Cosmological constraints on neutrino plus axion hot dark matter: Update after WMAP-5
Hannestad, Steen and Mirizzi, Alessandro and Raffelt, Georg G. and Wong, Yvonne Y. Y.
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Abstract
We update our previous constraints on two-component hot dark matter (axions and neutrinos), including the recent WMAP 5-year data release. Marginalising over sum m_nu provides m_a < 1.02 eV (95% C.L.) for the axion mass. In the absence of axions we find sum m_nu < 0.63 eV (95% C.L.).
