Author:
Daddi Hammou Aoumeur,Bartolo Nicola
Abstract
Abstract
We study the effect of quantum decoherence on the inflationary cosmological perturbations.
This process might imprint specific observational signatures revealing the quantum nature of the
inflationary mechanism being related to the longstanding issue of the quantum-to-classical
transition of inflationary fluctuations. Several works have investigated the effect of quantum
decoherence on the statistical properties of primordial fluctuations. In particular, it has been
shown that cosmic decoherence leads to corrections to the curvature power spectrum predicted by
standard slow-roll inflation. Equally interesting, a non zero curvature trispectrum has been
shown to be purely induced by cosmic decoherence but, surprisingly, decoherence seems not to
generate any bispectrum. We further develop such an analysis by adopting a generalized form of the
pointer observable, showing that decoherence does induce a non vanishing curvature bispectrum and
providing a specific underlying concrete physical process. Present constraints on primordial
bispectra allow to put an upper bound on the strength of the environment-system interaction. In
full generality, the decoherence-induced bispectrum can be scale dependent provided one imposes
the corresponding correction to the power spectrum to be scale independent. Such scale dependence
on the largest cosmological scales might represent a distinctive imprint of the quantum
decoherence process taking place during inflation. We also provide a criterion that allows to
understand when cosmic decoherence induces scale independent corrections, independently of the
type of environment considered. As a final result, we study the effect of cosmic decoherence on
tensor perturbations and we derive the decoherence corrected tensor-to-scalar perturbation
ratio. In specific cases, decoherence induces a blue tilted correction to the standard tensor
power spectrum.
Subject
Astronomy and Astrophysics
Cited by
4 articles.
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