{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:1998:X4H3R263QLELY4XSQV34QSJS4G","merge_version":"pith-open-graph-merge-v1","event_count":2,"valid_event_count":2,"invalid_event_count":0,"equivocation_count":0,"current":{"canonical_record":{"metadata":{"abstract_canon_sha256":"ac757f13908b0bf83753f6a9d57c0d3c5110073c33a987480e71f6ed61f85c6b","cross_cats_sorted":["hep-ph"],"license":"","primary_cat":"astro-ph","submitted_at":"1998-11-02T01:50:30Z","title_canon_sha256":"7eb08760a7d980defcb1407bc312525cff179835361e1e2df201ef119a0ab76b"},"schema_version":"1.0","source":{"id":"astro-ph/9811011","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"astro-ph/9811011","created_at":"2026-05-18T02:40:34Z"},{"alias_kind":"arxiv_version","alias_value":"astro-ph/9811011v2","created_at":"2026-05-18T02:40:34Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.astro-ph/9811011","created_at":"2026-05-18T02:40:34Z"},{"alias_kind":"pith_short_12","alias_value":"X4H3R263QLEL","created_at":"2026-05-18T12:25:49Z"},{"alias_kind":"pith_short_16","alias_value":"X4H3R263QLELY4XS","created_at":"2026-05-18T12:25:49Z"},{"alias_kind":"pith_short_8","alias_value":"X4H3R263","created_at":"2026-05-18T12:25:49Z"}],"graph_snapshots":[{"event_id":"sha256:f4367760131849f783ea1a717d19d2dae737b6f667c9f981eb0c00463c74cf5d","target":"graph","created_at":"2026-05-18T02:40:34Z","signer":{"key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signer_id":"pith.science","signer_type":"pith_registry"},"payload":{"graph_snapshot":{"author_claims":{"count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","strong_count":0},"builder_version":"pith-number-builder-2026-05-17-v1","claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"paper":{"abstract_excerpt":"Cosmic ray particles with energies in excess of 10**(20) eV have been detected. The sources as well as the physical mechanism(s) responsible for endowing cosmic ray particles with such enormous energies are unknown. This report gives a review of the physics and astrophysics associated with the questions of origin and propagation of these Extremely High Energy (EHE) cosmic rays in the Universe. After a brief review of the observed cosmic rays in general and their possible sources and acceleration mechanisms, a detailed discussion is given of possible \"top-down\" (non-acceleration) scenarios of o","authors_text":"Guenter Sigl (Univ. of Chicago, Pijushpani Bhattacharjee (Indian Astrophysics Institute), USA)","cross_cats":["hep-ph"],"headline":"","license":"","primary_cat":"astro-ph","submitted_at":"1998-11-02T01:50:30Z","title":"Origin and Propagation of Extremely High Energy Cosmic Rays"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"astro-ph/9811011","kind":"arxiv","version":2},"verdict":{"created_at":null,"id":null,"model_set":{},"one_line_summary":"","pipeline_version":null,"pith_extraction_headline":"","strongest_claim":"","weakest_assumption":""}},"verdict_id":null}}],"author_attestations":[],"timestamp_anchors":[],"storage_attestations":[],"citation_signatures":[],"replication_records":[],"corrections":[],"mirror_hints":[],"record_created":{"event_id":"sha256:591a9a5d75699b8db93c64fc32efdd0a9a7dd066b32954212ac3e001b97dfadd","target":"record","created_at":"2026-05-18T02:40:34Z","signer":{"key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signer_id":"pith.science","signer_type":"pith_registry"},"payload":{"attestation_state":"computed","canonical_record":{"metadata":{"abstract_canon_sha256":"ac757f13908b0bf83753f6a9d57c0d3c5110073c33a987480e71f6ed61f85c6b","cross_cats_sorted":["hep-ph"],"license":"","primary_cat":"astro-ph","submitted_at":"1998-11-02T01:50:30Z","title_canon_sha256":"7eb08760a7d980defcb1407bc312525cff179835361e1e2df201ef119a0ab76b"},"schema_version":"1.0","source":{"id":"astro-ph/9811011","kind":"arxiv","version":2}},"canonical_sha256":"bf0fb8ebdb82c8bc72f28577c84932e1abe6d0726f833ee26e9c08aeb1513cf6","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"bf0fb8ebdb82c8bc72f28577c84932e1abe6d0726f833ee26e9c08aeb1513cf6","first_computed_at":"2026-05-18T02:40:34.897957Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T02:40:34.897957Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"xr8SMgB9Bm42o+xXOSZVTUut47BBjZfhlU5/aP9P7C2ZQmIuqrXgSw0ScEThDpvh+EF8lVpDSLJB/MWAMfsLCQ==","signature_status":"signed_v1","signed_at":"2026-05-18T02:40:34.898604Z","signed_message":"canonical_sha256_bytes"},"source_id":"astro-ph/9811011","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:591a9a5d75699b8db93c64fc32efdd0a9a7dd066b32954212ac3e001b97dfadd","sha256:f4367760131849f783ea1a717d19d2dae737b6f667c9f981eb0c00463c74cf5d"],"state_sha256":"cadb0124087f4f7bb145540187b91709f166cc7ef1eaa7f72d4b32dbe874fd9c"}