Work

Consistent modified gravity: dark energy, acceleration and the absence of cosmic doomsday

Year: 2005

Type: article

Abstract: We discuss modified gravity which includes negative and positive powers of curvature and provides gravitational dark energy. It is shown that in GR plus a term containing a negative power of curvature, cosmic speed-up may be achieved while the effective phantom phase (with w less than −1) follows when such a term contains a fractional positive power of curvature. Minimal coupling with matter makes the situation more interesting: even 1/ R theory coupled with the usual ideal fluid may describe the (effective phantom) dark energy. The account of the R 2 term (consistent modified gravity) may help to escape cosmic doomsday.

Source: Classical and Quantum Gravity

DOI: 10.1088/0264-9381/22/5/l01

Authors: M C B Abdalla, Shin'ichi Nojiri, Sergei D Odintsov

Institutions: Universidade Estadual Paulista (Unesp), National Defense Academy of Japan, Institució Catalana de Recerca i Estudis Avançats, 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: bronze

Funders: Ministry of Education, Culture, Sports, Science and Technology, Fundação de Amparo à Pesquisa do Estado de São Paulo, Conselho Nacional de Desenvolvimento Científico e Tecnológico

Awards: Sergey Dimitrievich Odintsov | Institut d'Estudis Espacials de Catalunya - Espanha, G7256258250