Precision cosmology and 7Li data

TL;DR

This paper discusses how 7Li abundance data provide additional constraints on cosmological parameters, influencing dark energy models and neutrino mass limits beyond traditional methods like CMB and supernova observations.

Contribution

It highlights the significance of 7Li data in cosmology, showing its impact on parameter estimation and dark energy models, which has been largely overlooked.

Findings

7Li data favor smaller baryon density values

7Li constraints suggest dark energy could be in the phantom regime

7Li data soften the upper neutrino mass limit to ~1.6 eV

Abstract

At variance from 2H, 3He and 4He abundances, 7Li abundance data yield an extra constraint to cosmological parameters, in top of those deriving from CMB, BAO, SNIa or H0 data. This constraint, often disregarded, would favor smaller $\Omega_b h^2$ values, also indicating a preference for Dark Energy state equations well in the phantom regime, simultaneously softening the upper limit on the sum of neutrino masses, up to ~1.6eV.