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Unimodular Gravity vs General Relativity: a Status Report by Raúl Carballo-Rubio; Luis J Garay; Gerardo García-Moreno is a Physics and Astronomy article available to read on EtoBox.

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## Abstract Unimodular gravity (UG) is an alternative to general relativity (GR) which, however, is so closely related to the latter that one can wonder to what extent they are different. The different behaviour of the cosmological constant in the semiclassical regimes of both frameworks suggests the possible existence of additional contrasting features. UG and GR are based on two different gauge symmetries: UG is based on transverse diffeomorphisms and Weyl rescalings (WTDiff transformations), whereas GR is based on the full group of diffeomorphisms. This difference is related to the existence of a fiduciary background structure, a fixed volume form, in UG theories. In this work we present an overview as complete as possible of situations and regimes in which one might suspect that some differences between these two theories might arise. This overview contains analyses in the classical, semiclassical, and quantum regimes. When a particular situation is well known we make just a brief description of its status. For situations less analysed in the literature we provide here more complete analyses. Whereas some of these analyses are sparse through the literature, many of them are new

Who reads Unimodular Gravity vs General Relativity: a Status Report?

Author

Raúl Carballo-Rubio; Luis J Garay; Gerardo García-Moreno

Publisher

IOP Publishing

Published

2022

Language

EN

Field

Physics and Astronomy (Physical Sciences)