Hadronic axion window and the big-bang nucleosynthesis

Details Hadronic axion window and the big-bang nucleosynthesis Hadronic axion window and the big-bang nucleosynthesis

1993-06-03

arxiv.org/abs/hep-ph/9306216v1

Phys.Lett.B316:51-56,1993

Physics

High Energy Physics

High Energy Physics - Phenomenology

14pages

Scientific paper

10.1016/0370-2693(93)90656-3

Hadronic axions with the decay constant $f_a\simeq 10^{6}$ GeV may fulfill all astrophysical and laboratory constraints discussed so far. In this paper, we reexamine the possibility of the hadronic axion window while taking into account the uncertainties of some parameters describing low energy axion dynamics. It is found that $f_a$ in the range from $3\times 10^5$ GeV to $3\times 10^6$ can not be excluded by existing arguments. We then examine the implication of this hadronic axion window for the big-bang nucleosynthesis (NS) by evaluating the energy density of thermal axions at the nucleosynthesis epoch. Our analysis yields $(\rho_a/\rho_{\nu})_{NS}=0.4\sim 0.5$ which exceeds slightly the current best bound $(\rho_a/\rho_{\nu})_{NS}\leq 0.3$.

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