{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2021:SC5WVLG3VLKWS5UMM2MAR35AHF","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":"ce4a2c9472f58506b085bd104f6cc702c43b8b4745e22a42a4cdff3183fe658d","cross_cats_sorted":["gr-qc","hep-th"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2021-09-30T07:58:18Z","title_canon_sha256":"390bb32d223118c979ae7ebde4d3749af0020e4c30f45af87218174f5518a5eb"},"schema_version":"1.0","source":{"id":"2109.14903","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2109.14903","created_at":"2026-07-05T03:26:20Z"},{"alias_kind":"arxiv_version","alias_value":"2109.14903v2","created_at":"2026-07-05T03:26:20Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2109.14903","created_at":"2026-07-05T03:26:20Z"},{"alias_kind":"pith_short_12","alias_value":"SC5WVLG3VLKW","created_at":"2026-07-05T03:26:20Z"},{"alias_kind":"pith_short_16","alias_value":"SC5WVLG3VLKWS5UM","created_at":"2026-07-05T03:26:20Z"},{"alias_kind":"pith_short_8","alias_value":"SC5WVLG3","created_at":"2026-07-05T03:26:20Z"}],"graph_snapshots":[{"event_id":"sha256:1ab00cd7f85398fb74ad28b9a04cca7f66315cd860223349ff3ff1217fde8e43","target":"graph","created_at":"2026-07-05T03:26:20Z","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"},"integrity":{"available":true,"clean":true,"detectors_run":[],"endpoint":"/pith/2109.14903/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"We examine the possibility for the existence of gravitomagnetic monopole ($n_*$) in M87* by using the results obtained from its first Event Horizon Telescope image. By numerically deducing the shadow sizes in Kerr-Taub-NUT (KTN) spacetime, we show that the shadow size increases with increasing $|n_*|$ for a fixed Kerr parameter $|a_*|$ in case of the KTN black hole, whereas for a KTN naked singularity it increases with increasing $n_*$ for a fixed $a_* > 0$ if $n_* > -\\cot 17^{\\circ}$ . In general, the asymmetry of shadow shape increases if the central dark object in M87 is a KTN/Kerr naked si","authors_text":"Chandrachur Chakraborty, M. Ghasemi-Nodehi, Qingjuan Yu, Youjun Lu","cross_cats":["gr-qc","hep-th"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2021-09-30T07:58:18Z","title":"Investigating the existence of gravitomagnetic monopole in M87*"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2109.14903","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":"sha256:7646eb77cd34a58d3e7a4c0e167ebad48baa07d50f87f303d7f874a4be85ebff","target":"record","created_at":"2026-07-05T03:26:20Z","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":"ce4a2c9472f58506b085bd104f6cc702c43b8b4745e22a42a4cdff3183fe658d","cross_cats_sorted":["gr-qc","hep-th"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2021-09-30T07:58:18Z","title_canon_sha256":"390bb32d223118c979ae7ebde4d3749af0020e4c30f45af87218174f5518a5eb"},"schema_version":"1.0","source":{"id":"2109.14903","kind":"arxiv","version":2}},"canonical_sha256":"90bb6aacdbaad569768c669808efa039782d873663dd6762fe01a5627185fb0e","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"90bb6aacdbaad569768c669808efa039782d873663dd6762fe01a5627185fb0e","first_computed_at":"2026-07-05T03:26:20.686076Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T03:26:20.686076Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"xGcBQw7p7DFQBUaZiABUj79EeilYas/wnQEODs1rhP5M4uIzC9gXPVEol5xlB4nDtLUh8eXCTOeyhRXdN761Cg==","signature_status":"signed_v1","signed_at":"2026-07-05T03:26:20.686582Z","signed_message":"canonical_sha256_bytes"},"source_id":"2109.14903","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:7646eb77cd34a58d3e7a4c0e167ebad48baa07d50f87f303d7f874a4be85ebff","sha256:1ab00cd7f85398fb74ad28b9a04cca7f66315cd860223349ff3ff1217fde8e43"],"state_sha256":"a0a3f2f985ce496b3022b0be4f4d8ee4d56ae9cb367c68ccf3d1aedbb7827f62"}