Cosmological constraints on neutrino plus axion hot dark matter: Update after WMAP-5
Steen Hannestad, Alessandro Mirizzi, Georg G. Raffelt, Yvonne Y. Y., Wong
TL;DR
This paper updates constraints on hot dark matter components, axions and neutrinos, using recent WMAP-5 data, providing tighter bounds on their masses and exploring their cosmological implications.
Contribution
It offers the latest cosmological bounds on axion and neutrino masses incorporating WMAP-5 data, refining previous limits and analyzing their combined effects.
Findings
Axion mass m_a < 1.02 eV at 95% C.L.
Sum of neutrino masses < 0.63 eV at 95% C.L.
Updated constraints improve previous bounds.
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.).
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