Oral comunication
V. da Fonseca, T. Barreiro, N. J. Nunes
Abstract
The standard model of cosmology predicts that the Universe is filled with a background of thermal relic neutrinos, known
as the cosmic neutrino background (C$
u$B). The C$
u$B has not yet been detected, but experiments on flavor
oscillations set a constraint on the minimum neutrino mass that establishes a lower limit on its energy density. Conversely,
the strongest upper limit is given by measurements of the cosmic microwave background (CMB). In this study, we examine
the possibility of relaxing the cosmological limit on neutrino mass by exploring its potential interaction with a scalar field of
dark energy. In a scenario where the neutrino mass varies, we introduce two parameters to account for the field's evolution
and the coupling strength between the two sectors. We test the model using Planck observations that include the lensing
potential as a probe of large-scale structure, alongside BAO detection that constrain the background evolution. Our findings
indicate that the upper limit on the neutrino mass can be relaxed to ${sum m_
u < 0.72}$ eV.
18th Iberian Cosmology Meeting (IberiCOS2024)
Salamanca, Spain
2024 March
