Higher neutrino mass allowed if Cold Dark Matter and Dark Energy are coupled

Abstract

Cosmological limits on neutrino masses are softened, by more than a factor 2, if Cold Dark Matter (CDM) and Dark Energy (DE) are coupled. In turn, a neutrino mass yielding ${\Omega }_{\nu }$ up to $\sim 0.20$ allows coupling levels $\beta \simeq 0.15,$ or more, already easing the coincidence problem. The coupling, in fact, displaces both $P(k)$ and $C_l$ spectra in a fashion opposite to neutrino mass. Estimates are obtained through a Fisher--matrix technique.

22 pages, 9 figures. Added appendix and references, corrected typos. Version to appear in New Astronomy

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