The quantum effect on Friedmann equation in FRW universe

TL;DR

This paper investigates how quantum effects modify the Friedmann equation in an FRW universe, incorporating new entropy relations and Padmanabhan's emergent space concept, and explores bounce cosmology solutions.

Contribution

It introduces a quantum-corrected Friedmann equation based on a new entropy-area relation and Padmanabhan's emergent space framework, proposing potential bounce cosmologies.

Findings

Quantum effects alter the Friedmann equation.

Bounce solutions are possible in flat geometry.

New entropy-area relation influences cosmic dynamics.

Abstract

We study the modified Friedmann equation in the Friedmann-Robertson-Walker universe with quantum effect. Our modified results mainly stem from the new entropy-area relation and the novel idea of T. Padmanabhan, who considers the cosmic space to be emerged from the cosmic time progresses, so that the expansion rate of the universe is determined by the difference of degrees of freedom between the holographic surface and the bulk inside. We also discuss the possibility of having bounce cosmological solution from the modified Friedmann equation in spatially flat geometry.