Mixmaster chaos in a quantum scenario:a Deformed Algebra approach

TL;DR

This paper investigates how quantum deformations of algebraic relations affect chaos in the Mixmaster cosmological model, finding that chaos is suppressed and dynamics become more regular.

Contribution

It introduces a Deformed Algebra approach to quantum Mixmaster models, analyzing chaos suppression via modified Poisson brackets inspired by quantum gravity theories.

Findings

Chaos is removed in the quantum-deformed Mixmaster model.

Dynamics tend to settle into oscillations or reach singularity without chaos.

Deformation sign influences whether the system oscillates or simplifies.

Abstract

In this work, we address the question about the fate of chaos in the Mixmaster model when we promote the system at a quantum level. We consider Deformed Commutation Relations for the Misner anisotropic variables, whose Deformed Algebras are related to two different Quantum Gravity approaches, i.e. Loop Quantum Gravity and String Theory. Also, this approach naturally implements a form of Non-Commutativity between the space variables, i.e. the anisotropies, that live in a two-dimensional space. In particular, we consider the deformation in the semiclassical limit, where the Deformed Commutators become Deformed Poisson Brackets. Then, we derive the modified Belinskii-Khalatnikov-Lifshitz map in both cases, whose properties determine the chaotic behavior for the dynamics at a classical level. The result is that chaos is removed in both cases. In fact, depending on the sign of the deformation, the dynamics will either settle into oscillations between two almost-constant angles, or stop reflecting after a finite number of iterations and reach the singularity as one last simple Kasner solution.