Conveners
Parallel session 3
- Shohei Okawa (YITP, Kyoto University)
We derive the oscillation formula of Majorana neutrinos based on quantum field theory. Since the Hamiltonian under the Majorana mass term does not conserve lepton number, the eigenstates of lepton number change complexly over time. With the Bogoliubov transformation, we successfully relate the lepton number eigenstates at different times. This method enables us to understand the time evolution...
We investigate a neutrino-scalar dark matter (DM) $\nu\phi$ interaction encountering distinctive neutrino sources, namely Diffuse Supernova Neutrino Background (DSNB) and Active Galactic Nuclei (AGN). The interaction is mediated by a fermionic particle $F$ , in which the $\nu\phi$ scattering cross section characterizes different energy dependent with respect to the kinematic regions, and...
In this talk, I will discuss future solar neutrino observatories and their role in measuring solar neutrino oscillation parameters. These observatories will also contribute to determining the structure of the Sun and the Earth through the study of day-night asymmetry. Solar neutrinos, produced via the pp-chain and CNO cycle, travel directly from the solar core to the Earth. Detecting these...
Dark matter (DM) is one of the main components of the universe and strongly related to the evolution of the universe. In order to understand the nature of DM, numerous direct and indirect search experiments are on-going or planned. The Intermediate Water Cherenkov Detector (IWCD), a near detector planned for Hyper-Kamiokande, is equipped with a vertically movable capability that enables the...
Axions provide a compelling solution to the strong CP problem and a viable candidate for dark matter. We explore their realization in a minimal five-dimensional $M_4 \times S^1/\mathbb{Z}_2$ orbifold framework. An explicit one-loop Casimir energy calculation reveals that the irreducible axion potential induced by worldline instantons is exponentially suppressed, thereby ensuring a high-quality...
