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The MESS of the CMB
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 perturbations in a model independent way, and its implementation requires a minimal modification of...
Autores principales: | , , |
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Lenguaje: | eng |
Publicado: |
2020
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Materias: | |
Acceso en línea: | https://dx.doi.org/10.1088/1475-7516/2021/02/033 http://cds.cern.ch/record/2759156 |
Sumario: | 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 perturbations 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 of 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 perturbations can be an explanation of these deviations. |
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