Quantum gravity stability of isotropy in homogeneous cosmology
Bogus{\l}aw Broda
TL;DR
This paper investigates how quantum fluctuations influence the stability of isotropy in homogeneous cosmological models, showing damping of anisotropy at one-loop and arguing for stability in the isotropic case beyond one-loop.
Contribution
It demonstrates the damping of anisotropy due to quantum fluctuations and provides a formal argument for isotropy stability beyond one-loop approximation.
Findings
Anisotropy can be damped by quantum fluctuations in one-loop quantum gravity.
A formal argument supports the stability of isotropy beyond one-loop.
Quantum effects may contribute to the isotropization of the universe.
Abstract
It has been shown that anisotropy of homogeneous spacetime described by the general Kasner metric can be damped by quantum fluctuations coming from perturbative quantum gravity in one-loop approximation. Also, a formal argument, not limited to one-loop approximation, is put forward in favor of stability of isotropy in the exactly isotropic case.
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Taxonomy
TopicsNoncommutative and Quantum Gravity Theories · Quantum Electrodynamics and Casimir Effect · Cosmology and Gravitation Theories