Future deceleration due to cosmic backreaction in presence of the event horizon

TL;DR

This paper investigates how the universe's future event horizon influences cosmic backreaction, showing that it can slow down acceleration and lead to eventual deceleration, preventing a big rip scenario.

Contribution

It introduces the effect of the cosmological event horizon on backreaction, demonstrating a transition from acceleration to deceleration in the universe's future evolution.

Findings

Backreaction causes acceleration to slow down after the present era.

Transition from acceleration to deceleration occurs, avoiding a big rip.

Event horizon influences the long-term dynamics of cosmic expansion.

Abstract

The present acceleration of the universe leads to the formation of a cosmological future event horizon. We explore the effects of the event horizon on cosmological backreaction due to inhomogeneities in the universe. Beginning from the onset of the present accelerated era, we show that backreaction in presence of the event horizon causes acceleration to slow down in the subsequent evolution. Transition to deceleration occurs eventually, ensuring avoidance of a big rip.