Juntaro Wada

collaborators

5 papers

hep-ph2026

Hydrodynamics of Filtered Dark Matter: A Two-Component Approach

Juntaro Wada

We study the hydrodynamics of the Filtered Dark Matter (Filtered DM) scenario during a first-order phase transition (FOPT). In this scenario, the bubble wall is highly reflective o…

hep-ph2026

Gravitational Decays of Secluded Scalars and Graviton Dark Radiation

Kazunori Nakayama, Fuminobu Takahashi, Juntaro Wada

We discuss graviton dark radiation produced by the decay of a secluded scalar field that couples to the Standard Model (SM) only through gravity. Such scalar fields are long-lived,…

hep-ph2026

Asymmetric Dark Matter from Low-Scale Spontaneous Leptogenesis

Hiroki Takahashi, Juntaro Wada

We investigate a novel type of asymmetric dark matter (ADM) model in which the dark matter asymmetry and the baryon asymmetry in our universe (BAU) are produced simultaneously via…

hep-ph2024

Majoron-Driven Leptogenesis in Gauged $U (1)_{L_{I^} ¼ - L_{I ¨} }$ Model

Juntaro Wada

We propose a novel leptogenesis scenario in the gauged $U (1)_{L_{I^} ¼ - L_{I ¨} }$ model. Achieving successful leptogenesis in the $U (1)_{L_{I^} ¼ - L_{I ¨} }$ symmetric phase is challenging due to t…

hep-ph2024

Gauge coupling jump and small instantons from a large non-minimal coupling

Juntaro Wada, Wen Yin

If a scalar field couples to the Ricci scalar with a large non-minimal coupling, the Standard Model coupling parameters can differ above and below an intermediate field range of th…

Hydrodynamics of Filtered Dark Matter: A Two-Component Approach

Gravitational Decays of Secluded Scalars and Graviton Dark Radiation

Asymmetric Dark Matter from Low-Scale Spontaneous Leptogenesis

Majoron-Driven Leptogenesis in Gauged U(1)LI^​¼−LI¨​​ Model

Gauge coupling jump and small instantons from a large non-minimal coupling

Majoron-Driven Leptogenesis in Gauged $U (1)_{L_{I^} ¼ - L_{I ¨} }$ Model