{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2010:4UWNDJ36YN3WWGNQW3XWNFOKAH","short_pith_number":"pith:4UWNDJ36","canonical_record":{"source":{"id":"1007.0039","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"hep-ph","submitted_at":"2010-06-30T22:12:55Z","cross_cats_sorted":["astro-ph.HE","nucl-ex","nucl-th"],"title_canon_sha256":"dd8d45adcc10a482e6ea158dcb739eda02e5a73f31d889330f5eacbbd74c4d6c","abstract_canon_sha256":"e29e9f671ff5e19d18dbc894fdeac9b45eecb2bc149f711878fc785f2faadc0c"},"schema_version":"1.0"},"canonical_sha256":"e52cd1a77ec3776b19b0b6ef6695ca01c86c2efb73bb270174f9b8c3a92bafa7","source":{"kind":"arxiv","id":"1007.0039","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1007.0039","created_at":"2026-05-18T04:38:39Z"},{"alias_kind":"arxiv_version","alias_value":"1007.0039v2","created_at":"2026-05-18T04:38:39Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1007.0039","created_at":"2026-05-18T04:38:39Z"},{"alias_kind":"pith_short_12","alias_value":"4UWNDJ36YN3W","created_at":"2026-05-18T12:26:04Z"},{"alias_kind":"pith_short_16","alias_value":"4UWNDJ36YN3WWGNQ","created_at":"2026-05-18T12:26:04Z"},{"alias_kind":"pith_short_8","alias_value":"4UWNDJ36","created_at":"2026-05-18T12:26:04Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2010:4UWNDJ36YN3WWGNQW3XWNFOKAH","target":"record","payload":{"canonical_record":{"source":{"id":"1007.0039","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"hep-ph","submitted_at":"2010-06-30T22:12:55Z","cross_cats_sorted":["astro-ph.HE","nucl-ex","nucl-th"],"title_canon_sha256":"dd8d45adcc10a482e6ea158dcb739eda02e5a73f31d889330f5eacbbd74c4d6c","abstract_canon_sha256":"e29e9f671ff5e19d18dbc894fdeac9b45eecb2bc149f711878fc785f2faadc0c"},"schema_version":"1.0"},"canonical_sha256":"e52cd1a77ec3776b19b0b6ef6695ca01c86c2efb73bb270174f9b8c3a92bafa7","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T04:38:39.941347Z","signature_b64":"I8HZa6WyjilrQrjetvqQXrnIlikiZ/z5PN2LAIwmVWxRthu1/CErb5V8AkD4nbzQ0ltR4WaLXso48oym6xdBCA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"e52cd1a77ec3776b19b0b6ef6695ca01c86c2efb73bb270174f9b8c3a92bafa7","last_reissued_at":"2026-05-18T04:38:39.940738Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T04:38:39.940738Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1007.0039","source_version":2,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T04:38:39Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"5WmgbTKYy0Hz7yEff4MYhU7X+9/bsygxnHa1gx+rnDfYijsW374ALSKIXf9AcQm3FiwGJH0ZYHBdHPs37zTFAA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-31T06:34:39.828755Z"},"content_sha256":"31a2cd1f70fb7c4433d2dc67b7fecd7b29be7501884b79e0628cc8474b4e9718","schema_version":"1.0","event_id":"sha256:31a2cd1f70fb7c4433d2dc67b7fecd7b29be7501884b79e0628cc8474b4e9718"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2010:4UWNDJ36YN3WWGNQW3XWNFOKAH","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Electron and Photon Interactions in the Regime of Strong LPM Suppression","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.HE","nucl-ex","nucl-th"],"primary_cat":"hep-ph","authors_text":"Lisa Gerhardt, Spencer R. Klein","submitted_at":"2010-06-30T22:12:55Z","abstract_excerpt":"Most searches for ultra-high energy (UHE) astrophysical neutrinos look for radio emission from the electromagnetic and hadronic showers produced in their interactions. The radio frequency spectrum and angular distribution depend on the shower development, so are sensitive to the interaction cross sections. At energies above about 10^{16} eV (in ice), the Landau-Pomeranchuk-Migdal (LPM) effect significantly reduces the cross sections for the two dominant electromagnetic interactions: bremsstrahlung and pair production. At higher energies, above about 10^{20} eV, the photonuclear cross section b"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1007.0039","kind":"arxiv","version":2},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"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"},"verdict_id":null},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T04:38:39Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"VQIb+e8iii2pQgelaFniIplqllRi3BC8jdTmAIWw5rwdx+HQBSwhB8L+SoQ5yVkeQ46mK7i3d3pnD/2RW7hEBw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-31T06:34:39.829197Z"},"content_sha256":"b33a69f63f249a1193a5e7c929a3479d8f7258ba0624752cecf3d3069470bb2e","schema_version":"1.0","event_id":"sha256:b33a69f63f249a1193a5e7c929a3479d8f7258ba0624752cecf3d3069470bb2e"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/4UWNDJ36YN3WWGNQW3XWNFOKAH/bundle.json","state_url":"https://pith.science/pith/4UWNDJ36YN3WWGNQW3XWNFOKAH/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/4UWNDJ36YN3WWGNQW3XWNFOKAH/bundle.json","status":"primary"}],"public_keys":[{"key_id":"pith-v1-2026-05","algorithm":"ed25519","format":"raw","public_key_b64":"stVStoiQhXFxp4s2pdzPNoqVNBMojDU/fJ2db5S3CbM=","public_key_hex":"b2d552b68890857171a78b36a5dccf368a953413288c353f7c9d9d6f94b709b3","fingerprint_sha256_b32_first128bits":"RVFV5Z2OI2J3ZUO7ERDEBCYNKS","fingerprint_sha256_hex":"8d4b5ee74e4693bcd1df2446408b0d54","rotates_at":null,"url":"https://pith.science/pith-signing-key.json","notes":"Pith uses this Ed25519 key to sign canonical record SHA-256 digests. Verify with: ed25519_verify(public_key, message=canonical_sha256_bytes, signature=base64decode(signature_b64))."}],"merge_version":"pith-open-graph-merge-v1","built_at":"2026-05-31T06:34:39Z","links":{"resolver":"https://pith.science/pith/4UWNDJ36YN3WWGNQW3XWNFOKAH","bundle":"https://pith.science/pith/4UWNDJ36YN3WWGNQW3XWNFOKAH/bundle.json","state":"https://pith.science/pith/4UWNDJ36YN3WWGNQW3XWNFOKAH/state.json","well_known_bundle":"https://pith.science/.well-known/pith/4UWNDJ36YN3WWGNQW3XWNFOKAH/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2010:4UWNDJ36YN3WWGNQW3XWNFOKAH","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":"e29e9f671ff5e19d18dbc894fdeac9b45eecb2bc149f711878fc785f2faadc0c","cross_cats_sorted":["astro-ph.HE","nucl-ex","nucl-th"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"hep-ph","submitted_at":"2010-06-30T22:12:55Z","title_canon_sha256":"dd8d45adcc10a482e6ea158dcb739eda02e5a73f31d889330f5eacbbd74c4d6c"},"schema_version":"1.0","source":{"id":"1007.0039","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1007.0039","created_at":"2026-05-18T04:38:39Z"},{"alias_kind":"arxiv_version","alias_value":"1007.0039v2","created_at":"2026-05-18T04:38:39Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1007.0039","created_at":"2026-05-18T04:38:39Z"},{"alias_kind":"pith_short_12","alias_value":"4UWNDJ36YN3W","created_at":"2026-05-18T12:26:04Z"},{"alias_kind":"pith_short_16","alias_value":"4UWNDJ36YN3WWGNQ","created_at":"2026-05-18T12:26:04Z"},{"alias_kind":"pith_short_8","alias_value":"4UWNDJ36","created_at":"2026-05-18T12:26:04Z"}],"graph_snapshots":[{"event_id":"sha256:b33a69f63f249a1193a5e7c929a3479d8f7258ba0624752cecf3d3069470bb2e","target":"graph","created_at":"2026-05-18T04:38:39Z","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":"Most searches for ultra-high energy (UHE) astrophysical neutrinos look for radio emission from the electromagnetic and hadronic showers produced in their interactions. The radio frequency spectrum and angular distribution depend on the shower development, so are sensitive to the interaction cross sections. At energies above about 10^{16} eV (in ice), the Landau-Pomeranchuk-Migdal (LPM) effect significantly reduces the cross sections for the two dominant electromagnetic interactions: bremsstrahlung and pair production. At higher energies, above about 10^{20} eV, the photonuclear cross section b","authors_text":"Lisa Gerhardt, Spencer R. Klein","cross_cats":["astro-ph.HE","nucl-ex","nucl-th"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"hep-ph","submitted_at":"2010-06-30T22:12:55Z","title":"Electron and Photon Interactions in the Regime of Strong LPM Suppression"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1007.0039","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":"sha256:31a2cd1f70fb7c4433d2dc67b7fecd7b29be7501884b79e0628cc8474b4e9718","target":"record","created_at":"2026-05-18T04:38:39Z","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":"e29e9f671ff5e19d18dbc894fdeac9b45eecb2bc149f711878fc785f2faadc0c","cross_cats_sorted":["astro-ph.HE","nucl-ex","nucl-th"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"hep-ph","submitted_at":"2010-06-30T22:12:55Z","title_canon_sha256":"dd8d45adcc10a482e6ea158dcb739eda02e5a73f31d889330f5eacbbd74c4d6c"},"schema_version":"1.0","source":{"id":"1007.0039","kind":"arxiv","version":2}},"canonical_sha256":"e52cd1a77ec3776b19b0b6ef6695ca01c86c2efb73bb270174f9b8c3a92bafa7","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"e52cd1a77ec3776b19b0b6ef6695ca01c86c2efb73bb270174f9b8c3a92bafa7","first_computed_at":"2026-05-18T04:38:39.940738Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T04:38:39.940738Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"I8HZa6WyjilrQrjetvqQXrnIlikiZ/z5PN2LAIwmVWxRthu1/CErb5V8AkD4nbzQ0ltR4WaLXso48oym6xdBCA==","signature_status":"signed_v1","signed_at":"2026-05-18T04:38:39.941347Z","signed_message":"canonical_sha256_bytes"},"source_id":"1007.0039","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:31a2cd1f70fb7c4433d2dc67b7fecd7b29be7501884b79e0628cc8474b4e9718","sha256:b33a69f63f249a1193a5e7c929a3479d8f7258ba0624752cecf3d3069470bb2e"],"state_sha256":"f265c919bab04b6e596b7a521b6241c943e81c6742134fcf74059355a6b7e01b"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"s12a1N8Rw6/lFMwmKLJNAcbDSpENn+OLrdBk/GFmkl0EDoccld5olxVrRohyxG7LDt7oIaym3yzc8y56oTwBCg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-31T06:34:39.831597Z","bundle_sha256":"1d9957973a5436ee31c79068ede236fd9a3d5d7110a02da3b7dfe247b6257b79"}}