An improved cosmological bound on the thermal axion mass

Details An improved cosmological bound on the thermal axion mass An improved cosmological bound on the thermal axion mass

2007-05-18

arxiv.org/abs/0705.2695v1

Phys.Rev.D76:041303,2007

Astronomy and Astrophysics

Astrophysics

5 Pages, 3 Figures

Scientific paper

10.1103/PhysRevD.76.041303

Relic thermal axions could play the role of an extra hot dark matter component in cosmological structure formation theories. By combining the most recent observational data we improve previous cosmological bounds on the axion mass m_a in the so-called hadronic axion window. We obtain a limit on the axion mass m_a < 0.42eV at the 95% c.l. (m_a < 0.72eV at the 99% c.l.). A novel aspect of the analysis presented here is the inclusion of massive neutrinos and how they may affect the bound on the axion mass. If neutrino masses belong to an inverted hierarchy scheme, for example, the above constraint is improved to m_a < 0.38eV at the 95% c.l. (m_a < 0.67eV at the 99% c.l.). Future data from experiments as CAST will provide a direct test of the cosmological bound.

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