339 citations · 2.8k across the 32 of their papers we have counts for
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hep-ph2018★ 36 cited
Enhanced photon coupling of ALP dark matter adiabatically converted from the QCD axion
Shu-Yu Ho, Ken'ichi Saikawa, Fuminobu Takahashi
We revisit the adiabatic conversion between the QCD axion and axion-like particle (ALP) at level crossing, which can occur in the early universe as a result of the existence of a h…
hep-ph2018★ 257 cited
Primordial gravitational waves, precisely: The role of thermodynamics in the Standard Model
Ken'ichi Saikawa, Satoshi Shirai
In this paper, we revisit the estimation of the spectrum of primordial gravitational waves originated from inflation, particularly focusing on the effect of thermodynamics in the S…