The KATRIN (Karlsruhe Tritium Neutrino) experiment investigates the kinematic endpoint of the tritium beta-decay spectrum to determine the effective mass of the electron anti-neutrino. The collaboration reported its first limit on the neutrino mass in fall 2019 with mν <1.1 eV (90% CL) followed by the first sub-eV limit in 2022.
Its unprecedented tritium source luminosity and spectroscopic quality make it a unique instru- ment to also search for physics beyond the standard model such as relic or eV-sterile neutrinos. Detector and technologies developed within the KATRIN experiment can also be used for exploring dark matter candidates.
During my talk, the KATRIN experiment and its latest results will be introduced. The other studies of KATRIN regarding sterile and relic neutrinos will be discussed. Finally, the possibility of using the TRISTAN detector to look for dark matter candidates will be mentioned.