Author:
de Cesare Marco,Gubitosi Giulia
Abstract
Abstract
We study the dynamics of the homogeneous and isotropic cosmological background in the
recently proposed “quantum phenomenological gravitational dynamics”, characterised by
logarithmic corrections to the Bekenstein entropy. We show that the model admits a family of
solutions that are self-accelerating both at early and late times: they approach de Sitter in the
future and admit a past attractor corresponding to an inflationary acceleration era. On the other
hand, there are no solutions corresponding to a primordial bounce. We also show that asking scalar
perturbations to be unaffected by instabilities on observable scales puts stringent constraints on
the deviations from general relativity encoded by the model.
Subject
Astronomy and Astrophysics