{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2019:K3GSY6Z6RA23PXEOTPIK5FI3DV","short_pith_number":"pith:K3GSY6Z6","canonical_record":{"source":{"id":"1908.11794","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"gr-qc","submitted_at":"2019-08-30T15:36:22Z","cross_cats_sorted":["astro-ph.HE"],"title_canon_sha256":"14b776fcfdeff84f18e268dc18621e429f25d1663517bb1f42fc3066310d7c56","abstract_canon_sha256":"d0f2fb9b8aaf99fd61f17f45b99e6e4bf9fba316fd636db8d5e8b60e4d0a95a2"},"schema_version":"1.0"},"canonical_sha256":"56cd2c7b3e8835b7dc8e9bd0ae951b1d51de1261a4c6ea0e6aedc55ee581d991","source":{"kind":"arxiv","id":"1908.11794","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1908.11794","created_at":"2026-07-05T00:03:01Z"},{"alias_kind":"arxiv_version","alias_value":"1908.11794v1","created_at":"2026-07-05T00:03:01Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1908.11794","created_at":"2026-07-05T00:03:01Z"},{"alias_kind":"pith_short_12","alias_value":"K3GSY6Z6RA23","created_at":"2026-07-05T00:03:01Z"},{"alias_kind":"pith_short_16","alias_value":"K3GSY6Z6RA23PXEO","created_at":"2026-07-05T00:03:01Z"},{"alias_kind":"pith_short_8","alias_value":"K3GSY6Z6","created_at":"2026-07-05T00:03:01Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2019:K3GSY6Z6RA23PXEOTPIK5FI3DV","target":"record","payload":{"canonical_record":{"source":{"id":"1908.11794","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"gr-qc","submitted_at":"2019-08-30T15:36:22Z","cross_cats_sorted":["astro-ph.HE"],"title_canon_sha256":"14b776fcfdeff84f18e268dc18621e429f25d1663517bb1f42fc3066310d7c56","abstract_canon_sha256":"d0f2fb9b8aaf99fd61f17f45b99e6e4bf9fba316fd636db8d5e8b60e4d0a95a2"},"schema_version":"1.0"},"canonical_sha256":"56cd2c7b3e8835b7dc8e9bd0ae951b1d51de1261a4c6ea0e6aedc55ee581d991","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T00:03:01.105712Z","signature_b64":"yL479sRUwCb7MRfDDJkqJW/5VhsuhUzfIvl2CzjGUtAWRuFx4iIhyMvsFEbSznKpB9EuCqxVni2ZeEFm0r9iBg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"56cd2c7b3e8835b7dc8e9bd0ae951b1d51de1261a4c6ea0e6aedc55ee581d991","last_reissued_at":"2026-07-05T00:03:01.105283Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T00:03:01.105283Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1908.11794","source_version":1,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-07-05T00:03:01Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"SJXTE5wwHFsdzxOr3/iW4dz05jdhZCfP/ZWP6OkltMtT5fHFO9+tvnZlQU3/yGP53/5PIgt3+5yGuNo26nzjAw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-09T14:59:06.472733Z"},"content_sha256":"736dfdde691cf1a8d9fc1b4eb896f554dd7101549b7fb16b3057221fb28257fd","schema_version":"1.0","event_id":"sha256:736dfdde691cf1a8d9fc1b4eb896f554dd7101549b7fb16b3057221fb28257fd"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2019:K3GSY6Z6RA23PXEOTPIK5FI3DV","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Testing the Schwarzschild metric in a strong field region with the Event Horizon Telescope","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.HE"],"primary_cat":"gr-qc","authors_text":"S. X. Tian, Zong-Hong Zhu","submitted_at":"2019-08-30T15:36:22Z","abstract_excerpt":"Testing gravity theory in the strong field region becomes a reality due to the observations of gravitational waves and black hole shadows. In this paper, we discuss how to constrain the possible deviations of the classical general relativity with the image of M87* observed by the Event Horizon Telescope. More precisely, we want to know where is the event horizon for a non-rotating black hole. General relativity predicts the horizon is located at the Schwarzschild radius $r_\\textrm{s}$, while other gravity theories may give different predictions. We propose a parameterized Schwarzschild metric "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1908.11794","kind":"arxiv","version":1},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/1908.11794/integrity.json","findings":[],"available":true,"detectors_run":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938"},"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":"2026-07-05T00:03:01Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"Xq1V4SpeF/Thc8gE12IgmveVYdUhP2ka+dLes6LZA14qqIsge8QjpZZ/hmpRTJ5Ya0tiY9XtVApLfiC6AzR4AA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-09T14:59:06.473269Z"},"content_sha256":"c2b14317cc6809e386d4772355a97def6175dfa646bbcc7fd9904311140c6b55","schema_version":"1.0","event_id":"sha256:c2b14317cc6809e386d4772355a97def6175dfa646bbcc7fd9904311140c6b55"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/K3GSY6Z6RA23PXEOTPIK5FI3DV/bundle.json","state_url":"https://pith.science/pith/K3GSY6Z6RA23PXEOTPIK5FI3DV/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/K3GSY6Z6RA23PXEOTPIK5FI3DV/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":"2026-08-09T14:59:06Z","links":{"resolver":"https://pith.science/pith/K3GSY6Z6RA23PXEOTPIK5FI3DV","bundle":"https://pith.science/pith/K3GSY6Z6RA23PXEOTPIK5FI3DV/bundle.json","state":"https://pith.science/pith/K3GSY6Z6RA23PXEOTPIK5FI3DV/state.json","well_known_bundle":"https://pith.science/.well-known/pith/K3GSY6Z6RA23PXEOTPIK5FI3DV/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2019:K3GSY6Z6RA23PXEOTPIK5FI3DV","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":"d0f2fb9b8aaf99fd61f17f45b99e6e4bf9fba316fd636db8d5e8b60e4d0a95a2","cross_cats_sorted":["astro-ph.HE"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"gr-qc","submitted_at":"2019-08-30T15:36:22Z","title_canon_sha256":"14b776fcfdeff84f18e268dc18621e429f25d1663517bb1f42fc3066310d7c56"},"schema_version":"1.0","source":{"id":"1908.11794","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1908.11794","created_at":"2026-07-05T00:03:01Z"},{"alias_kind":"arxiv_version","alias_value":"1908.11794v1","created_at":"2026-07-05T00:03:01Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1908.11794","created_at":"2026-07-05T00:03:01Z"},{"alias_kind":"pith_short_12","alias_value":"K3GSY6Z6RA23","created_at":"2026-07-05T00:03:01Z"},{"alias_kind":"pith_short_16","alias_value":"K3GSY6Z6RA23PXEO","created_at":"2026-07-05T00:03:01Z"},{"alias_kind":"pith_short_8","alias_value":"K3GSY6Z6","created_at":"2026-07-05T00:03:01Z"}],"graph_snapshots":[{"event_id":"sha256:c2b14317cc6809e386d4772355a97def6175dfa646bbcc7fd9904311140c6b55","target":"graph","created_at":"2026-07-05T00:03:01Z","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/1908.11794/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"Testing gravity theory in the strong field region becomes a reality due to the observations of gravitational waves and black hole shadows. In this paper, we discuss how to constrain the possible deviations of the classical general relativity with the image of M87* observed by the Event Horizon Telescope. More precisely, we want to know where is the event horizon for a non-rotating black hole. General relativity predicts the horizon is located at the Schwarzschild radius $r_\\textrm{s}$, while other gravity theories may give different predictions. We propose a parameterized Schwarzschild metric ","authors_text":"S. X. Tian, Zong-Hong Zhu","cross_cats":["astro-ph.HE"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"gr-qc","submitted_at":"2019-08-30T15:36:22Z","title":"Testing the Schwarzschild metric in a strong field region with the Event Horizon Telescope"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1908.11794","kind":"arxiv","version":1},"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":"sha256:736dfdde691cf1a8d9fc1b4eb896f554dd7101549b7fb16b3057221fb28257fd","target":"record","created_at":"2026-07-05T00:03:01Z","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":"d0f2fb9b8aaf99fd61f17f45b99e6e4bf9fba316fd636db8d5e8b60e4d0a95a2","cross_cats_sorted":["astro-ph.HE"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"gr-qc","submitted_at":"2019-08-30T15:36:22Z","title_canon_sha256":"14b776fcfdeff84f18e268dc18621e429f25d1663517bb1f42fc3066310d7c56"},"schema_version":"1.0","source":{"id":"1908.11794","kind":"arxiv","version":1}},"canonical_sha256":"56cd2c7b3e8835b7dc8e9bd0ae951b1d51de1261a4c6ea0e6aedc55ee581d991","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"56cd2c7b3e8835b7dc8e9bd0ae951b1d51de1261a4c6ea0e6aedc55ee581d991","first_computed_at":"2026-07-05T00:03:01.105283Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T00:03:01.105283Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"yL479sRUwCb7MRfDDJkqJW/5VhsuhUzfIvl2CzjGUtAWRuFx4iIhyMvsFEbSznKpB9EuCqxVni2ZeEFm0r9iBg==","signature_status":"signed_v1","signed_at":"2026-07-05T00:03:01.105712Z","signed_message":"canonical_sha256_bytes"},"source_id":"1908.11794","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:736dfdde691cf1a8d9fc1b4eb896f554dd7101549b7fb16b3057221fb28257fd","sha256:c2b14317cc6809e386d4772355a97def6175dfa646bbcc7fd9904311140c6b55"],"state_sha256":"6567d7db9172c870dcf499fd8b59f8fe15af29f49170b4a9f184038cc2297219"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"qxqI+fXL+Pu5iJmp4DKLr8BrfakDZ9//276ZOd8lTj+OEPqGkRzqzdOJBZSn6dRRdH7aZGZm/1Wd75PPXA4qDw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-09T14:59:06.478712Z","bundle_sha256":"69789dabc85bea8b4f334a8f74faf04094a3bc2413e71455c2b8dbddafaaccf0"}}