Backreaction due to inhomogeneities and the future evolution of an accelerating universe

Majumdar A.S., Bose N.

S. N. Bose National Centre for Basic Sciences, Block JD, Sector III, Salt Lake, Kolkata, India

E-mail: Majumdar archan@bose.res.in

We investigate the effect of backreaction due to inhomogeneities on theevolution of the present universe by considering a multi-scale model within the Buchert framework. Taking the observed present acceleration of the universe as an essential input, we study the effect of inhomogeneities in the future evolution. We find that the backreaction from inhomogeneities causes the acceleration to slow down in the future for a range of initial configurations and model parameters, and even lead in certain cases to the emergence of a future decelerating epoch.

Keywords: Dark energy, Cosmic backreaction, Large scale structure.

DOI: 10.18698/2309-7604-2015-1-365-373

Article file: Majumdar2.pdf