By Salvatore Capozziello
Beyond Einstein’s Gravity is a graduate point advent to prolonged theories of gravity and cosmology, together with variational ideas, the weak-field restrict, gravitational waves, mathematical instruments, precise ideas, in addition to cosmological and astrophysical purposes. The e-book presents a serious evaluation of the learn during this zone and unifies the prevailing literature utilizing a constant notation. even if the implications practice in precept to all substitute gravities, a different emphasis is on scalar-tensor and f(R) theories. They have been studied by means of theoretical physicists from early on, and within the Nineteen Eighties they seemed in makes an attempt to renormalize normal Relativity and in types of the early universe. lately, those theories have noticeable a brand new rent of lifestyles, in either their metric and metric-affine types, as versions of the current acceleration of the universe with out introducing the mysterious and unique darkish strength. The darkish topic challenge can be addressed in prolonged gravity. those purposes are contributing to a deeper figuring out of the gravitational interplay from either the theoretical and the experimental perspective. an in depth bibliography publications the reader into extra unique literature on specific topics.
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Additional info for Beyond Einstein Gravity: A Survey of Gravitational Theories for Cosmology and Astrophysics
In this sense, this is the first quantum correction to GR. It assumes that matter fields are free and, due to the Equivalence Principle, all forms of matter couple in the same way to gravity. It also implies an intrinsic non-linearity of gravity, so that a number of loops are needed in order to take into account self-interactions or mutual interactions between matter and gravitational fields. At the one-loop level, divergences can be removed by renormalizing the cosmological constant eff and the gravitational constant Geff .
We focus on the time period between the Lense-Thirring 1918 7 Note, however, that the distinction between gravitational and non-gravitational fields becomes representation-dependent in ETGs, together with the various formulations of the EP . 24 1 Extended gravity: a primer gedanken experiment and the formulation of Brans-Dicke theory in 1961. This scalar-tensor theory contained a new important feature, the variability of the gravitational “constant”. It is interesting that theories originally developed to better understand the concept of inertia, the most peculiar property of mass, were recovered in the low-energy limit of string theory in the 1980s and, independent of this fact, are used nowadays to cure the shortcomings of standard cosmology and explain the large-scale distribution of matter observed in the universe.
7 The conformal value D 1=6 is also an infrared fixed point of the renormalization group in finite GUTs [156, 157, 185–190, 423, 820, 864, 933]. Non-minimally coupled scalar fields have been widely used in relation with specific inflationary scenarios [89, 111, 437– 440, 519, 522, 620, 691, 692, 713, 964]. The approach adopted was largely one in which is regarded as a free parameter to be used at will in order to fix possible problems of specific inflationary scenarios; see [446, 449] for more general treatments.
Beyond Einstein Gravity: A Survey of Gravitational Theories for Cosmology and Astrophysics by Salvatore Capozziello