Solar Capture and Suppressed Annihilation of Inelastic Scalar Dark Matter
Abstract
Solar capture of inelastic dark matter does not by itself fix the annihilation signal. We consider a scalar low-energy model with a B−3Lτ current, motivated by the high-energy recoil candidate reported by LUX-ZEPLIN. For mχ=840 GeV, a 320 keV splitting, and a 160 MeV mediator, the public LZ response gives 0.965 expected accepted events, while micrOMEGAs gives Ωh2=0.11999834. Finite-momentum nuclear responses leave iron as an important solar-capture target despite the near cancellation of its coherent charge at zero momentum transfer. The captured population remains extended after thermal nuclear motion, elastic and inelastic scattering, and excited-state decay are included, with reff=0.215R⊙. Same-state annihilation is open, but the inferred rate is only 0.0404 of the public IceCube W+W--calibrated proxy and is smaller than the corresponding isothermal estimate by a factor of 628. For this benchmark, substantial solar capture is accompanied by a weak neutrino signal.
Related
- Solar capture and annihilation of fermionic and scalar dark matter motivated by the LUX-ZEPLIN high-recoil candidate
- Mixing-suppressed inelastic dark matter: a minimal model for the LZ 248 keV event
- Solar Neutrino Signals and Capture-Annihilation Equilibrium of SU(5) Neutralino Dark Matter
- Inelastic B−L scalar dark matter and the LUX-ZEPLIN event
- Implications of Inelastic Dark Matter for Primordial Dark-Star Evolution: Kinematic Thresholds and Nonthermal Capture
BibTeX
@misc{qi2026solar,
title = {{Solar Capture and Suppressed Annihilation of Inelastic Scalar Dark Matter}},
author = {XinXin Qi and Hao Sun},
howpublished = {arXiv},
year = {2026},
month = oct,
doi = {10.48550/arxiv.2609.10636},
eprint = {2609.10636},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2609.10636},
note = {CC BY 4.0},
}
RIS
TY - UNPB
TI - Solar Capture and Suppressed Annihilation of Inelastic Scalar Dark Matter
AU - XinXin Qi
AU - Hao Sun
PY - 2026
DA - 2026/10/07
PB - arXiv
DO - 10.48550/arxiv.2609.10636
UR - https://arxiv.org/abs/2609.10636
AB - Solar capture of inelastic dark matter does not by itself fix the annihilation signal. We consider a scalar low-energy model with a B−3L_τ current, motivated by the high-energy recoil candidate reported by LUX-ZEPLIN. For m_χ=840 GeV, a 320 keV splitting, and a 160 MeV mediator, the public LZ response gives 0.965 expected accepted events, while micrOMEGAs gives Ωh^2=0.11999834. Finite-momentum nuclear responses leave iron as an important solar-capture target despite the near cancellation of its coherent charge at zero momentum transfer. The captured population remains extended after thermal nuclear motion, elastic and inelastic scattering, and excited-state decay are included, with r_eff=0.215R_⊙. Same-state annihilation is open, but the inferred rate is only 0.0404 of the public IceCube W^+W^--calibrated proxy and is smaller than the corresponding isothermal estimate by a factor of 628. For this benchmark, substantial solar capture is accompanied by a weak neutrino signal.
ER -