Quantum Mixmaster as a model of the Primordial Universe

TL;DR

This paper explores the quantum version of the Mixmaster model to understand early universe dynamics, highlighting features like singularity resolution, bouncing, and inflation through various quantization methods and semi-classical approaches.

Contribution

It introduces a quantum Mixmaster model using affine and Weyl-Heisenberg covariant quantizations, providing new insights into early universe phenomena and potential cosmological scenarios.

Findings

Singularity resolution and smooth bouncing observed.

Post-bounce inflation and anisotropic oscillations identified.

Numerical integration benefits from semi-classical approach with exact anisotropy potential.

Abstract

The Mixmaster solution to Einstein field equations was examined by C. Misner in an effort to better understand the dynamics of the early universe. We highlight the importance of the quantum version of this model for early universe. This quantum version and its semi-classical portraits are yielded through affine and standard coherent state quantizations and more generally affine and Weyl-Heisenberg covariant integral quantizations. The adiabatic and vibronic approximations widely used in molecular physics can be employed to qualitatively study the dynamics of the model on both quantum and semi-classical levels. Moreover, the semi-classical approach with the exact anisotropy potential can be effective in numerical integration of some solutions. Some promising physical features such as the singularity resolution, smooth bouncing, the excitation of anisotropic oscillations and a substantial amount of post-bounce inflation as the backreaction to the latter are pointed out. Finally, a realistic cosmological scenario based on the quantum mixmaster model, which includes the formation and evolution of local structures is outlined.