4 papers
Dark-pion dark matter beyond leading order: unitarized chiral dynamics
Yuki Watanabe
Dark pions are promising dark matter candidates, yet most analyses rely on leading-order (LO) chiral perturbation theory (ChPT). Motivated by the fact that, even for QCD pi-pi scat…
Unitarization of the Sommerfeld enhancement through the renormalization group
Yuki Watanabe
When a pair of dark matter particles interacts via a long-range force mediated by a light particle, their nonrelativistic annihilation cross section can be significantly enhanced -…
Scalar field stochastic dynamics in de Sitter spacetime from exact solutions of quantum deficient oscillators
Yuta Nasuda, Koki Tokeshi, Yuki Watanabe
The stochastic dynamics of a scalar field in de Sitter spacetime can be regarded as a non-perturbative diffusion process, to which exact distribution and correlation functions are…
Self-Interacting Sub-GeV Dark Matter with Strong MeV Gamma-ray
Yu Watanabe
Sub-GeV dark matter (DM) with -channel resonant self-scattering provides a promising framework for addressing small-scale structure problems. However, models that also account f…