{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2021:Z3WSCE6ON4SROWAS4GDGR2JYYR","short_pith_number":"pith:Z3WSCE6O","canonical_record":{"source":{"id":"2107.13533","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"gr-qc","submitted_at":"2021-07-26T17:38:36Z","cross_cats_sorted":["hep-th"],"title_canon_sha256":"19fc6e659e43b3d609344e4b748f0860bda026352f76752a264dc388216893fb","abstract_canon_sha256":"9dbcdad9d29aeb935f82ff2847d18fadaed3ca1504367b9b42782d5c0eb10034"},"schema_version":"1.0"},"canonical_sha256":"ceed2113ce6f25175812e18668e938c460fa7553f2b565ca9d13a90e383818e2","source":{"kind":"arxiv","id":"2107.13533","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2107.13533","created_at":"2026-07-05T03:14:56Z"},{"alias_kind":"arxiv_version","alias_value":"2107.13533v2","created_at":"2026-07-05T03:14:56Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2107.13533","created_at":"2026-07-05T03:14:56Z"},{"alias_kind":"pith_short_12","alias_value":"Z3WSCE6ON4SR","created_at":"2026-07-05T03:14:56Z"},{"alias_kind":"pith_short_16","alias_value":"Z3WSCE6ON4SROWAS","created_at":"2026-07-05T03:14:56Z"},{"alias_kind":"pith_short_8","alias_value":"Z3WSCE6O","created_at":"2026-07-05T03:14:56Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2021:Z3WSCE6ON4SROWAS4GDGR2JYYR","target":"record","payload":{"canonical_record":{"source":{"id":"2107.13533","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"gr-qc","submitted_at":"2021-07-26T17:38:36Z","cross_cats_sorted":["hep-th"],"title_canon_sha256":"19fc6e659e43b3d609344e4b748f0860bda026352f76752a264dc388216893fb","abstract_canon_sha256":"9dbcdad9d29aeb935f82ff2847d18fadaed3ca1504367b9b42782d5c0eb10034"},"schema_version":"1.0"},"canonical_sha256":"ceed2113ce6f25175812e18668e938c460fa7553f2b565ca9d13a90e383818e2","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T03:14:56.458989Z","signature_b64":"egHNDhscitjm7H0A34Sc3rKATCWtL+CMiDAZhdPOAmYc/a+U7UuDQTuqt94x/TLsBkvJ9n+lxhOMOFJrOw7oBA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"ceed2113ce6f25175812e18668e938c460fa7553f2b565ca9d13a90e383818e2","last_reissued_at":"2026-07-05T03:14:56.458551Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T03:14:56.458551Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2107.13533","source_version":2,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-07-05T03:14:56Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"PB5AUSBFFLFO1RWtkYwabRPDtTayfLxlO6koshkO8bJ9bh51AmUhErXtIt/k4fdIxxtBoOmjCvSdcF8+GeKICw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-03T17:17:22.457445Z"},"content_sha256":"fa3fced16f3fc37e61297db2c6e0fec9aec9b7465169b525671ce2fe443f11dc","schema_version":"1.0","event_id":"sha256:fa3fced16f3fc37e61297db2c6e0fec9aec9b7465169b525671ce2fe443f11dc"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2021:Z3WSCE6ON4SROWAS4GDGR2JYYR","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Can the Hubble tension be resolved by bulk viscosity?","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["hep-th"],"primary_cat":"gr-qc","authors_text":"Ben David Normann, Iver H{\\aa}kon Brevik","submitted_at":"2021-07-26T17:38:36Z","abstract_excerpt":"We show that the cosmic bulk viscosity estimated in our previous works is sufficient to bridge the $H_0$ value inferred from observations of the early universe with the value inferred from the local (late) universe."},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2107.13533","kind":"arxiv","version":2},"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/2107.13533/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":"2026-07-05T03:14:56Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"NCCf76DH5wEqmcCMWRu/XuuXSPnYk5SHOgi3lxJ/duJE67gHB2tDeEa6K9RhXbEdhdgNTnHacjxMZtFulM77Ag==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-03T17:17:22.457974Z"},"content_sha256":"ed5da15710abe3c1300897650b04c872690b2a051f4670a24bf60546f47221b9","schema_version":"1.0","event_id":"sha256:ed5da15710abe3c1300897650b04c872690b2a051f4670a24bf60546f47221b9"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/Z3WSCE6ON4SROWAS4GDGR2JYYR/bundle.json","state_url":"https://pith.science/pith/Z3WSCE6ON4SROWAS4GDGR2JYYR/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/Z3WSCE6ON4SROWAS4GDGR2JYYR/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":"2026-08-03T17:17:22Z","links":{"resolver":"https://pith.science/pith/Z3WSCE6ON4SROWAS4GDGR2JYYR","bundle":"https://pith.science/pith/Z3WSCE6ON4SROWAS4GDGR2JYYR/bundle.json","state":"https://pith.science/pith/Z3WSCE6ON4SROWAS4GDGR2JYYR/state.json","well_known_bundle":"https://pith.science/.well-known/pith/Z3WSCE6ON4SROWAS4GDGR2JYYR/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2021:Z3WSCE6ON4SROWAS4GDGR2JYYR","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":"9dbcdad9d29aeb935f82ff2847d18fadaed3ca1504367b9b42782d5c0eb10034","cross_cats_sorted":["hep-th"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"gr-qc","submitted_at":"2021-07-26T17:38:36Z","title_canon_sha256":"19fc6e659e43b3d609344e4b748f0860bda026352f76752a264dc388216893fb"},"schema_version":"1.0","source":{"id":"2107.13533","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2107.13533","created_at":"2026-07-05T03:14:56Z"},{"alias_kind":"arxiv_version","alias_value":"2107.13533v2","created_at":"2026-07-05T03:14:56Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2107.13533","created_at":"2026-07-05T03:14:56Z"},{"alias_kind":"pith_short_12","alias_value":"Z3WSCE6ON4SR","created_at":"2026-07-05T03:14:56Z"},{"alias_kind":"pith_short_16","alias_value":"Z3WSCE6ON4SROWAS","created_at":"2026-07-05T03:14:56Z"},{"alias_kind":"pith_short_8","alias_value":"Z3WSCE6O","created_at":"2026-07-05T03:14:56Z"}],"graph_snapshots":[{"event_id":"sha256:ed5da15710abe3c1300897650b04c872690b2a051f4670a24bf60546f47221b9","target":"graph","created_at":"2026-07-05T03:14:56Z","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/2107.13533/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"We show that the cosmic bulk viscosity estimated in our previous works is sufficient to bridge the $H_0$ value inferred from observations of the early universe with the value inferred from the local (late) universe.","authors_text":"Ben David Normann, Iver H{\\aa}kon Brevik","cross_cats":["hep-th"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"gr-qc","submitted_at":"2021-07-26T17:38:36Z","title":"Can the Hubble tension be resolved by bulk viscosity?"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2107.13533","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:fa3fced16f3fc37e61297db2c6e0fec9aec9b7465169b525671ce2fe443f11dc","target":"record","created_at":"2026-07-05T03:14:56Z","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":"9dbcdad9d29aeb935f82ff2847d18fadaed3ca1504367b9b42782d5c0eb10034","cross_cats_sorted":["hep-th"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"gr-qc","submitted_at":"2021-07-26T17:38:36Z","title_canon_sha256":"19fc6e659e43b3d609344e4b748f0860bda026352f76752a264dc388216893fb"},"schema_version":"1.0","source":{"id":"2107.13533","kind":"arxiv","version":2}},"canonical_sha256":"ceed2113ce6f25175812e18668e938c460fa7553f2b565ca9d13a90e383818e2","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"ceed2113ce6f25175812e18668e938c460fa7553f2b565ca9d13a90e383818e2","first_computed_at":"2026-07-05T03:14:56.458551Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T03:14:56.458551Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"egHNDhscitjm7H0A34Sc3rKATCWtL+CMiDAZhdPOAmYc/a+U7UuDQTuqt94x/TLsBkvJ9n+lxhOMOFJrOw7oBA==","signature_status":"signed_v1","signed_at":"2026-07-05T03:14:56.458989Z","signed_message":"canonical_sha256_bytes"},"source_id":"2107.13533","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:fa3fced16f3fc37e61297db2c6e0fec9aec9b7465169b525671ce2fe443f11dc","sha256:ed5da15710abe3c1300897650b04c872690b2a051f4670a24bf60546f47221b9"],"state_sha256":"23d1bec1e57d8c213836e2118bfeb9bd64b4add1ede5da2034e85d2c4f6a12cd"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"efJWovNqkkfR/XOTitcyZOlq3gwmZHyk2FmjcGD+wvvWx/Cj4wqNEJWJFlViwyB0Ax9B2CRtfDJkSv7uRdpVAA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-03T17:17:22.463102Z","bundle_sha256":"8bd67f6e039111da4c146c225201909ed2585c036d8cbe80121cb14235766a76"}}