What the study found
The study presents a minimal asymmetric dark matter model in which the dark sector contains a stable neutral Dirac fermion X and a real scalar mediator ϕ, with the mediator coupled to the Standard Model through a Higgs portal. The authors say that if dark and baryonic asymmetries are of comparable size, the dark matter mass is naturally near the GeV scale.
Why the authors say this matters
The authors conclude that the model provides a phenomenological benchmark for how dark matter may arise as a cold, stable, massive counterpart to visible matter with a shared cosmological origin. They also note that the framework is motivated by the observed ratio ΩDM/Ωb ≃ 5.4.
What the researchers tested
The researchers introduced an explicit effective asymmetry-transfer operator, formulated a Boltzmann description for the symmetric and asymmetric components, and discussed the role of the scalar mediator in reducing the symmetric relic population. They also commented on Higgs-portal phenomenology and benchmark parameter ranges consistent with the minimal framework.
What worked and what didn't
The model includes a conserved dark number carried by X and a scalar mediator ϕ that can couple the dark sector to the Standard Model. The authors discuss the scalar mediator as a way to deplete the symmetric relic population, and they state that the benchmark ranges are consistent with the minimal framework. The abstract does not report detailed numerical performance comparisons or specific failures.
What to keep in mind
The authors state that the model is intended as a phenomenological benchmark rather than a complete ultraviolet completion. The abstract does not give detailed limitations beyond that scope statement.
Key points
- The model contains a stable neutral Dirac fermion X and a real scalar mediator ϕ.
- The scalar mediator couples to the Standard Model through a Higgs portal.
- Comparable dark and baryonic asymmetries imply a dark matter mass near the GeV scale.
- An effective asymmetry-transfer operator and Boltzmann equations are used to describe symmetric and asymmetric components.
- The authors present the framework as a phenomenological benchmark, not a complete ultraviolet completion.
Disclosure
- Research title:
- Minimal asymmetric dark matter model uses Higgs-portal mediation
- Authors:
- Thys, Albert Jean H Thys
- Institutions:
- University of Michigan
- Publication date:
- 2026-04-20
- OpenAlex record:
- View
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