Semiclassical geometrodynamics of homogeneous cosmology

• URL: http://arxiv.org/abs/2210.07458v2
• Date: Thu, 22 Feb 2024 16:30:58 GMT
• Title: Semiclassical geometrodynamics of homogeneous cosmology
• Authors: Viqar Husain, Muhammad Muzammil
• Abstract summary: We study the classical-quantum hybrid dynamics of homogeneous cosmology from a Hamiltonian perspective. Our results indicate that full backreaction effects leave traces at late times in cosmological evolution.
• Score: 0.0
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: We study the classical-quantum (CQ) hybrid dynamics of homogeneous cosmology from a Hamiltonian perspective where the classical gravitational phase space variables and matter state evolve self-consistently with full backreaction. We compare numerically the classical and CQ dynamics for isotropic and anisotropic models, including quantum scalar-field induced corrections to the Kasner exponents. Our results indicate that full backreaction effects leave traces at late times in cosmological evolution; in particular, the scalar energy density at late times provides a potential contribution to dark energy. We also show that the CQ equations admit exact static solutions for the isotropic, and the anisotropic Bianchi IX universes with the scalar field in a stationary state.

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