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. © 2008 Elsevier B.V. All rights reserved.
LA VACCA, G., Bonometto, S., Colombo, L. (2009). Higher neutrino mass allowed if Cold Dark Matter and Dark Energy are coupled. NEW ASTRONOMY, 14(5), 435-442 [10.1016/j.newast.2008.12.004].
Higher neutrino mass allowed if Cold Dark Matter and Dark Energy are coupled
LA VACCA, GIUSEPPEPrimo
;BONOMETTO, SILVIO;
2009
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 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. © 2008 Elsevier B.V. All rights reserved.
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