An Effective Cosmological Constant From an Entropic Formulation of Gravity

TL;DR

This paper derives a cosmological model from entropic gravity principles, showing that modifications to the Friedmann equations naturally produce an effective positive cosmological constant, potentially explaining dark energy.

Contribution

It introduces a novel entropic gravity framework that accounts for dark energy through modifications to the Friedmann equations derived from thermodynamic principles.

Findings

Late-time universe exhibits an effective positive cosmological constant.

Modified entropy relations lead to adjustments in Friedmann equations.

Model provides an entropic origin for dark energy.

Abstract

We use the ideas of entropic gravity to derive the FRW cosmological model and show that for late time evolution we have an effective cosmological constant. By using the first law of thermodynamics and the modified entropy area relationship derived from the supersymmetric Wheeler-DeWitt equation of the Schwarzschild black hole, we obtain modifications to the Friedmann equations that in the late time regime gives an effective positive cosmological constant. Therefore, this simple model can account for the dark energy component of the universe by providing an entropic origin to the cosmological constant $\Lambda$.