{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2018:5NPC5SZTVUUVKXU7EYYXBNJVA7","short_pith_number":"pith:5NPC5SZT","canonical_record":{"source":{"id":"1805.01372","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.class-ph","submitted_at":"2018-05-01T19:14:49Z","cross_cats_sorted":["gr-qc"],"title_canon_sha256":"fc2955b20e87b6f8859167a7dc53708c7b7720e5916f17a1939e6a242946d555","abstract_canon_sha256":"fe746b5992d5ca8c0d969252be249a02befae2a2c16e275ec492a7377e76994f"},"schema_version":"1.0"},"canonical_sha256":"eb5e2ecb33ad29555e9f263170b53507e4c0361d324a003d1896589a2231cdce","source":{"kind":"arxiv","id":"1805.01372","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1805.01372","created_at":"2026-05-18T00:02:03Z"},{"alias_kind":"arxiv_version","alias_value":"1805.01372v2","created_at":"2026-05-18T00:02:03Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1805.01372","created_at":"2026-05-18T00:02:03Z"},{"alias_kind":"pith_short_12","alias_value":"5NPC5SZTVUUV","created_at":"2026-05-18T12:32:08Z"},{"alias_kind":"pith_short_16","alias_value":"5NPC5SZTVUUVKXU7","created_at":"2026-05-18T12:32:08Z"},{"alias_kind":"pith_short_8","alias_value":"5NPC5SZT","created_at":"2026-05-18T12:32:08Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2018:5NPC5SZTVUUVKXU7EYYXBNJVA7","target":"record","payload":{"canonical_record":{"source":{"id":"1805.01372","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.class-ph","submitted_at":"2018-05-01T19:14:49Z","cross_cats_sorted":["gr-qc"],"title_canon_sha256":"fc2955b20e87b6f8859167a7dc53708c7b7720e5916f17a1939e6a242946d555","abstract_canon_sha256":"fe746b5992d5ca8c0d969252be249a02befae2a2c16e275ec492a7377e76994f"},"schema_version":"1.0"},"canonical_sha256":"eb5e2ecb33ad29555e9f263170b53507e4c0361d324a003d1896589a2231cdce","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T00:02:03.183469Z","signature_b64":"OS/wcga4aCcesQ6NZ6VnWDnJiNuDyiFQriDv099cN+z6lUhEbRpikv7HXEL8FOKWeFTsyctIvSJt7TxKSLjmCQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"eb5e2ecb33ad29555e9f263170b53507e4c0361d324a003d1896589a2231cdce","last_reissued_at":"2026-05-18T00:02:03.182747Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T00:02:03.182747Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1805.01372","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":"2026-05-18T00:02:03Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"sEgd96ySH9p2+7rGfqeyYdgIso4VVnfx41HAKV4T0lyznAR676AYFH1NYCH1u+O75BY1yQCwhaFgWSQMaqGOCg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-29T15:37:15.160281Z"},"content_sha256":"9190540370e198f769de1239fa05afce4de17a507a2e1f054497a692fe7e4acf","schema_version":"1.0","event_id":"sha256:9190540370e198f769de1239fa05afce4de17a507a2e1f054497a692fe7e4acf"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2018:5NPC5SZTVUUVKXU7EYYXBNJVA7","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Self-torque and angular momentum balance for a spinning charged sphere","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["gr-qc"],"primary_cat":"physics.class-ph","authors_text":"Beatrice Bonga, Eric Poisson, Huan Yang","submitted_at":"2018-05-01T19:14:49Z","abstract_excerpt":"Angular momentum balance is examined in the context of the electrodynamics of a spinning charged sphere, which is allowed to possess any variable angular velocity. We calculate the electric and magnetic fields of the (hollow) sphere, and express them as expansions in powers of $\\tau/t_c \\ll 1$, the ratio of the light-travel time $\\tau$ across the sphere and the characteristic time scale $t_c$ of variation of the angular velocity. From the fields we compute the self-torque exerted by the fields on the sphere, and argue that only a piece of this self-torque can be associated with radiation react"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1805.01372","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":"2026-05-18T00:02:03Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"6oAVPYaxFbv4kHDIPVheWWtXglrc4bHdgdpjYLFVSiOC+hY4KAfrSecbNJTcp5MUWIPvhv6lQbDoj/7sVeQTAg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-29T15:37:15.161022Z"},"content_sha256":"57eff65efb131c0adaea5947854928f452d9b7bd2e19ada150b1b49058a43e63","schema_version":"1.0","event_id":"sha256:57eff65efb131c0adaea5947854928f452d9b7bd2e19ada150b1b49058a43e63"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/5NPC5SZTVUUVKXU7EYYXBNJVA7/bundle.json","state_url":"https://pith.science/pith/5NPC5SZTVUUVKXU7EYYXBNJVA7/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/5NPC5SZTVUUVKXU7EYYXBNJVA7/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":"2026-05-29T15:37:15Z","links":{"resolver":"https://pith.science/pith/5NPC5SZTVUUVKXU7EYYXBNJVA7","bundle":"https://pith.science/pith/5NPC5SZTVUUVKXU7EYYXBNJVA7/bundle.json","state":"https://pith.science/pith/5NPC5SZTVUUVKXU7EYYXBNJVA7/state.json","well_known_bundle":"https://pith.science/.well-known/pith/5NPC5SZTVUUVKXU7EYYXBNJVA7/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2018:5NPC5SZTVUUVKXU7EYYXBNJVA7","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":"fe746b5992d5ca8c0d969252be249a02befae2a2c16e275ec492a7377e76994f","cross_cats_sorted":["gr-qc"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.class-ph","submitted_at":"2018-05-01T19:14:49Z","title_canon_sha256":"fc2955b20e87b6f8859167a7dc53708c7b7720e5916f17a1939e6a242946d555"},"schema_version":"1.0","source":{"id":"1805.01372","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1805.01372","created_at":"2026-05-18T00:02:03Z"},{"alias_kind":"arxiv_version","alias_value":"1805.01372v2","created_at":"2026-05-18T00:02:03Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1805.01372","created_at":"2026-05-18T00:02:03Z"},{"alias_kind":"pith_short_12","alias_value":"5NPC5SZTVUUV","created_at":"2026-05-18T12:32:08Z"},{"alias_kind":"pith_short_16","alias_value":"5NPC5SZTVUUVKXU7","created_at":"2026-05-18T12:32:08Z"},{"alias_kind":"pith_short_8","alias_value":"5NPC5SZT","created_at":"2026-05-18T12:32:08Z"}],"graph_snapshots":[{"event_id":"sha256:57eff65efb131c0adaea5947854928f452d9b7bd2e19ada150b1b49058a43e63","target":"graph","created_at":"2026-05-18T00:02:03Z","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":"Angular momentum balance is examined in the context of the electrodynamics of a spinning charged sphere, which is allowed to possess any variable angular velocity. We calculate the electric and magnetic fields of the (hollow) sphere, and express them as expansions in powers of $\\tau/t_c \\ll 1$, the ratio of the light-travel time $\\tau$ across the sphere and the characteristic time scale $t_c$ of variation of the angular velocity. From the fields we compute the self-torque exerted by the fields on the sphere, and argue that only a piece of this self-torque can be associated with radiation react","authors_text":"Beatrice Bonga, Eric Poisson, Huan Yang","cross_cats":["gr-qc"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.class-ph","submitted_at":"2018-05-01T19:14:49Z","title":"Self-torque and angular momentum balance for a spinning charged sphere"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1805.01372","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":"sha256:9190540370e198f769de1239fa05afce4de17a507a2e1f054497a692fe7e4acf","target":"record","created_at":"2026-05-18T00:02:03Z","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":"fe746b5992d5ca8c0d969252be249a02befae2a2c16e275ec492a7377e76994f","cross_cats_sorted":["gr-qc"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.class-ph","submitted_at":"2018-05-01T19:14:49Z","title_canon_sha256":"fc2955b20e87b6f8859167a7dc53708c7b7720e5916f17a1939e6a242946d555"},"schema_version":"1.0","source":{"id":"1805.01372","kind":"arxiv","version":2}},"canonical_sha256":"eb5e2ecb33ad29555e9f263170b53507e4c0361d324a003d1896589a2231cdce","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"eb5e2ecb33ad29555e9f263170b53507e4c0361d324a003d1896589a2231cdce","first_computed_at":"2026-05-18T00:02:03.182747Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:02:03.182747Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"OS/wcga4aCcesQ6NZ6VnWDnJiNuDyiFQriDv099cN+z6lUhEbRpikv7HXEL8FOKWeFTsyctIvSJt7TxKSLjmCQ==","signature_status":"signed_v1","signed_at":"2026-05-18T00:02:03.183469Z","signed_message":"canonical_sha256_bytes"},"source_id":"1805.01372","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:9190540370e198f769de1239fa05afce4de17a507a2e1f054497a692fe7e4acf","sha256:57eff65efb131c0adaea5947854928f452d9b7bd2e19ada150b1b49058a43e63"],"state_sha256":"c9678ff433e421cfea781ff967186d0f135f24501749060a982eb2a4f7e19887"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"ImaRp2hysYfLcX1qV87A8XrtN5H+7wQMPmwv6wUvaomB2f+BEiRaod2hDjTS1NkhLGMxllAvBwuU2m3Uyfc8Cg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-29T15:37:15.165177Z","bundle_sha256":"25af4afd67765e7b63f182fbf33433dd6cca81515f2a3ee0d966e67a5d5c5ded"}}