Self-accelerated universe induced by repulsive effects as an alternative to dark energy and modified gravities

Understand

The existence of current-time universe's acceleration is usually modeled by means of two main strategies.

• The first makes use of a dark energy barotropic fluid entering \emph{by hand} the energy-momentum tensor of Einstein's theory.
• The second lies on extending the Hilbert-Einstein action giving rise to the class of extended theories of gravity.
• In this work, we propose a third approach, derived as an intrinsic geometrical effect of space-time, which provides repulsive regions under certain circumstances.