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Emergent modified gravity.

Emergent modified gravity.

Authors :
Bojowald, Martin
Duque, Erick I
Source :
Classical & Quantum Gravity. 5/2/2024, Vol. 41 Issue 9, p1-18. 18p.
Publication Year :
2024

Abstract

A complete canonical formulation of general covariance makes it possible to construct new modified theories of gravity that are not of higher-curvature form, as shown here in a spherically symmetric setting. The usual uniqueness theorems are evaded by using a crucial and novel ingredient, allowing for fundamental fields of gravity distinct from an emergent space-time metric that provides a geometrical structure to all solutions. As specific examples, there are new expansion-shear couplings in cosmological models, a form of modified Newtonian dynamics can appear in a space-time covariant theory without introducing extra fields, and related effects help to make effective models of canonical quantum gravity fully consistent with general covariance. [ABSTRACT FROM AUTHOR]

Details

Language :
English
ISSN :
02649381
Volume :
41
Issue :
9
Database :
Academic Search Index
Journal :
Classical & Quantum Gravity
Publication Type :
Academic Journal
Accession number :
176466568
Full Text :
https://doi.org/10.1088/1361-6382/ad36a8