Work

Dark energy dominance and cosmic acceleration in first-order formalism

Year: 2005

Type: article

Abstract: The current accelerated universe could be produced by modified gravitational dynamics as it can be seen, in particular, in its Palatini formulation. We analyze here a specific nonlinear gravity-scalar system in the first-order Palatini formalism which leads to a Friedmann-Robertson-Walker cosmology different from the purely metric one. It is shown that the emerging Friedmann-Robertson-Walker cosmology may lead either to an effective quintessence phase (cosmic speed-up) or to an effective phantom phase. Moreover, the already known gravity assisted dark energy dominance occurs also in the first-order formalism. Finally, it is shown that a dynamical theory able to resolve the cosmological constant problem exists also in this formalism, in close parallel with the standard metric formulation.

Source: Physical review. D. Particles, fields, gravitation, and cosmology/Physical review. D. Particles and fields

DOI: 10.1103/physrevd.72.063505

Authors: Gianluca Allemandi, Andrzej Borowiec, Mauro Francaviglia, Sergei D. Odintsov

Institutions: University of Turin, University of Wrocław, Institució Catalana de Recerca i Estudis Avançats, Universitat Autònoma de Barcelona, Institute of Space Sciences, Consejo Superior de Investigaciones Científicas, Institut d'Estudis Espacials de Catalunya

Language: English

Topic: Cosmology and Gravitation Theories

Subfield: Astronomy and Astrophysics

Field: Physics and Astronomy

Domain: Physical Sciences

Open Access status: green

OpenAlex ID: W2010142141

FWCI: 12.77

Cites: 48

Cited by: 410

Related to: 10