{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2011:LZGZ2LJQGTLY4PN25AJFCVZCFY","short_pith_number":"pith:LZGZ2LJQ","canonical_record":{"source":{"id":"1101.1542","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2011-01-07T22:01:09Z","cross_cats_sorted":[],"title_canon_sha256":"9de1894bb86acc69b8403538cd6867caa0eeb9c74e2bb4988d7fb48228d4481d","abstract_canon_sha256":"fbc2d975f5f7dd11461e41bb6cd9a41735fb4ed1b05020b646873c359978aa5f"},"schema_version":"1.0"},"canonical_sha256":"5e4d9d2d3034d78e3dbae8125157222e188ecd0fdcd42316533b3089340f7798","source":{"kind":"arxiv","id":"1101.1542","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1101.1542","created_at":"2026-05-18T04:04:53Z"},{"alias_kind":"arxiv_version","alias_value":"1101.1542v2","created_at":"2026-05-18T04:04:53Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1101.1542","created_at":"2026-05-18T04:04:53Z"},{"alias_kind":"pith_short_12","alias_value":"LZGZ2LJQGTLY","created_at":"2026-05-18T12:26:34Z"},{"alias_kind":"pith_short_16","alias_value":"LZGZ2LJQGTLY4PN2","created_at":"2026-05-18T12:26:34Z"},{"alias_kind":"pith_short_8","alias_value":"LZGZ2LJQ","created_at":"2026-05-18T12:26:34Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2011:LZGZ2LJQGTLY4PN25AJFCVZCFY","target":"record","payload":{"canonical_record":{"source":{"id":"1101.1542","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2011-01-07T22:01:09Z","cross_cats_sorted":[],"title_canon_sha256":"9de1894bb86acc69b8403538cd6867caa0eeb9c74e2bb4988d7fb48228d4481d","abstract_canon_sha256":"fbc2d975f5f7dd11461e41bb6cd9a41735fb4ed1b05020b646873c359978aa5f"},"schema_version":"1.0"},"canonical_sha256":"5e4d9d2d3034d78e3dbae8125157222e188ecd0fdcd42316533b3089340f7798","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T04:04:53.464995Z","signature_b64":"JEuEKPmulLu84Z7oBRVGPZaBQQGuDnCRaieqgcGNQmANYfH6kvtgShw32zeNkXvxr+eohyXtLnxiO4xo6e+KBQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"5e4d9d2d3034d78e3dbae8125157222e188ecd0fdcd42316533b3089340f7798","last_reissued_at":"2026-05-18T04:04:53.464526Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T04:04:53.464526Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1101.1542","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":"2026-05-18T04:04:53Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"GU83qPnpXZ2KxRYJdlzPO/wesEM35vNWWDl6vWFau05Q1deE7Tw5SRZj8tgIqPYG9/R5Hn6q3DAwDvSZpnmpBQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-04T05:29:14.814031Z"},"content_sha256":"7926727013f9dc3989f5852056b2e64c3f514f130daf6bab34f9bc3c6b8fb7d4","schema_version":"1.0","event_id":"sha256:7926727013f9dc3989f5852056b2e64c3f514f130daf6bab34f9bc3c6b8fb7d4"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2011:LZGZ2LJQGTLY4PN25AJFCVZCFY","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Searching for curvature pion radiation from protons in strongly magnetized pulsars","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.HE","authors_text":"Alberto Saa, Douglas Fregolente","submitted_at":"2011-01-07T22:01:09Z","abstract_excerpt":"By using rather conservative estimates based on the simplest polar cap model, we search the ATNF Pulsar Catalogue for strongly magnetized stars that could accelerate relativistic protons up to the curvature pion production threshold. The best candidate turns out to be the 16 ms pulsar J0537-6910, but the corresponding characteristic parameter $\\chi=a/m_p$ is yet too small to give origin to observable signals. We show that, for pulsars with period $P\\approx 1\\,$ms, a surface polar magnetic field $B \\approx 10^{12}$G is required in order to induce detectable curvature pion radiation from acceler"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1101.1542","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":"2026-05-18T04:04:53Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"kgWb8JiCSjH+x1ZP8qgWFLRNnm5tBspZy0nh3oiAf9qMt24Lk8TZor9fWEGyM7jxUkYKjP6z2VYAvCNQEUbPBA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-04T05:29:14.814395Z"},"content_sha256":"cb86c76446d41b82ee07fe1a228193460b22734e530a9aba80fcbdfd911a6cf1","schema_version":"1.0","event_id":"sha256:cb86c76446d41b82ee07fe1a228193460b22734e530a9aba80fcbdfd911a6cf1"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/LZGZ2LJQGTLY4PN25AJFCVZCFY/bundle.json","state_url":"https://pith.science/pith/LZGZ2LJQGTLY4PN25AJFCVZCFY/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/LZGZ2LJQGTLY4PN25AJFCVZCFY/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":"2026-06-04T05:29:14Z","links":{"resolver":"https://pith.science/pith/LZGZ2LJQGTLY4PN25AJFCVZCFY","bundle":"https://pith.science/pith/LZGZ2LJQGTLY4PN25AJFCVZCFY/bundle.json","state":"https://pith.science/pith/LZGZ2LJQGTLY4PN25AJFCVZCFY/state.json","well_known_bundle":"https://pith.science/.well-known/pith/LZGZ2LJQGTLY4PN25AJFCVZCFY/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2011:LZGZ2LJQGTLY4PN25AJFCVZCFY","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":"fbc2d975f5f7dd11461e41bb6cd9a41735fb4ed1b05020b646873c359978aa5f","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2011-01-07T22:01:09Z","title_canon_sha256":"9de1894bb86acc69b8403538cd6867caa0eeb9c74e2bb4988d7fb48228d4481d"},"schema_version":"1.0","source":{"id":"1101.1542","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1101.1542","created_at":"2026-05-18T04:04:53Z"},{"alias_kind":"arxiv_version","alias_value":"1101.1542v2","created_at":"2026-05-18T04:04:53Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1101.1542","created_at":"2026-05-18T04:04:53Z"},{"alias_kind":"pith_short_12","alias_value":"LZGZ2LJQGTLY","created_at":"2026-05-18T12:26:34Z"},{"alias_kind":"pith_short_16","alias_value":"LZGZ2LJQGTLY4PN2","created_at":"2026-05-18T12:26:34Z"},{"alias_kind":"pith_short_8","alias_value":"LZGZ2LJQ","created_at":"2026-05-18T12:26:34Z"}],"graph_snapshots":[{"event_id":"sha256:cb86c76446d41b82ee07fe1a228193460b22734e530a9aba80fcbdfd911a6cf1","target":"graph","created_at":"2026-05-18T04:04:53Z","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":"By using rather conservative estimates based on the simplest polar cap model, we search the ATNF Pulsar Catalogue for strongly magnetized stars that could accelerate relativistic protons up to the curvature pion production threshold. The best candidate turns out to be the 16 ms pulsar J0537-6910, but the corresponding characteristic parameter $\\chi=a/m_p$ is yet too small to give origin to observable signals. We show that, for pulsars with period $P\\approx 1\\,$ms, a surface polar magnetic field $B \\approx 10^{12}$G is required in order to induce detectable curvature pion radiation from acceler","authors_text":"Alberto Saa, Douglas Fregolente","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2011-01-07T22:01:09Z","title":"Searching for curvature pion radiation from protons in strongly magnetized pulsars"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1101.1542","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":"sha256:7926727013f9dc3989f5852056b2e64c3f514f130daf6bab34f9bc3c6b8fb7d4","target":"record","created_at":"2026-05-18T04:04:53Z","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":"fbc2d975f5f7dd11461e41bb6cd9a41735fb4ed1b05020b646873c359978aa5f","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2011-01-07T22:01:09Z","title_canon_sha256":"9de1894bb86acc69b8403538cd6867caa0eeb9c74e2bb4988d7fb48228d4481d"},"schema_version":"1.0","source":{"id":"1101.1542","kind":"arxiv","version":2}},"canonical_sha256":"5e4d9d2d3034d78e3dbae8125157222e188ecd0fdcd42316533b3089340f7798","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"5e4d9d2d3034d78e3dbae8125157222e188ecd0fdcd42316533b3089340f7798","first_computed_at":"2026-05-18T04:04:53.464526Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T04:04:53.464526Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"JEuEKPmulLu84Z7oBRVGPZaBQQGuDnCRaieqgcGNQmANYfH6kvtgShw32zeNkXvxr+eohyXtLnxiO4xo6e+KBQ==","signature_status":"signed_v1","signed_at":"2026-05-18T04:04:53.464995Z","signed_message":"canonical_sha256_bytes"},"source_id":"1101.1542","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:7926727013f9dc3989f5852056b2e64c3f514f130daf6bab34f9bc3c6b8fb7d4","sha256:cb86c76446d41b82ee07fe1a228193460b22734e530a9aba80fcbdfd911a6cf1"],"state_sha256":"fceea221530521db9532dc639536c54fcb918b6bf66cb5005908515475e7a2e5"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"lyxMFkikO7s8oWFR7Xm9NRiD67EfgEak84x700a9WyuKk/CIJsDDjXwfEzrwyir0NshJhSQaWhmweHlvnkXcDg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-04T05:29:14.816347Z","bundle_sha256":"d38c115d0ca50d5f16a9e6c17ef3ce88e3d760cb9d0621923f0a568dff1ebbef"}}