254 citations · 9.7k across the 219 of their papers we have counts for
220 papers
Environment-Dependent Annihilation of Axion-Coupled Higgsino Dark Matter
Kwang Sik Jeong, Fuminobu Takahashi
We study environment-dependent annihilation of quasi-Dirac Higgsino dark matter coupled to an axion-like particle with a mass slightly below the Higgsino-pair threshold. Axion-medi…
Nelson-Barr Inflation
Fuminobu Takahashi
The Nelson-Barr mechanism solves the strong CP problem through spontaneous CP violation, but the resulting CP-conjugate vacua generically lead to stable domain walls. We propose th…
QCD Axion Hybrid Inflation
Yuma Narita, Fuminobu Takahashi, Wen Yin
When the inflaton is coupled to the gluon Chern-Simons term for successful reheating, mixing between the inflaton and the QCD axion is generally expected given the solution of the…
Can baryon asymmetry be explained by a large initial value before inflation?
Kai Murai, Fuminobu Takahashi, Masaki Yamada +1
We show that the baryon asymmetry of the Universe cannot be explained by a large initial value before inflation because it inevitably predicts correlated baryon isocurvature pertur…
Quantum decay of scalar and vector boson stars and oscillons into gravitons
Kazunori Nakayama, Fuminobu Takahashi, Masaki Yamada
We point out that a soliton such as an oscillon or boson star inevitably decays into gravitons through gravitational interactions. These decay processes exist even if there are no…
Gravitational Waves from Domain Wall Collapse, and Application to Nanohertz Signals with QCD-coupled Axions
Naoya Kitajima, Junseok Lee, Kai Murai +2
We study for the first time the gravitational waves generated during the collapse of domain walls, incorporating the potential bias in the lattice simulations. The final stages of…