{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2023:L2N66HM2BNWOYWERUBYH3PMX7Y","short_pith_number":"pith:L2N66HM2","canonical_record":{"source":{"id":"2307.15120","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"astro-ph.HE","submitted_at":"2023-07-27T18:00:04Z","cross_cats_sorted":["gr-qc"],"title_canon_sha256":"39142072c5e3dc464d86bd41c3cc5d966b53389abfe1f1b6f6c9b2af687a564d","abstract_canon_sha256":"452704cb018e1fd9d452fd12e1319f71b28c94621ac7526ae6b8d0370d5aa0e2"},"schema_version":"1.0"},"canonical_sha256":"5e9bef1d9a0b6cec5891a0707dbd97fe103c392036c2021b15f2743787402102","source":{"kind":"arxiv","id":"2307.15120","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2307.15120","created_at":"2026-07-05T06:35:30Z"},{"alias_kind":"arxiv_version","alias_value":"2307.15120v1","created_at":"2026-07-05T06:35:30Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2307.15120","created_at":"2026-07-05T06:35:30Z"},{"alias_kind":"pith_short_12","alias_value":"L2N66HM2BNWO","created_at":"2026-07-05T06:35:30Z"},{"alias_kind":"pith_short_16","alias_value":"L2N66HM2BNWOYWER","created_at":"2026-07-05T06:35:30Z"},{"alias_kind":"pith_short_8","alias_value":"L2N66HM2","created_at":"2026-07-05T06:35:30Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2023:L2N66HM2BNWOYWERUBYH3PMX7Y","target":"record","payload":{"canonical_record":{"source":{"id":"2307.15120","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"astro-ph.HE","submitted_at":"2023-07-27T18:00:04Z","cross_cats_sorted":["gr-qc"],"title_canon_sha256":"39142072c5e3dc464d86bd41c3cc5d966b53389abfe1f1b6f6c9b2af687a564d","abstract_canon_sha256":"452704cb018e1fd9d452fd12e1319f71b28c94621ac7526ae6b8d0370d5aa0e2"},"schema_version":"1.0"},"canonical_sha256":"5e9bef1d9a0b6cec5891a0707dbd97fe103c392036c2021b15f2743787402102","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T06:35:30.655259Z","signature_b64":"6/Xpvb1rD4YgxS4gzI0Enag0Id02dtO2HO3O8NlFGJNToTNP1nUsIPnsXen/E8P9cOC6C1e7dCbLRsr64uSTBQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"5e9bef1d9a0b6cec5891a0707dbd97fe103c392036c2021b15f2743787402102","last_reissued_at":"2026-07-05T06:35:30.654803Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T06:35:30.654803Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2307.15120","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":"2026-07-05T06:35:30Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"Ny3r60lPPcrhlC7aHN4To018fb8B8rKZL3lZHTGTGBG+ONki7hpO+f97HuNgaQkkMI2qMz7inunr92XYgjBzDg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-16T11:14:48.890468Z"},"content_sha256":"9cb8dc71743a755f4d03b6d943a773e991d0f1844badabc4d03acd341d531f3a","schema_version":"1.0","event_id":"sha256:9cb8dc71743a755f4d03b6d943a773e991d0f1844badabc4d03acd341d531f3a"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2023:L2N66HM2BNWOYWERUBYH3PMX7Y","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Shadow Implications: What does measuring the photon ring imply for gravity?","license":"http://creativecommons.org/licenses/by/4.0/","headline":"","cross_cats":["gr-qc"],"primary_cat":"astro-ph.HE","authors_text":"Avery E. Broderick, Boris Georgiev, Kiana Salehi","submitted_at":"2023-07-27T18:00:04Z","abstract_excerpt":"With the imaging and characterization of the horizon-scale images of M87* and Sgr A* by the Event Horizon Telescope (EHT), it has become possible to resolve the near-horizon region of astrophysical black holes. As a result, there has been considerable interest in the implications of the measurement of the shadow size, i.e., the asymptotic photon ring. We explore the general implications of such a measurement, identifying what is and, more importantly, is not constrained by such measurements, with applications to EHT and future instruments. We consider a general spherically symmetric metric, wh"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2307.15120","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/2307.15120/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":"2026-07-05T06:35:30Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"e1QMtc97IfnefwxPwY/AFXEHKFRXlKexHlFwc7C5H+6xVvsHpouaTPm9Za/E7YkpgahhXX8dNPtHpiYyJtjZDg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-16T11:14:48.890963Z"},"content_sha256":"da3dcdec6d4f4dbec521e9f2a1c72e1ab7591e010fb189e2b42be238e7123776","schema_version":"1.0","event_id":"sha256:da3dcdec6d4f4dbec521e9f2a1c72e1ab7591e010fb189e2b42be238e7123776"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/L2N66HM2BNWOYWERUBYH3PMX7Y/bundle.json","state_url":"https://pith.science/pith/L2N66HM2BNWOYWERUBYH3PMX7Y/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/L2N66HM2BNWOYWERUBYH3PMX7Y/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":"2026-08-16T11:14:48Z","links":{"resolver":"https://pith.science/pith/L2N66HM2BNWOYWERUBYH3PMX7Y","bundle":"https://pith.science/pith/L2N66HM2BNWOYWERUBYH3PMX7Y/bundle.json","state":"https://pith.science/pith/L2N66HM2BNWOYWERUBYH3PMX7Y/state.json","well_known_bundle":"https://pith.science/.well-known/pith/L2N66HM2BNWOYWERUBYH3PMX7Y/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2023:L2N66HM2BNWOYWERUBYH3PMX7Y","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":"452704cb018e1fd9d452fd12e1319f71b28c94621ac7526ae6b8d0370d5aa0e2","cross_cats_sorted":["gr-qc"],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"astro-ph.HE","submitted_at":"2023-07-27T18:00:04Z","title_canon_sha256":"39142072c5e3dc464d86bd41c3cc5d966b53389abfe1f1b6f6c9b2af687a564d"},"schema_version":"1.0","source":{"id":"2307.15120","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2307.15120","created_at":"2026-07-05T06:35:30Z"},{"alias_kind":"arxiv_version","alias_value":"2307.15120v1","created_at":"2026-07-05T06:35:30Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2307.15120","created_at":"2026-07-05T06:35:30Z"},{"alias_kind":"pith_short_12","alias_value":"L2N66HM2BNWO","created_at":"2026-07-05T06:35:30Z"},{"alias_kind":"pith_short_16","alias_value":"L2N66HM2BNWOYWER","created_at":"2026-07-05T06:35:30Z"},{"alias_kind":"pith_short_8","alias_value":"L2N66HM2","created_at":"2026-07-05T06:35:30Z"}],"graph_snapshots":[{"event_id":"sha256:da3dcdec6d4f4dbec521e9f2a1c72e1ab7591e010fb189e2b42be238e7123776","target":"graph","created_at":"2026-07-05T06:35:30Z","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/2307.15120/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"With the imaging and characterization of the horizon-scale images of M87* and Sgr A* by the Event Horizon Telescope (EHT), it has become possible to resolve the near-horizon region of astrophysical black holes. As a result, there has been considerable interest in the implications of the measurement of the shadow size, i.e., the asymptotic photon ring. We explore the general implications of such a measurement, identifying what is and, more importantly, is not constrained by such measurements, with applications to EHT and future instruments. We consider a general spherically symmetric metric, wh","authors_text":"Avery E. Broderick, Boris Georgiev, Kiana Salehi","cross_cats":["gr-qc"],"headline":"","license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"astro-ph.HE","submitted_at":"2023-07-27T18:00:04Z","title":"Shadow Implications: What does measuring the photon ring imply for gravity?"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2307.15120","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":"sha256:9cb8dc71743a755f4d03b6d943a773e991d0f1844badabc4d03acd341d531f3a","target":"record","created_at":"2026-07-05T06:35:30Z","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":"452704cb018e1fd9d452fd12e1319f71b28c94621ac7526ae6b8d0370d5aa0e2","cross_cats_sorted":["gr-qc"],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"astro-ph.HE","submitted_at":"2023-07-27T18:00:04Z","title_canon_sha256":"39142072c5e3dc464d86bd41c3cc5d966b53389abfe1f1b6f6c9b2af687a564d"},"schema_version":"1.0","source":{"id":"2307.15120","kind":"arxiv","version":1}},"canonical_sha256":"5e9bef1d9a0b6cec5891a0707dbd97fe103c392036c2021b15f2743787402102","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"5e9bef1d9a0b6cec5891a0707dbd97fe103c392036c2021b15f2743787402102","first_computed_at":"2026-07-05T06:35:30.654803Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T06:35:30.654803Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"6/Xpvb1rD4YgxS4gzI0Enag0Id02dtO2HO3O8NlFGJNToTNP1nUsIPnsXen/E8P9cOC6C1e7dCbLRsr64uSTBQ==","signature_status":"signed_v1","signed_at":"2026-07-05T06:35:30.655259Z","signed_message":"canonical_sha256_bytes"},"source_id":"2307.15120","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:9cb8dc71743a755f4d03b6d943a773e991d0f1844badabc4d03acd341d531f3a","sha256:da3dcdec6d4f4dbec521e9f2a1c72e1ab7591e010fb189e2b42be238e7123776"],"state_sha256":"6f0e96b7d1b0768f1371ffb7774a6308ed565c6360f11a546e9b7fe21619335e"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"3aIedD47cJZS5x0nk80ZIuHn0EmVhLbB2Xfk8xdwyszBy6zKWMo//gZLVX2HVd3sIxHzYinKFWcUcaXmCWdFBg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-16T11:14:48.895957Z","bundle_sha256":"3f43dcbae0c23ac670c3c10e19193e8592d1aad3f3881a7361aa695074cf8d0c"}}