field theory on a fixed Minkowski background. To be more specific, in GR the geometry of the background spacetime cannot be given a priori: spacetime is the dynamical variable itself.

53]). 5 What a good theory of gravity should do: General Relativity and its extensions 17 A number of attempts to generalize GR and unify it with electromagnetism along these lines were followed by Einstein and many others, including Eddington, Weyl, and Schr¨odinger to mention a few [51]. These attempts were eventually abandoned in the 1950s, mainly because of a number of difficulties related to the definitely more complicated structure of a non-linear theory (where by “non-linear” we mean one based on non-linear invariants of the curvature tensor), and also because of the discovery of two new physical interactions, the strong and the weak nuclear forces that required the more general framework of gauge theory [656].

The canonical and covariant approaches provide different answers to these questions. The canonical approach is based on the Hamiltonian formulation of GR and aims at using the canonical quantization procedure. The canonical commutation relations are the same that lead to the uncertainty principle; in fact, the commutation of certain operators on a spatial three-manifold of constant time is imposed, and this three-manifold is fixed in order to preserve the notion of causality. In the limit of asymptotically flat spacetime, the motion generated by the Hamiltonian must be interpreted as temporal evolution (in other words, when the background becomes the Minkowski spacetime, the Hamiltonian operator assumes again its role as the generator of translations).

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Beyond Einstein gravity : a survey of gravitational theories for cosmology and astrophysics by Salvatore Capozziello


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