{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2008:N4A6OLU6JWD6R3YHV4GKWDQ67J","short_pith_number":"pith:N4A6OLU6","canonical_record":{"source":{"id":"0812.1328","kind":"arxiv","version":3},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph","submitted_at":"2008-12-07T05:57:00Z","cross_cats_sorted":["gr-qc"],"title_canon_sha256":"fff3a4b2beb53f05170f4904a9e00d740e17a2e0ad2f517d56898a7c795f27e8","abstract_canon_sha256":"c0512c2be405473af2669206192768a34ede7aa718110b4c53ea06c3fafad66b"},"schema_version":"1.0"},"canonical_sha256":"6f01e72e9e4d87e8ef07af0cab0e1efa57930b89931a5b0e69b0d9d0b72ae735","source":{"kind":"arxiv","id":"0812.1328","version":3},"source_aliases":[{"alias_kind":"arxiv","alias_value":"0812.1328","created_at":"2026-07-04T15:37:23Z"},{"alias_kind":"arxiv_version","alias_value":"0812.1328v3","created_at":"2026-07-04T15:37:23Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.0812.1328","created_at":"2026-07-04T15:37:23Z"},{"alias_kind":"pith_short_12","alias_value":"N4A6OLU6JWD6","created_at":"2026-07-04T15:37:23Z"},{"alias_kind":"pith_short_16","alias_value":"N4A6OLU6JWD6R3YH","created_at":"2026-07-04T15:37:23Z"},{"alias_kind":"pith_short_8","alias_value":"N4A6OLU6","created_at":"2026-07-04T15:37:23Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2008:N4A6OLU6JWD6R3YHV4GKWDQ67J","target":"record","payload":{"canonical_record":{"source":{"id":"0812.1328","kind":"arxiv","version":3},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph","submitted_at":"2008-12-07T05:57:00Z","cross_cats_sorted":["gr-qc"],"title_canon_sha256":"fff3a4b2beb53f05170f4904a9e00d740e17a2e0ad2f517d56898a7c795f27e8","abstract_canon_sha256":"c0512c2be405473af2669206192768a34ede7aa718110b4c53ea06c3fafad66b"},"schema_version":"1.0"},"canonical_sha256":"6f01e72e9e4d87e8ef07af0cab0e1efa57930b89931a5b0e69b0d9d0b72ae735","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-04T15:37:23.857981Z","signature_b64":"e1rZRZr/YWTJk3dThTVfZmcirzwfZ9E1uZQ4n6cjhefASq1X3rml7zF6WvosUlrbO0X/OJTJkDBaKcA90bVVCg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"6f01e72e9e4d87e8ef07af0cab0e1efa57930b89931a5b0e69b0d9d0b72ae735","last_reissued_at":"2026-07-04T15:37:23.857580Z","signature_status":"signed_v1","first_computed_at":"2026-07-04T15:37:23.857580Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"0812.1328","source_version":3,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-07-04T15:37:23Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"9okLO1/90EMvvSi0nayAlI2qvOTGuB2lPVGzErs61TlhZwVglncEze6JetXOnHetW8c1JXoBFLQewEDNHNHfCw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-04T16:21:48.412765Z"},"content_sha256":"80866b0be140dbad19fe6fc903c54527d3056c7ab0f20d11c58e5e5f3d076ec4","schema_version":"1.0","event_id":"sha256:80866b0be140dbad19fe6fc903c54527d3056c7ab0f20d11c58e5e5f3d076ec4"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2008:N4A6OLU6JWD6R3YHV4GKWDQ67J","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Apparent shape of super-spinning black holes","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["gr-qc"],"primary_cat":"astro-ph","authors_text":"Cosimo Bambi, Katherine Freese","submitted_at":"2008-12-07T05:57:00Z","abstract_excerpt":"We consider the possibility that astrophysical Black Holes (BHs) can violate the Kerr bound; i.e., they can have angular momentum greater than BH mass, $J > M$. We discuss implications on the BH apparent shape. Even if the bound is violated by a small amount, the shadow cast by the BH changes significantly (it is $\\sim$ an order of magnitude smaller) from the case with $J \\le M$ and can be used as a clear observational signature in the search for super--spinning BHs. We discuss briefly recent observations in the mm range of the super--massive BH at the Center of the Galaxy, speculating on the "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0812.1328","kind":"arxiv","version":3},"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/0812.1328/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":"2026-07-04T15:37:23Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"7EXOVSwEHKLoCvHClUVQKCAt2Eiv/3fiAFuPoc/G4pzJTYNrG5mHeHenusSMee0IR9ivyOvH2kCPSwm4YNr4Aw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-04T16:21:48.413725Z"},"content_sha256":"78d520ab254f6645ac07ba0f4b400a936e044b4532de4f39c036302e3d839b75","schema_version":"1.0","event_id":"sha256:78d520ab254f6645ac07ba0f4b400a936e044b4532de4f39c036302e3d839b75"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/N4A6OLU6JWD6R3YHV4GKWDQ67J/bundle.json","state_url":"https://pith.science/pith/N4A6OLU6JWD6R3YHV4GKWDQ67J/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/N4A6OLU6JWD6R3YHV4GKWDQ67J/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":"2026-08-04T16:21:48Z","links":{"resolver":"https://pith.science/pith/N4A6OLU6JWD6R3YHV4GKWDQ67J","bundle":"https://pith.science/pith/N4A6OLU6JWD6R3YHV4GKWDQ67J/bundle.json","state":"https://pith.science/pith/N4A6OLU6JWD6R3YHV4GKWDQ67J/state.json","well_known_bundle":"https://pith.science/.well-known/pith/N4A6OLU6JWD6R3YHV4GKWDQ67J/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2008:N4A6OLU6JWD6R3YHV4GKWDQ67J","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":"c0512c2be405473af2669206192768a34ede7aa718110b4c53ea06c3fafad66b","cross_cats_sorted":["gr-qc"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph","submitted_at":"2008-12-07T05:57:00Z","title_canon_sha256":"fff3a4b2beb53f05170f4904a9e00d740e17a2e0ad2f517d56898a7c795f27e8"},"schema_version":"1.0","source":{"id":"0812.1328","kind":"arxiv","version":3}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"0812.1328","created_at":"2026-07-04T15:37:23Z"},{"alias_kind":"arxiv_version","alias_value":"0812.1328v3","created_at":"2026-07-04T15:37:23Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.0812.1328","created_at":"2026-07-04T15:37:23Z"},{"alias_kind":"pith_short_12","alias_value":"N4A6OLU6JWD6","created_at":"2026-07-04T15:37:23Z"},{"alias_kind":"pith_short_16","alias_value":"N4A6OLU6JWD6R3YH","created_at":"2026-07-04T15:37:23Z"},{"alias_kind":"pith_short_8","alias_value":"N4A6OLU6","created_at":"2026-07-04T15:37:23Z"}],"graph_snapshots":[{"event_id":"sha256:78d520ab254f6645ac07ba0f4b400a936e044b4532de4f39c036302e3d839b75","target":"graph","created_at":"2026-07-04T15:37:23Z","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/0812.1328/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"We consider the possibility that astrophysical Black Holes (BHs) can violate the Kerr bound; i.e., they can have angular momentum greater than BH mass, $J > M$. We discuss implications on the BH apparent shape. Even if the bound is violated by a small amount, the shadow cast by the BH changes significantly (it is $\\sim$ an order of magnitude smaller) from the case with $J \\le M$ and can be used as a clear observational signature in the search for super--spinning BHs. We discuss briefly recent observations in the mm range of the super--massive BH at the Center of the Galaxy, speculating on the ","authors_text":"Cosimo Bambi, Katherine Freese","cross_cats":["gr-qc"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph","submitted_at":"2008-12-07T05:57:00Z","title":"Apparent shape of super-spinning black holes"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0812.1328","kind":"arxiv","version":3},"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":"sha256:80866b0be140dbad19fe6fc903c54527d3056c7ab0f20d11c58e5e5f3d076ec4","target":"record","created_at":"2026-07-04T15:37:23Z","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":"c0512c2be405473af2669206192768a34ede7aa718110b4c53ea06c3fafad66b","cross_cats_sorted":["gr-qc"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph","submitted_at":"2008-12-07T05:57:00Z","title_canon_sha256":"fff3a4b2beb53f05170f4904a9e00d740e17a2e0ad2f517d56898a7c795f27e8"},"schema_version":"1.0","source":{"id":"0812.1328","kind":"arxiv","version":3}},"canonical_sha256":"6f01e72e9e4d87e8ef07af0cab0e1efa57930b89931a5b0e69b0d9d0b72ae735","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"6f01e72e9e4d87e8ef07af0cab0e1efa57930b89931a5b0e69b0d9d0b72ae735","first_computed_at":"2026-07-04T15:37:23.857580Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-04T15:37:23.857580Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"e1rZRZr/YWTJk3dThTVfZmcirzwfZ9E1uZQ4n6cjhefASq1X3rml7zF6WvosUlrbO0X/OJTJkDBaKcA90bVVCg==","signature_status":"signed_v1","signed_at":"2026-07-04T15:37:23.857981Z","signed_message":"canonical_sha256_bytes"},"source_id":"0812.1328","source_kind":"arxiv","source_version":3}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:80866b0be140dbad19fe6fc903c54527d3056c7ab0f20d11c58e5e5f3d076ec4","sha256:78d520ab254f6645ac07ba0f4b400a936e044b4532de4f39c036302e3d839b75"],"state_sha256":"ab22c00c37d3da13b9fe60144d97a96523e2e3ee061e120927529b6e90b59f11"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"J2OFbYd0pfZEeDaVHMW8fSxrHrkPjm8G508TwIxH5uvezybmp3n444ZyD7VBtneeOAUid4rXXa5aQyVQsIQdAg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-04T16:21:48.419571Z","bundle_sha256":"e2e345ed945f929c81e995783cc00f7522930e2bf1f6ee68a914c3dfcaf9a687"}}