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 Ων up to ∼0.20 allows coupling levels β≃0.15, or more, already easing the coincidence problem. The coupling, in fact, displaces both P(k) and Cl spectra in a fashion opposite to neutrino mass. Estimates are obtained through a Fisher--matrix technique.
@article{arxiv.0810.0127,
title = {Higher neutrino mass allowed if Cold Dark Matter and Dark Energy are coupled},
author = {G. La Vacca and S. A. Bonometto and L. P. L. Colombo},
journal= {arXiv preprint arXiv:0810.0127},
year = {2010}
}
Comments
22 pages, 9 figures. Added appendix and references, corrected typos. Version to appear in New Astronomy