Relaxing cosmological constraints on current neutrino masses

We show that a mass-varying neutrino model driven by scalar field dark energy relaxes the existing upper bound on the current neutrino mass to \({\sum m_\nu < 0.72}\) eV. We extend the standard \(\Lambda\) cold dark matter model by introducing two parameters: the rate of change of the scalar fiel...

Full description

Saved in:
Bibliographic Details
Published inarXiv.org
Main Authors Vitor da Fonseca, Barreiro, Tiago, Nunes, Nelson J
Format Paper Journal Article
LanguageEnglish
Published Ithaca Cornell University Library, arXiv.org 15.04.2024
Subjects
Cosmological constant
Couplings
Dark energy
Neutrinos
Physics - Cosmology and Nongalactic Astrophysics
Physics - High Energy Physics - Phenomenology
Scalars
Upper bounds
Online AccessGet full text

Cover

More Information
Summary:We show that a mass-varying neutrino model driven by scalar field dark energy relaxes the existing upper bound on the current neutrino mass to \({\sum m_\nu < 0.72}\) eV. We extend the standard \(\Lambda\) cold dark matter model by introducing two parameters: the rate of change of the scalar field with the number of \(e\)-folds and the coupling between neutrinos and the field. We investigate how they affect the matter power spectrum, the cosmic microwave background anisotropies and its lensing potential. The model is tested against Planck observations of temperature, polarization, and lensing, combined with baryon acoustic oscillation measurements that constrain the background evolution. The results indicate that small couplings favor a cosmological constant, while larger couplings favor a dynamical dark energy, weakening the upper bound on current neutrino masses.
ISSN:2331-8422
DOI:10.48550/arxiv.2311.01803