27 citations · 39 across the 2 of their papers we have counts for
2 papers
astro-ph.CO2020★ 12 cited
Can axion clumps be formed in a pre-inflationary scenario?
Hayato Fukunaga, Naoya Kitajima, Yuko Urakawa
The QCD axion and an axion-like particle (ALP) are compelling candidates of dark matter. For the QCD axion, it is known that when the Peccei-Quinn (PQ) symmetry is spontaneously br…
astro-ph.CO2019★ 27 cited
Efficient self-resonance instability from axions
Hayato Fukunaga, Naoya Kitajima, Yuko Urakawa
It was recently shown that a coherent oscillation of an axion can cause an efficient parametric resonance, leading to a prominent emission of the gravitational waves (GWs). In this…