{"paper":{"title":"SAETASS: Solver for Astroparticle Equation of Transport Analysis in Spherical Symmetry","license":"http://creativecommons.org/licenses/by-nc-nd/4.0/","headline":"SAETASS solves the time-dependent transport equation for astroparticles in spherical symmetry with a conservative finite-volume method.","cross_cats":["astro-ph.IM"],"primary_cat":"astro-ph.HE","authors_text":"Jos\\'e Mar\\'ia Garc\\'ia-Morillo, Rub\\'en L\\'opez-Coto, Stefano Menchiari","submitted_at":"2026-04-20T18:03:07Z","abstract_excerpt":"In order to model astrophysical environments characterized by radial stratification, such as supernova remnants or expanding superbubbles; correctly understanding the transport of non-thermal particles in astrophysical plasmas is essential. While large-scale Galactic propagation codes exist, they are often optimized for Cartesian or cylindrical geometries and lack the efficiency of one-dimensional spherically symmetric problems. In this work, we present SAETASS (Solver for Astroparticle Equation of Transport Analysis in Spherical Symmetry), a novel, open-source numerical tool designed to solve"},"claims":{"count":4,"items":[{"kind":"strongest_claim","text":"Our results successfully recover established steady-state limits while revealing relevant pre-equilibrium temporal dynamics across Kolmogorov, Kraichnan and Bohm diffusion regimes.","source":"verdict.strongest_claim","status":"machine_extracted","claim_id":"C1","attestation":"unclaimed"},{"kind":"weakest_assumption","text":"The modular operator-splitting architecture accurately manages the interplay between advection, diffusion, and losses without introducing significant numerical artifacts in combined solutions.","source":"verdict.weakest_assumption","status":"machine_extracted","claim_id":"C2","attestation":"unclaimed"},{"kind":"one_line_summary","text":"SAETASS is a new open-source code that solves the astroparticle transport equation in spherical symmetry using finite-volume methods and modular operator splitting, validated on test cases and applied to cosmic-ray protons.","source":"verdict.one_line_summary","status":"machine_extracted","claim_id":"C3","attestation":"unclaimed"},{"kind":"headline","text":"SAETASS solves the time-dependent transport equation for astroparticles in spherical symmetry with a conservative finite-volume method.","source":"verdict.pith_extraction.headline","status":"machine_extracted","claim_id":"C4","attestation":"unclaimed"}],"snapshot_sha256":"1d94400a8c1e8559011850c59f640aa5da538a0aa51f131724165b61bbe94e4b"},"source":{"id":"2604.18703","kind":"arxiv","version":2},"verdict":{"id":"1f3ae94d-119b-443c-9364-9a13ec64c817","model_set":{"reader":"grok-4.3"},"created_at":"2026-05-10T03:32:08.299101Z","strongest_claim":"Our results successfully recover established steady-state limits while revealing relevant pre-equilibrium temporal dynamics across Kolmogorov, Kraichnan and Bohm diffusion regimes.","one_line_summary":"SAETASS is a new open-source code that solves the astroparticle transport equation in spherical symmetry using finite-volume methods and modular operator splitting, validated on test cases and applied to cosmic-ray protons.","pipeline_version":"pith-pipeline@v0.9.0","weakest_assumption":"The modular operator-splitting architecture accurately manages the interplay between advection, diffusion, and losses without introducing significant numerical artifacts in combined solutions.","pith_extraction_headline":"SAETASS solves the time-dependent transport equation for astroparticles in spherical symmetry with a conservative finite-volume method."},"integrity":{"clean":false,"summary":{"advisory":0,"critical":1,"by_detector":{"doi_compliance":{"total":1,"advisory":0,"critical":1,"informational":0}},"informational":0},"endpoint":"/pith/2604.18703/integrity.json","findings":[{"note":"Identifier '10.1007/978-3-540-49834-6' is syntactically valid but the DOI registry (doi.org) returned 404, and Crossref / OpenAlex / internal corpus also have no record. The cited work could not be located through any authoritative source.","detector":"doi_compliance","severity":"critical","ref_index":25,"audited_at":"2026-05-20T03:47:40.933805Z","detected_doi":"10.1007/978-3-540-49834-6","finding_type":"unresolvable_identifier","verdict_class":"cross_source","detected_arxiv_id":null}],"available":true,"detectors_run":[{"name":"doi_compliance","ran_at":"2026-05-20T03:47:40.933805Z","status":"completed","version":"1.0.0","findings_count":1}],"snapshot_sha256":"19f56fa19524af0c4686a84953d6cbf6668dfcfec9afbd8745a27a49b0752425"},"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"}