Quasi-matter bounce and inflation in the light of the CSL model

TL;DR

This paper explores how the CSL model influences primordial spectra predictions in early Universe models, showing compatibility with Planck data for certain parameters, thus linking quantum collapse mechanisms with cosmological observations.

Contribution

It applies the CSL model to matter bounce and inflation scenarios, providing new predictions for primordial spectra and their consistency with observational data.

Findings

CSL parameters can produce spectra consistent with Planck data

Predictions include amplitude, spectral index, and tensor-to-scalar ratio

The model offers a quantum-to-classical transition mechanism in cosmology

Abstract

The Continuous Spontaneous Localization (CSL) model has been proposed as a possible solution to the quantum measurement problem by modifying the Schr\"{o}dinger equation. In this work, we apply the CSL model to two cosmological models of the early Universe: the matter bounce scenario and slow roll inflation. In particular, we focus on the generation of the classical primordial inhomogeneities and anisotropies that arise from the dynamical evolution, provided by the CSL mechanism, of the quantum state associated to the quantum fields. In each case, we obtained a prediction for the shape and the parameters characterizing the primordial spectra (scalar and tensor), i.e. the amplitude, the spectral index and the tensor-to-scalar ratio. We found that there exist CSL parameter values, allowed by other non-cosmological experiments, for which our predictions for the angular power spectrum of the CMB temperature anisotropy are consistent with the best fit canonical model to the latest data released by the Planck Collaboration.