Cyclic Entropy: An Alternative to Inflationary Cosmology

TL;DR

This paper proposes a cyclic universe model where entropy is reset at each cycle's turnaround by selecting the introverse from the extroverse, explaining homogeneity and flatness without inflation.

Contribution

It introduces a novel mechanism for entropy reset at each cycle's turnaround by selecting the introverse, offering an alternative to inflationary cosmology.

Findings

Homogeneity explained by low entropy at bounce

Flatness arises from contraction and size reduction

Predicts very precise current flatness

Abstract

We address how to construct an infinitely cyclic universe model. A major consideration is to make the entropy cyclic which requires the entropy to be reset to zero in each cycle expansion to turnaround, to contraction, to bounce, etc. Here we reset entropy at the turnaround by selecting the introverse (visible universe) from the extroverse which is generated by the accelerated expansion. In the model, the observed homogeneity is explained by the low entropy at the bounce, The observed flatness arises from the contraction together with the reduction in size between the expanding and contracting universe. The present flatness is predicted to be very precise.