![]() We also discussed the axion misalignment for the axion production. An axion is a hypothetical elementary particle postulated by the PecceiQuinn theory in 1977 to resolve the strong CP problem in quantum chromodynamics. Also, if the inflaton decayed at a late time after the decay of the saxion, the axion relic density could have not saturated the observed dark matter relic density, without disturbing the structure formation due to relativistic axions. The recently reported X-ray line signal at \(E_\gamma \simeq 3.5~\mathrm\) \(X\)-ray line signal consistently. ![]()
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