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Cosmological constraints on neutrino plus axion hot dark matter: Update after WMAP-5

Steen Hannestad, Alessandro Mirizzi, Georg G. Raffelt, Yvonne Y. Y. Wong

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.).

Cosmological constraints on neutrino plus axion hot dark matter: Update after WMAP-5

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.).

Paper Structure

This paper contains 2 sections, 3 equations, 1 figure.

Table of Contents

  1. Acknowledgements
  2. References

Figures (1)

  • Figure 1: 2D marginal 68% and 95% contours in the $\sum m_\nu$-$m_a$ plane derived from the standard data set of our previous paper (excluding Lyman-$\alpha$ forest). The blue/solid lines correspond to our new results using WMAP-5, while the red/dashed lines are our previous constraints derived from WMAP-3.