Work

Is the future universe singular: Dark matter versus modified gravity?

Year: 2010

Type: article

Abstract: The fundamental problem of the occurrence/removal of finite-time future singularity in the universe evolution for coupled Dark Energy (DE) is addressed. It is demonstrated the existence of the (instable or local minimum) de Sitter space solution which may cure the Type II or Type IV future singularity for DE coupled with DM as the result of tuning the initial conditions. In case of phantom DE, the corresponding coupling may help to resolve the coincidence problem but not the Big Rip (Type I) singularity issue. We show that modified gravity of special form or inhomogeneous DE fluid may offer the universal scenario to cure the Type I, II, III or IV future singularity of coupled (fluid or scalar) DE evolution.

Source: Physics Letters B

DOI: 10.1016/j.physletb.2010.02.017

Authors: Shin'ichi Nojiri, Sergei D. Odintsov

Institutions: Nagoya University, Institució Catalana de Recerca i Estudis Avançats, Institute of Space Sciences, Consejo Superior de Investigaciones Científicas

Language: English

Topic: Cosmology and Gravitation Theories

Subfield: Astronomy and Astrophysics

Field: Physics and Astronomy

Domain: Physical Sciences

Open Access status: hybrid

Estimated APC paid: