Holographic Entanglement Entropy in Cyclic Cosmology

TL;DR

This paper explores how holographic entanglement entropy can be used to model a cyclic universe, proposing that entropy considerations allow for a universe that undergoes infinite cycles by disconnecting spacetime regions.

Contribution

It introduces a novel approach using entanglement entropy to explain cyclic cosmology and the conditions for universe turnaround and disconnection.

Findings

Entanglement entropy of the introverse is key to cyclic behavior.

Zero entanglement entropy at turnaround allows disconnecting the extroverse.

Proposes a mechanism for infinite cyclic cosmology based on entropy dynamics.

Abstract

We discuss a cyclic cosmology in which the visible universe, or introverse, is all that is accessible to an observer while the extroverse represents the total spacetime originating from the time when the dark energy began to dominate. It is argued that entanglement entropy of the introverse is the more appropriate quantity to render infinitely cyclic, rather than the entropy of the total universe. Since vanishing entanglement entropy implies disconnected spacetimes, at the turnaround when the introverse entropy is zero the disconnected extroverse can be jettisoned with impunity.