Karlsruhe 2024 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 110: Search for Dark Matter 5

T 110.1: Vortrag

Freitag, 8. März 2024, 09:00–09:15, Geb. 30.22: Gaede-HS

Boosting the production of sterile neutrino dark matter with self-interactions — •Maria Dias and Stefan Vogl — Institute of Physics, University of Freiburg, Herrmann-Herder-Str. 3, 79104 Freiburg, Germany

Sterile neutrinos are well-motivated and simple dark matter (DM) candidates. However, sterile neutrino DM produced through oscillations by the Dodelson-Widrow mechanism is excluded by current X-ray observations and bounds from structure formation. One minimal extension, that preserves the attractive features of this scenario, is self-interactions among sterile neutrinos. In this work, we analyze how sterile neutrino self-interactions mediated by a scalar affect the production of keV sterile neutrinos for a wide range of mediator masses. We find four distinct regimes of production characterized by different phenomena, including partial thermalization for low and intermediate masses and resonant production for heavier mediators. We show that significant new regions of parameter space become available which provide a target for future observations.

Keywords: Sterile neutrinos; Dark matter; Self-interactions