The MESS of the CMB
Abstract
We analyze cosmic microwave background (CMB) data taking into account the effects of a momentum dependent effective sound speed (MESS). This approach allows to study the effects of primordial entropy in a model independent way, and its implementation requires a minimal modification of existing CMB fitting numerical codes developed for single scalar field models. We adopt a phenomenological approach, and study the effects a local variation of the MESS around the scale where other analysis have shown some deviation from an approximately scale invariant curvature perturbation spectrum. We obtain a substantial improvement of the fit with respect to a model without MESS, showing that primordial entropy modeled by MESS can be an explanation of these deviations.
Keywords
Cite
@article{arxiv.2006.03395,
title = {The MESS of the CMB},
author = {Manuel Alejandro Jaramillo Rodrguez and Antonio Enea Romano and Sergio Andres Vallejo-Pena},
journal= {arXiv preprint arXiv:2006.03395},
year = {2021}
}
Comments
15 pages, 5 figures