Enlightening the CSL model landscape in inflation

Abstract

We propose a novel realization for the natural extrapolation of the continuous spontaneous localization (CSL) model, in order to account for the origin of primordial inhomogeneities during inflation. This particular model is based on three main elements: (i) the semiclassical gravity framework, (ii) a collapse-generating operator associated to a relativistic invariant scalar of the energy-momentum tensor, and (iii) an extension of the CSL parameter(s) as a function of the spacetime curvature. Furthermore, employing standard cosmological perturbation theory at linear order, and for a reasonable range within the parameter space of the model, we obtain a nearly scale invariant power spectrum consistent with recent observational CMB data. This opens a vast landscape of different options for the application of the CSL model to the cosmological context, and possibly sheds light on searches for a full covariant version of the CSL theory.

arXiv comment18 pages, 2 Appendices. Improved version, accepted in EPJC

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• Reconstruction of inflationary scenarios in non-conservative unimodular gravity
• Emergent universe: tensor perturbations within the CSL framework
• Emergent universe revisited through the CSL theory
• Revisiting astrophysical bounds on continuous spontaneous localization models
• Observational constraints on the second-order primordial power spectrum: Exploring a Continuous Spontaneous Localization inspired inflationary model
• Constraining tachyonic inflationary β-exponential model with Continuous Spontaneous Localization collapse scheme