254 citations · 1.8k across the 51 of their papers we have counts for
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Curvaton as dark matter with secondary inflation
Jinn-Ouk Gong, Naoya Kitajima, Takahiro Terada
We consider a novel cosmological scenario in which a curvaton is long-lived and plays the role of cold dark matter (CDM) in the presence of a short, secondary inflation. Non-trivia…
Topological Defects and nano-Hz Gravitational Waves in Aligned Axion Models
Tetsutaro Higaki, Kwang Sik Jeong, Naoya Kitajima +2
We study the formation and evolution of topological defects in an aligned axion model with multiple Peccei-Quinn scalars, where the QCD axion is realized by a certain combination o…
Quality of the Peccei-Quinn symmetry in the Aligned QCD Axion and Cosmological Implications
Tetsutaro Higaki, Kwang Sik Jeong, Naoya Kitajima +1
We show that the required high quality of the Peccei-Quinn symmetry can be naturally explained in the aligned QCD axion models where the QCD axion arises from multiple axions with…
The QCD Axion from Aligned Axions and Diphoton Excess
Tetsutaro Higaki, Kwang Sik Jeong, Naoya Kitajima +1
We argue that the QCD axion can arise from many aligned axions with decay constants much smaller than the conventional axion window. If the typical decay constant is of {\cal O}{(1…