Nonlinear Quantum Cosmology of de Sitter Space

TL;DR

This paper investigates a nonlinear quantum cosmology model of de Sitter space, revealing a bouncing universe with minimum and maximum sizes, and discusses implications for early and late universe dynamics.

Contribution

It introduces a novel nonlinear Wheeler-deWitt equation approach, transforming it into a difference equation for probability density, and uncovers new features like size bounds not seen in previous studies.

Findings

Discovery of nonzero minimum and maximum universe sizes

Support for bouncing universe scenario

Implications for early universe and future acceleration

Abstract

We perform a minisuperspace analysis of an information-theoretic nonlinear Wheeler-deWitt (WDW) equation for de Sitter universes. The nonlinear WDW equation, which is in the form of a difference-differential equation, is transformed into a pure difference equation for the probability density by using the current conservation constraint. In the present study we observe some new features not seen in our previous approximate investigation, such as a nonzero minimum and maximum allowable size to the quantum universe: An examination of the effective classical dynamics supports the interpretation of a bouncing universe. The studied model suggests implications for the early universe, and plausibly also for the future of an ongoing accelerating phase of the universe.