{"paper":{"title":"Mixed Freeze-In and Freeze-Out Histories and Dark-Sector Decays in a $\\mathbb{Z}_4$ Two-Scalar Model","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["hep-th"],"primary_cat":"hep-ph","authors_text":"B. A. Couto e Silva, B. L. S\\'anchez-Vega, J. P. Carvalho-Corr\\^ea","submitted_at":"2026-02-20T19:01:38Z","abstract_excerpt":"We present a systematic non-equilibrium analysis of a renormalisable $\\mathbb{Z}_4$ Higgs-portal dark sector with a complex scalar $S_A$ and a real scalar $S_B$, including conversion, semi-annihilation, and, when kinematically allowed, the dark-sector decay $S_B\\to S_A S_A$. We impose theoretical consistency, Higgs invisible-decay limits, relic-fraction-rescaled LZ bounds, and an a posteriori thermalisation check of the WIMP/FIMP assignments. Allowing one or both dark states to remain out of equilibrium qualitatively enlarges the set of viable cosmological histories. In the stable regime, FIMP"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2602.18564","kind":"arxiv","version":2},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/2602.18564/integrity.json","findings":[],"available":true,"detectors_run":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938"},"references":{"count":0,"sample":[],"resolved_work":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","internal_anchors":0},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"author_claims":{"count":0,"strong_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"builder_version":"pith-number-builder-2026-05-17-v1"}