{"paper":{"title":"Linear Ricci-Trace Deformations and Operational Equivalence in Rastall-Type Gravity","license":"http://creativecommons.org/licenses/by/4.0/","headline":"","cross_cats":["astro-ph.CO"],"primary_cat":"gr-qc","authors_text":"Jos\\'e A. C. Nogales, Karen-Luz Burgoa Rosso, Marcelo H. Alavarenga","submitted_at":"2026-06-08T17:56:43Z","abstract_excerpt":"We analyze a class of linear Ricci--trace deformations of Einstein's field equations in which the relative weight between the Ricci tensor and the scalar-curvature trace sector is modified while the metric remains the only gravitational field. The purpose of the analysis is structural rather than phenomenological: we classify the corresponding field-equation class, fix the parameter dictionaries commonly used in the Rastall-gravity literature, and identify which equivalence statements survive after Newtonian calibration. We show that two frequently used parametrizations, \\[ (1-\\epsilon)R_{\\mu\\"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2606.09819","kind":"arxiv","version":1},"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/2606.09819/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"}