{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2021:6X35IVRXTJ2OOOKXPCUY7N2JNH","short_pith_number":"pith:6X35IVRX","canonical_record":{"source":{"id":"2105.05238","kind":"arxiv","version":4},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"gr-qc","submitted_at":"2021-05-11T17:55:41Z","cross_cats_sorted":["astro-ph.HE"],"title_canon_sha256":"ee0559a2314f3771ca823996a9d8c7a2cc7f523e65c748e098ece4e7a5f31e20","abstract_canon_sha256":"d5e4284b658efef68433585a03cc33ecf9668844bb2cea113809f9aac015edc3"},"schema_version":"1.0"},"canonical_sha256":"f5f7d456379a74e7395778a98fb74969d338a382dc6474c15099530398ace5dd","source":{"kind":"arxiv","id":"2105.05238","version":4},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2105.05238","created_at":"2026-07-05T07:32:14Z"},{"alias_kind":"arxiv_version","alias_value":"2105.05238v4","created_at":"2026-07-05T07:32:14Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2105.05238","created_at":"2026-07-05T07:32:14Z"},{"alias_kind":"pith_short_12","alias_value":"6X35IVRXTJ2O","created_at":"2026-07-05T07:32:14Z"},{"alias_kind":"pith_short_16","alias_value":"6X35IVRXTJ2OOOKX","created_at":"2026-07-05T07:32:14Z"},{"alias_kind":"pith_short_8","alias_value":"6X35IVRX","created_at":"2026-07-05T07:32:14Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2021:6X35IVRXTJ2OOOKXPCUY7N2JNH","target":"record","payload":{"canonical_record":{"source":{"id":"2105.05238","kind":"arxiv","version":4},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"gr-qc","submitted_at":"2021-05-11T17:55:41Z","cross_cats_sorted":["astro-ph.HE"],"title_canon_sha256":"ee0559a2314f3771ca823996a9d8c7a2cc7f523e65c748e098ece4e7a5f31e20","abstract_canon_sha256":"d5e4284b658efef68433585a03cc33ecf9668844bb2cea113809f9aac015edc3"},"schema_version":"1.0"},"canonical_sha256":"f5f7d456379a74e7395778a98fb74969d338a382dc6474c15099530398ace5dd","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T07:32:14.502095Z","signature_b64":"z0/0K7GdssdPLsCNqGUOME0gSRlYZEx+QXb+ms3+C+YCQJTezovlVAdQM2UZtmE8by2bScABKNIdLXTx20PgCQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"f5f7d456379a74e7395778a98fb74969d338a382dc6474c15099530398ace5dd","last_reissued_at":"2026-07-05T07:32:14.500942Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T07:32:14.500942Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2105.05238","source_version":4,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-07-05T07:32:14Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"e4lZtNE247xoYHdJBFOnCKTZdN1UuQ1j9vx5F/k9XpHfOnPkXlw2hvEk6ckiTKrvnbrWy2/A2GCpGk/ow8Z1BQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-07-12T13:56:16.731673Z"},"content_sha256":"089fcdf4e264cafac09a71926259324a0979adf1dfd12c30535304a80a3badcb","schema_version":"1.0","event_id":"sha256:089fcdf4e264cafac09a71926259324a0979adf1dfd12c30535304a80a3badcb"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2021:6X35IVRXTJ2OOOKXPCUY7N2JNH","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"A multimode quasi-normal spectrum from a perturbed black hole","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.HE"],"primary_cat":"gr-qc","authors_text":"Alexander H. Nitz, Alex B. Nielsen, Badri Krishnan, Collin D. Capano, Jahed Abedi, Julian Westerweck, Miriam Cabero, Shilpa Kastha, Yi-Fan Wang","submitted_at":"2021-05-11T17:55:41Z","abstract_excerpt":"When two black holes merge, the late stage of gravitational wave emission is a superposition of exponentially damped sinusoids. According to the black hole no-hair theorem, this ringdown spectrum depends only on the mass and angular momentum of the final black hole. An observation of more than one ringdown mode can test this fundamental prediction of general relativity. Here we provide strong observational evidence for a multimode black hole ringdown spectrum using the gravitational wave event GW190521, with a maximum Bayes factor of $56\\pm1$ ($1\\sigma$ uncertainty) preferring two fundamental "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2105.05238","kind":"arxiv","version":4},"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/2105.05238/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":"2026-07-05T07:32:14Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"iBC6le6O6dVI2ANqDGRlNDxIf9h2f5AsXqC6xPiZFSJvt3qkQ5WUVkuu+ofbnHQVAbDdpIWPh/mX9HYK86EIAA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-07-12T13:56:16.732066Z"},"content_sha256":"3034e80df268e921fcceb3583136217347c61c0e9d8e70df68dcfa9e8c4775b6","schema_version":"1.0","event_id":"sha256:3034e80df268e921fcceb3583136217347c61c0e9d8e70df68dcfa9e8c4775b6"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/6X35IVRXTJ2OOOKXPCUY7N2JNH/bundle.json","state_url":"https://pith.science/pith/6X35IVRXTJ2OOOKXPCUY7N2JNH/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/6X35IVRXTJ2OOOKXPCUY7N2JNH/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":"2026-07-12T13:56:16Z","links":{"resolver":"https://pith.science/pith/6X35IVRXTJ2OOOKXPCUY7N2JNH","bundle":"https://pith.science/pith/6X35IVRXTJ2OOOKXPCUY7N2JNH/bundle.json","state":"https://pith.science/pith/6X35IVRXTJ2OOOKXPCUY7N2JNH/state.json","well_known_bundle":"https://pith.science/.well-known/pith/6X35IVRXTJ2OOOKXPCUY7N2JNH/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2021:6X35IVRXTJ2OOOKXPCUY7N2JNH","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":"d5e4284b658efef68433585a03cc33ecf9668844bb2cea113809f9aac015edc3","cross_cats_sorted":["astro-ph.HE"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"gr-qc","submitted_at":"2021-05-11T17:55:41Z","title_canon_sha256":"ee0559a2314f3771ca823996a9d8c7a2cc7f523e65c748e098ece4e7a5f31e20"},"schema_version":"1.0","source":{"id":"2105.05238","kind":"arxiv","version":4}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2105.05238","created_at":"2026-07-05T07:32:14Z"},{"alias_kind":"arxiv_version","alias_value":"2105.05238v4","created_at":"2026-07-05T07:32:14Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2105.05238","created_at":"2026-07-05T07:32:14Z"},{"alias_kind":"pith_short_12","alias_value":"6X35IVRXTJ2O","created_at":"2026-07-05T07:32:14Z"},{"alias_kind":"pith_short_16","alias_value":"6X35IVRXTJ2OOOKX","created_at":"2026-07-05T07:32:14Z"},{"alias_kind":"pith_short_8","alias_value":"6X35IVRX","created_at":"2026-07-05T07:32:14Z"}],"graph_snapshots":[{"event_id":"sha256:3034e80df268e921fcceb3583136217347c61c0e9d8e70df68dcfa9e8c4775b6","target":"graph","created_at":"2026-07-05T07:32:14Z","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/2105.05238/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"When two black holes merge, the late stage of gravitational wave emission is a superposition of exponentially damped sinusoids. According to the black hole no-hair theorem, this ringdown spectrum depends only on the mass and angular momentum of the final black hole. An observation of more than one ringdown mode can test this fundamental prediction of general relativity. Here we provide strong observational evidence for a multimode black hole ringdown spectrum using the gravitational wave event GW190521, with a maximum Bayes factor of $56\\pm1$ ($1\\sigma$ uncertainty) preferring two fundamental ","authors_text":"Alexander H. Nitz, Alex B. Nielsen, Badri Krishnan, Collin D. Capano, Jahed Abedi, Julian Westerweck, Miriam Cabero, Shilpa Kastha, Yi-Fan Wang","cross_cats":["astro-ph.HE"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"gr-qc","submitted_at":"2021-05-11T17:55:41Z","title":"A multimode quasi-normal spectrum from a perturbed black hole"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2105.05238","kind":"arxiv","version":4},"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":"sha256:089fcdf4e264cafac09a71926259324a0979adf1dfd12c30535304a80a3badcb","target":"record","created_at":"2026-07-05T07:32:14Z","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":"d5e4284b658efef68433585a03cc33ecf9668844bb2cea113809f9aac015edc3","cross_cats_sorted":["astro-ph.HE"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"gr-qc","submitted_at":"2021-05-11T17:55:41Z","title_canon_sha256":"ee0559a2314f3771ca823996a9d8c7a2cc7f523e65c748e098ece4e7a5f31e20"},"schema_version":"1.0","source":{"id":"2105.05238","kind":"arxiv","version":4}},"canonical_sha256":"f5f7d456379a74e7395778a98fb74969d338a382dc6474c15099530398ace5dd","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"f5f7d456379a74e7395778a98fb74969d338a382dc6474c15099530398ace5dd","first_computed_at":"2026-07-05T07:32:14.500942Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T07:32:14.500942Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"z0/0K7GdssdPLsCNqGUOME0gSRlYZEx+QXb+ms3+C+YCQJTezovlVAdQM2UZtmE8by2bScABKNIdLXTx20PgCQ==","signature_status":"signed_v1","signed_at":"2026-07-05T07:32:14.502095Z","signed_message":"canonical_sha256_bytes"},"source_id":"2105.05238","source_kind":"arxiv","source_version":4}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:089fcdf4e264cafac09a71926259324a0979adf1dfd12c30535304a80a3badcb","sha256:3034e80df268e921fcceb3583136217347c61c0e9d8e70df68dcfa9e8c4775b6"],"state_sha256":"3aadd40525c56cc3b742ff3f80cce36240fc555c0f84dc23f252c8414fca651d"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"3MqayN+0r4BcIDbh7PT83FJtYaXJjdIqETJ+gtD/F8/2PY/XG+rAVgG8j75d1Vf28eGe+uNmF2v1P7JjDX+fCQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-07-12T13:56:16.734329Z","bundle_sha256":"0be8272f39577ccfc53ee2e78588f03ccd6fcfbb8cccfaee936f34620a4b176a"}}