Observational constraints on neutrino masses in rolling tachyon field model
Department Of Physics, Lorestan University, Khramabad, Iran
Accepted: 1 May 2023
Published online: 23 May 2023
In the standard model of particles physics, neutrinos have no mass. In this model, there are three massless neutrino species that only interact through the weak force. Neutrinos can leave imprint in several cosmological data sets. Cosmological data provide an independent and powerful tool to tackle the absolute scale of neutrino and to study its properties. The observational measurements taken by the Planck satellite provide extremely tight upper bounds on the total neutrino mass scale confidence level (CL)). In this paper, the constraints on the total neutrino mass and extra relativistic degrees of freedom in a rolling tachyon model, with steep runaway type of potentials non-minimally coupled to massive neutrino matter, are investigated. The observational data include the type Ia supernovae (SN) observation (Pantheon compilation and Union2 data), CC and combination of CMB + CC + Pantheon data that are used in this work. For CMB + CC + Pantheon data, we have found that the neutrino mass is closely constrained to confidence level (CL)) which is in good agreement with the 2018 Planck results where the limit of the total neutrino mass is CL TT, TE, EE + lowE + Lensing [CamSpec]), and we also find CL which is in good agreement with the results of Planck with CL TE, TT, EE, LowE + lensing + BAO + R18). In order to reconstruct the history of the universe, we reconstruct the deceleration parameter q(z) based on the best fitted parameters of the model. The evolution of the model shows that the universe start from radiation dominated epoch continues toward matter-dominated epoch at deceleration–acceleration transition enters the acceleration phase and with current value and moves toward stable dark energy dominated. The obtained values of and are in good agreement with observations.
© The Author(s), under exclusive licence to Società Italiana di Fisica and Springer-Verlag GmbH Germany, part of Springer Nature 2023. Springer Nature or its licensor (e.g. a society or other partner) holds exclusive rights to this article under a publishing agreement with the author(s) or other rightsholder(s); author self-archiving of the accepted manuscript version of this article is solely governed by the terms of such publishing agreement and applicable law.