A Minimal Model For Two-Component FIMP Dark Matter: A Basic Search

Abstract

In the multi-component configurations of dark matter phenomenology, we propose a minimal two-component configuration which is an extension of the Standard Model with only three new fields; one scalar and one fermion interact with the thermal soup through Higgs portal, mediated by the other scalar in such a way that the stabilities of dark matter candidates are made simultaneously by an explicit $Z_2$ symmetry. Against the most common freeze-out framework, we look for dark matter particle signatures in the freeze-in scenario by evaluating the relic density and detection signals. A simple distinguishing feature of the model is the lack of dark matter conversion, so the dark matter components act individually and the model can be adapted entirely to both singlet scalar and singlet fermionic models, separately. We find dark matter self-interaction as the most promising approach to probe such feeble models. Although the scalar component satisfies this constraint, the fermionic one refuses it even in the resonant region.

30 pages, 4 igures

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• Electroweak phase transition and gravitational waves in a two-component dark matter model
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• Feebly coupled vector boson dark matter in effective theory
• Gravitational wave effects and phenomenology of a two-component dark matter model
• Electroweak Symmetry Breaking and WIMP-FIMP Dark Matter
• Freeze-in and Freeze-out of Dark Matter with Charged Long-lived Partners
• Gravitational wave signatures of first-order phase transition in two-component dark matter model
• Scale-Invariant Two Component Dark Matter
• Spin Trio: a dark matter scenario
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• Velocity-dependent self-interacting dark matter from thermal freeze-out and tests in direct detections
• Searching for Vector-Like Quarks in a Fermionic Dark Matter Model with Pseudoscalar: A Resonance Case