Work

Friedmann equations in the Codazzi parametrization of Cotton and extended theories of gravity and the dark sector

Year: 2024

Type: article

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 $\mathrm{\ensuremath{\Lambda}}\mathrm{CDM}$, as the Chevallier-Polarski-Lindler model.

Source: Physical review. D/Physical review. D.

DOI: 10.1103/physrevd.109.044059

Authors: Carlo Alberto Mantica, Luca Guido Molinari

Institutions: University of Milan, Istituto Nazionale di Fisica Nucleare, Sezione di Milano

Language: English

Topic: Cosmology and Gravitation Theories

Subfield: Astronomy and Astrophysics

Field: Physics and Astronomy

Domain: Physical Sciences

Open Access status: green

OpenAlex ID: W4392041199

FWCI: 2.861

Cites: 57

Cited by: 15

Related to: 10