Higher neutrino mass allowed if Cold Dark Matter and Dark Energy are coupled
نویسندگان
چکیده
منابع مشابه
Higher neutrino mass allowed if Cold Dark Matter and Dark Energy are coupled
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 throug...
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Within the frame of cosmologies where Dark Energy (DE) is a self–interacting scalar field, we allow for a CDM–DE coupling and non–zero neutrino masses, simultaneously. In their 0–0 version, i.e. in the absence of coupling and neutrino mass, these cosmologies provide an excellent fit to WMAP, SNIa and deep galaxy sample spectra, at least as good as ΛCDM. When the new degrees of freedom are open,...
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Despite direct observations favoring a low mass density, a critical density universe with a neutrino component of dark matter provides the best existing model to explain the observed structure of the universe over more than three orders of magnitude in distance scale. In principle this hot dark matter could consist of one, two, or three species of active neutrinos. If all present indications fo...
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Cosmological limits on neutrino masses are softened, by more than a factor 2, if Dark Matter and Dark Energy 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–matri...
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ژورنال
عنوان ژورنال: New Astronomy
سال: 2009
ISSN: 1384-1076
DOI: 10.1016/j.newast.2008.12.004