{"paper":{"title":"A New Robust Constraint on the Self-interaction Cross-section of Dark Matter with Double Radio Relic Clusters","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"Merging galaxy clusters with double radio relics constrain dark matter self-interactions to sigma/m below 0.22 cm²/g.","cross_cats":["astro-ph.HE","gr-qc","hep-ex","hep-th"],"primary_cat":"astro-ph.CO","authors_text":"Dongak Park, M. James Jee, Wonki Lee","submitted_at":"2026-04-30T18:00:02Z","abstract_excerpt":"Merging galaxy clusters are a promising laboratory for measuring the self-interaction cross-section (SICS) of dark matter. However, previous studies have focused on galaxy-mass offsets, which numerical simulations have shown to be intrinsically small because galaxies remain tightly coupled to the dominant dark matter potential even with significant self-interaction. Their interpretation is further complicated by unknowns of the merger phase, geometry, and initial conditions. In this paper, we overcome these obstacles by introducing the shock-to-shock distance, traced by double radio relics, as"},"claims":{"count":4,"items":[{"kind":"strongest_claim","text":"Applying this method to a gold sample of eleven cluster mergers hosting symmetric double radio relics, we determine a 68% upper limit on the SICS of sigma/m < 0.22 cm^2/g. This is the first constraint from cluster collisions that fully marginalizes over mass uncertainty, viewing angle, collision speed, merger phase, impact parameter, and gas profile slope.","source":"verdict.strongest_claim","status":"machine_extracted","claim_id":"C1","attestation":"unclaimed"},{"kind":"weakest_assumption","text":"The propagation speed of merger shocks is nearly independent of the SICS, while the halo-to-halo distance is depressed by SIDM-induced drag, so that their ratio directly translates into a constraint on sigma/m; this assumption is stated in the abstract but its validity depends on unexamined simulation calibrations and merger modeling details.","source":"verdict.weakest_assumption","status":"machine_extracted","claim_id":"C2","attestation":"unclaimed"},{"kind":"one_line_summary","text":"Shock-to-shock distances in double radio relic clusters serve as a merger chronometer to set a 68% upper limit of sigma/m < 0.22 cm²/g on dark matter self-interaction, marginalizing over mass, angle, speed, phase, impact parameter, and gas slope.","source":"verdict.one_line_summary","status":"machine_extracted","claim_id":"C3","attestation":"unclaimed"},{"kind":"headline","text":"Merging galaxy clusters with double radio relics constrain dark matter self-interactions to sigma/m below 0.22 cm²/g.","source":"verdict.pith_extraction.headline","status":"machine_extracted","claim_id":"C4","attestation":"unclaimed"}],"snapshot_sha256":"27855e305d41a29651eb0d8fb282223e8cf6276b5a5de88269fdaeebb7473a3d"},"source":{"id":"2605.00093","kind":"arxiv","version":2},"verdict":{"id":"1651ae6c-70ba-49f4-b5e4-063d544f18c3","model_set":{"reader":"grok-4.3"},"created_at":"2026-05-09T20:46:41.630154Z","strongest_claim":"Applying this method to a gold sample of eleven cluster mergers hosting symmetric double radio relics, we determine a 68% upper limit on the SICS of sigma/m < 0.22 cm^2/g. This is the first constraint from cluster collisions that fully marginalizes over mass uncertainty, viewing angle, collision speed, merger phase, impact parameter, and gas profile slope.","one_line_summary":"Shock-to-shock distances in double radio relic clusters serve as a merger chronometer to set a 68% upper limit of sigma/m < 0.22 cm²/g on dark matter self-interaction, marginalizing over mass, angle, speed, phase, impact parameter, and gas slope.","pipeline_version":"pith-pipeline@v0.9.0","weakest_assumption":"The propagation speed of merger shocks is nearly independent of the SICS, while the halo-to-halo distance is depressed by SIDM-induced drag, so that their ratio directly translates into a constraint on sigma/m; this assumption is stated in the abstract but its validity depends on unexamined simulation calibrations and merger modeling details.","pith_extraction_headline":"Merging galaxy clusters with double radio relics constrain dark matter self-interactions to sigma/m below 0.22 cm²/g."},"integrity":{"clean":false,"summary":{"advisory":0,"critical":4,"by_detector":{"doi_compliance":{"total":4,"advisory":0,"critical":4,"informational":0}},"informational":0},"endpoint":"/pith/2605.00093/integrity.json","findings":[{"note":"Identifier '10.3847/1538-4357/ac294d' is syntactically valid but the DOI registry (doi.org) returned 404, and Crossref / OpenAlex / internal corpus also have no record. 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