Friedmann equations in the Codazzi parametrization of Cotton and extended theories of gravity and the dark sector
Articolo
Data di Pubblicazione:
2024
Citazione:
Friedmann equations in the Codazzi parametrization of Cotton and extended theories of gravity and the dark sector / C.A. Mantica, L.G. Molinari. - In: PHYSICAL REVIEW D. - ISSN 2470-0010. - 109:4(2024), pp. 044059.1-044059.12. [Epub ahead of print] [10.1103/physrevd.109.044059]
Abstract:
The Friedmann equations of Cotton gravity provide a simple parametrization to reproduce, by tuning a single function, the Friedmann equations of several extensions of gravity, such as f(R), modified Gauss- Bonnet f(G), teleparallel f(T), and more. It also includes the recently proposed conformal Killing gravity and mimetic gravity in Friedmann-Robertson-Walker space-times. The extensions generally have the form of a Codazzi tensor that may be associated to the dark sector. Fixing it by a suitable equation of state accomodates most of the postulated models that extend ΛCDM, as the Chevallier-Polarski-Lindler model.
Tipologia IRIS:
01 - Articolo su periodico
Keywords:
FRW spacetime; cosmology; Cotton gravity; Codazzi tensor; extended theories of gravity; dark sector
Elenco autori:
C.A. Mantica, L.G. Molinari
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