Semiclassical Cosmological Perturbations Generated during Inflation
Albert Roura, Enric Verdaguer
TL;DR
This paper investigates how quantum matter fluctuations during inflation induce stochastic gravitational perturbations, using the Einstein-Langevin equation to understand their role in large-scale structure formation.
Contribution
It applies the Einstein-Langevin framework to analyze the generation of gravitational fluctuations during inflation, highlighting the stochastic effects of quantum matter fields.
Findings
Quantum stress-energy fluctuations induce stochastic spacetime geometry.
Gravitational fluctuations during inflation impact large-scale structure formation.
The Einstein-Langevin equation effectively models back-reaction effects in semiclassical gravity.
Abstract
Environment interaction may induce stochastic semiclassical dynamics in open quantum systems. In the gravitational context, stress-energy fluctuations of quantum matter fields give rise to a stochastic behaviour in the spacetime geometry. Einstein-Langevin equation is a suitable tool to take these effects into account when addressing the back-reaction problem in semiclassical gravity. We analyze within this framework the generation of gravitational fluctuations during inflation, which are of great interest for large-scale structure formation in cosmology.
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