Naturally resonant two-mediator model of self-interacting dark matter with decoupled relic abundance
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| Format: | Preprint |
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2025
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| _version_ | 1866912667322548224 |
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| author | Drobczyk, Martin |
| author_facet | Drobczyk, Martin |
| contents | We propose a minimal, fully thermal mechanism that resolves the long-standing tension between achieving the observed dark-matter relic abundance and explaining the astrophysical signatures of self-interactions. The framework introduces two mediators: a light scalar $ϕ$ (MeV scale) that yields the required, velocity-dependent self-interactions, and a heavy scalar resonance $Φ_h$ (TeV scale) with mass $m_{Φ_h}\!\approx\!2m_χ$ that opens an $s$-channel resonant annihilation during freeze-out. This clearly decouples early-universe annihilation from late-time halo dynamics. A detailed numerical analysis identified a narrow predictive island of viability. A representative benchmark with $m_χ\!=\!600$~GeV, $m_ϕ\!=\!15$~MeV, and $m_{Φ_h}\!\simeq\!1.2$~TeV reproduces the relic density and yields $σ_T/m_χ\sim 0.1$--$1~\mathrm{cm}^2\!/\mathrm{g}$ at dwarf-galaxy velocities while satisfying cluster bounds. The model makes sharp, testable predictions: a narrow $t\bar t$ resonance near $1.2$~TeV within HL-LHC reach, and a spin-independent direct-detection signal $σ_{\rm SI}\!\sim\!7\times10^{-48}\,\mathrm{cm}^2$ within next-generation sensitivity. As an optional UV completion, we show that walking $\mathrm{SU}(3)_H$ gauge theory with $N_f=10$ naturally realizes the near-threshold relation $m_{Φ_h}\!\approx\!2m_χ$ and can furnish an effective anomalous dimension $γ\!\approx\!0.5$ which underlies a density-responsive dark-energy sector, suggesting a unified origin for the dark sector. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2506_22997 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Naturally resonant two-mediator model of self-interacting dark matter with decoupled relic abundance Drobczyk, Martin High Energy Physics - Phenomenology Cosmology and Nongalactic Astrophysics General Relativity and Quantum Cosmology We propose a minimal, fully thermal mechanism that resolves the long-standing tension between achieving the observed dark-matter relic abundance and explaining the astrophysical signatures of self-interactions. The framework introduces two mediators: a light scalar $ϕ$ (MeV scale) that yields the required, velocity-dependent self-interactions, and a heavy scalar resonance $Φ_h$ (TeV scale) with mass $m_{Φ_h}\!\approx\!2m_χ$ that opens an $s$-channel resonant annihilation during freeze-out. This clearly decouples early-universe annihilation from late-time halo dynamics. A detailed numerical analysis identified a narrow predictive island of viability. A representative benchmark with $m_χ\!=\!600$~GeV, $m_ϕ\!=\!15$~MeV, and $m_{Φ_h}\!\simeq\!1.2$~TeV reproduces the relic density and yields $σ_T/m_χ\sim 0.1$--$1~\mathrm{cm}^2\!/\mathrm{g}$ at dwarf-galaxy velocities while satisfying cluster bounds. The model makes sharp, testable predictions: a narrow $t\bar t$ resonance near $1.2$~TeV within HL-LHC reach, and a spin-independent direct-detection signal $σ_{\rm SI}\!\sim\!7\times10^{-48}\,\mathrm{cm}^2$ within next-generation sensitivity. As an optional UV completion, we show that walking $\mathrm{SU}(3)_H$ gauge theory with $N_f=10$ naturally realizes the near-threshold relation $m_{Φ_h}\!\approx\!2m_χ$ and can furnish an effective anomalous dimension $γ\!\approx\!0.5$ which underlies a density-responsive dark-energy sector, suggesting a unified origin for the dark sector. |
| title | Naturally resonant two-mediator model of self-interacting dark matter with decoupled relic abundance |
| topic | High Energy Physics - Phenomenology Cosmology and Nongalactic Astrophysics General Relativity and Quantum Cosmology |
| url | https://arxiv.org/abs/2506.22997 |