Work

Freeze-in and freeze-out in a right-handed neutrino extended MSSM with a seesaw mechanism

Year: 2026

Type: article

Abstract: We investigate the possibility of saturating the relic density bound with light Higgsinos. When the minimal supersymmetric Standard Model is extended with right-handed neutrino superfields and the seesaw scale is very low, right-handed sneutrinos can be produced via the freeze-in mechanism. In such a case, we can have essentially two independent sources for dark matter, the traditional freeze-out of Higgsinos and the freeze-in of right-handed sneutrinos. The heavier of these two will decay to the lighter species with a delay. We rule out such a scenario for all seesaw models as the lifetime of sterile neutrinos produced overabundantly via the Dodelson-Widrow mechanism exceeds the age of the Universe and will contribute to the relic density.

Source: Physical review. D/Physical review. D.

DOI: 10.1103/n6nb-klgc

Authors: Tushar Gupta, Matti Heikinheimo, Katri Huitu, Harri Waltari

Institutions: University of Helsinki, Uppsala University

Language: English

Topic: Dark Matter and Cosmic Phenomena

Subfield: Nuclear and High Energy Physics

Field: Physics and Astronomy

Domain: Physical Sciences

Open Access status: hybrid

Funders: Academy of Finland, Carl Tryggers Stiftelse för Vetenskaplig Forskning, Magnus Ehrnroothin Säätiö

Awards: Understanding the Low Energy Excess in Dark Matter Detectors, Exploring new frontiers in dark matter direct detection, G3700453386