{"record_type":"pith_number_record","schema_url":"https://pith.science/schemas/pith-number/v1.json","pith_number":"pith:2008:ICURDS5FL2CBTA5XKW2OA4QWTM","short_pith_number":"pith:ICURDS5F","schema_version":"1.0","canonical_sha256":"40a911cba55e841983b755b4e072169b1d4bf0fc937ffabd8e13c6060a6fb14a","source":{"kind":"arxiv","id":"0801.0602","version":1},"attestation_state":"computed","paper":{"title":"Alpha-effect dynamos with zero kinetic helicity","license":"","headline":"","cross_cats":[],"primary_cat":"astro-ph","authors_text":"Axel Brandenburg (Nordita), Karl-Heinz R\\\"adler (Potsdam)","submitted_at":"2008-01-03T22:02:42Z","abstract_excerpt":"A simple explicit example of a Roberts-type dynamo is given in which the alpha-effect of mean-field electrodynamics exists in spite of point-wise vanishing kinetic helicity of the fluid flow. In this way it is shown that alpha-effect dynamos do not necessarily require non-zero kinetic helicity. A mean-field theory of Roberts-type dynamos is established within the framework of the second-order correlation approximation. In addition numerical solutions of the original dynamo equations are given, that are independent of any approximation of that kind. Both theory and numerical results demonstrate"},"verification_status":{"content_addressed":true,"pith_receipt":true,"author_attested":false,"weak_author_claims":0,"strong_author_claims":0,"externally_anchored":false,"storage_verified":false,"citation_signatures":0,"replication_records":0,"graph_snapshot":true,"references_resolved":false,"formal_links_present":false},"canonical_record":{"source":{"id":"0801.0602","kind":"arxiv","version":1},"metadata":{"license":"","primary_cat":"astro-ph","submitted_at":"2008-01-03T22:02:42Z","cross_cats_sorted":[],"title_canon_sha256":"1a33fb23e6938736cdf0168064fb500ff195b99b1e531c992f658105e232988f","abstract_canon_sha256":"ac16cc9c79fba2c3248534d8c22fc28f36ca50b853d9ac880d857e4a750b666b"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-04T15:44:37.925850Z","signature_b64":"dUlOt7/WQ0ZwSADbBBZrF3tMfMJXaXPSBK6RZXt7EX6aEnAIgzQgexKjqNfvKYOkVxMFLVrVfFInlT0zaU5HAg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"40a911cba55e841983b755b4e072169b1d4bf0fc937ffabd8e13c6060a6fb14a","last_reissued_at":"2026-07-04T15:44:37.925491Z","signature_status":"signed_v1","first_computed_at":"2026-07-04T15:44:37.925491Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"Alpha-effect dynamos with zero kinetic helicity","license":"","headline":"","cross_cats":[],"primary_cat":"astro-ph","authors_text":"Axel Brandenburg (Nordita), Karl-Heinz R\\\"adler (Potsdam)","submitted_at":"2008-01-03T22:02:42Z","abstract_excerpt":"A simple explicit example of a Roberts-type dynamo is given in which the alpha-effect of mean-field electrodynamics exists in spite of point-wise vanishing kinetic helicity of the fluid flow. In this way it is shown that alpha-effect dynamos do not necessarily require non-zero kinetic helicity. A mean-field theory of Roberts-type dynamos is established within the framework of the second-order correlation approximation. In addition numerical solutions of the original dynamo equations are given, that are independent of any approximation of that kind. Both theory and numerical results demonstrate"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0801.0602","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/0801.0602/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"},"aliases":[{"alias_kind":"arxiv","alias_value":"0801.0602","created_at":"2026-07-04T15:44:37.925551+00:00"},{"alias_kind":"arxiv_version","alias_value":"0801.0602v1","created_at":"2026-07-04T15:44:37.925551+00:00"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.0801.0602","created_at":"2026-07-04T15:44:37.925551+00:00"},{"alias_kind":"pith_short_12","alias_value":"ICURDS5FL2CB","created_at":"2026-07-04T15:44:37.925551+00:00"},{"alias_kind":"pith_short_16","alias_value":"ICURDS5FL2CBTA5X","created_at":"2026-07-04T15:44:37.925551+00:00"},{"alias_kind":"pith_short_8","alias_value":"ICURDS5F","created_at":"2026-07-04T15:44:37.925551+00:00"}],"events":[],"event_summary":{},"paper_claims":[],"inbound_citations":{"count":0,"internal_anchor_count":0,"sample":[]},"formal_canon":{"evidence_count":0,"sample":[],"anchors":[]},"links":{"html":"https://pith.science/pith/ICURDS5FL2CBTA5XKW2OA4QWTM","json":"https://pith.science/pith/ICURDS5FL2CBTA5XKW2OA4QWTM.json","graph_json":"https://pith.science/api/pith-number/ICURDS5FL2CBTA5XKW2OA4QWTM/graph.json","events_json":"https://pith.science/api/pith-number/ICURDS5FL2CBTA5XKW2OA4QWTM/events.json","paper":"https://pith.science/paper/ICURDS5F"},"agent_actions":{"view_html":"https://pith.science/pith/ICURDS5FL2CBTA5XKW2OA4QWTM","download_json":"https://pith.science/pith/ICURDS5FL2CBTA5XKW2OA4QWTM.json","view_paper":"https://pith.science/paper/ICURDS5F","resolve_alias":"https://pith.science/api/pith-number/resolve?arxiv=0801.0602&json=true","fetch_graph":"https://pith.science/api/pith-number/ICURDS5FL2CBTA5XKW2OA4QWTM/graph.json","fetch_events":"https://pith.science/api/pith-number/ICURDS5FL2CBTA5XKW2OA4QWTM/events.json","actions":{"anchor_timestamp":"https://pith.science/pith/ICURDS5FL2CBTA5XKW2OA4QWTM/action/timestamp_anchor","attest_storage":"https://pith.science/pith/ICURDS5FL2CBTA5XKW2OA4QWTM/action/storage_attestation","attest_author":"https://pith.science/pith/ICURDS5FL2CBTA5XKW2OA4QWTM/action/author_attestation","sign_citation":"https://pith.science/pith/ICURDS5FL2CBTA5XKW2OA4QWTM/action/citation_signature","submit_replication":"https://pith.science/pith/ICURDS5FL2CBTA5XKW2OA4QWTM/action/replication_record"}},"created_at":"2026-07-04T15:44:37.925551+00:00","updated_at":"2026-07-04T15:44:37.925551+00:00"}