![]() ![]() Small misalignment angles of the axion, ranging between – depending on the reheating temperature, can also be the source of axion production. Nonetheless, the saxion decay is an interesting possibility, because the line and dark radiation can be addressed simultaneously, being consistent with the Planck data. If the axions were produced from the saxion decay, it could not have constituted the total relic density due to the bound from structure formation. We show that the right amount of axion relic density with the preferred parameters, and, can be naturally obtainable from the decay of inflaton. A light axion-like scalar is suggested as a natural candidate for dark matter and its production mechanisms are closely examined. The recently reported X-ray line signal at from a stacked spectrum of various galaxy clusters and the Andromeda galaxy may be originating from a decaying dark matter particle of the mass. School of Physics, KIAS, Seoul, 130-722, Korea Hyun Min Lee 1, Seong Chan Park 2 and Wan-Il Park 3 *ĭepartment of Physics, Chung-Ang University, Seoul, 156-756, Koreaĭepartment of Physics, Sungkyunkwan University, Suwon, 440-746, Korea ![]()
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