Generalising axion-like particle as the curvaton: sourcing primordial density perturbation and non-Gaussianities by Anish Ghoshal, Abhishek Naskar

“…The results of our analysis in the limit $$m_u = m_d$$ m u = m d resembles vanilla curvaton scenario while in the limit $$m_u \gg m_d$$ m u ≫ m d resembles pure axion cosine potential. …”
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