Evolution of entropic dark energy and its phantom nature

TL;DR

This paper investigates the evolution of entropic dark energy derived from surface terms in Einstein-Hilbert action, revealing its phantom nature and predicting a future big-rip scenario based on supernova data constraints.

Contribution

It introduces a model of entropic dark energy from surface terms and analyzes its evolution, including its phantom behavior and future implications, constrained by observational data.

Findings

Predicts an early decelerated and later accelerated universe.

Shows entropic dark energy exhibits phantom behavior for z<0.257.

Forecasts a big-rip event approximately 36 billion years from now.

Abstract

Assuming the form of the entropic dark energy as arises form the surface term in the Einstein-Hilbert's action, it's evolution were analyzed in an expanding flat universe. The model parameters were evaluated by constraining model using the Union data on Type Ia supernovae. We found that the model predicts an early decelerated phase and a later accelerated phase at the background level. The evolution of the Hubble parameter, dark energy density, equation of state parameter and deceleration parameter were obtained. The model is diagnosed with $Om$ parameter. The model is hardly seems to be supporting the linear perturbation growth for the structure formation. We also found that the entropic dark energy shows phantom nature for redshifts $z<0.257.$ During the phantom epoch, the model predicts big-rip effect at which both the scale factor of expansion and the dark energy density become infinitely large and the big rip time is found to be around 36 Giga Years from now.