Quantum state evolution in an environment of cosmological perturbations

Abstract

We study the pure and thermal states of quantized scalar and tensor perturbations in various epochs of Universe evolution. We calculate the density matrix of non-relativistic particles in an environment of these perturbations. We show that particle's motion can be described by a stochastic equation with a noise coming from the cosmological environment. We investigate the squeezing of Gaussian wave packets in different epochs and its impact upon the noise of quantized cosmological perturbations.

34 pages

References in corpus (4)

• Unified cosmic history in modified gravity: from F(R) theory to Lorentz non-invariant models
• The cosmological gravitational wave background from primordial density perturbations
• Aspects of Graviton Detection: Graviton Emission and Absorption by Atomic Hydrogen
• Renormalization in quantum Brans-Dicke gravity