{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2016:4RNLNPLH3UP4BN3MVIZD7R7QWS","short_pith_number":"pith:4RNLNPLH","canonical_record":{"source":{"id":"1612.01794","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"gr-qc","submitted_at":"2016-12-06T13:10:11Z","cross_cats_sorted":["astro-ph.CO"],"title_canon_sha256":"dc12b446c5dac15df7c314ba62bc5519dafc0c000bb1a5568be05451642591d9","abstract_canon_sha256":"f83403724f71e0467830c49f1810035a2f67afdb287eb25ab16215c876697200"},"schema_version":"1.0"},"canonical_sha256":"e45ab6bd67dd1fc0b76caa323fc7f0b4b6d5f8e821a8cda2f0101ccb490957c5","source":{"kind":"arxiv","id":"1612.01794","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1612.01794","created_at":"2026-05-18T00:52:54Z"},{"alias_kind":"arxiv_version","alias_value":"1612.01794v1","created_at":"2026-05-18T00:52:54Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1612.01794","created_at":"2026-05-18T00:52:54Z"},{"alias_kind":"pith_short_12","alias_value":"4RNLNPLH3UP4","created_at":"2026-05-18T12:29:58Z"},{"alias_kind":"pith_short_16","alias_value":"4RNLNPLH3UP4BN3M","created_at":"2026-05-18T12:29:58Z"},{"alias_kind":"pith_short_8","alias_value":"4RNLNPLH","created_at":"2026-05-18T12:29:58Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2016:4RNLNPLH3UP4BN3MVIZD7R7QWS","target":"record","payload":{"canonical_record":{"source":{"id":"1612.01794","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"gr-qc","submitted_at":"2016-12-06T13:10:11Z","cross_cats_sorted":["astro-ph.CO"],"title_canon_sha256":"dc12b446c5dac15df7c314ba62bc5519dafc0c000bb1a5568be05451642591d9","abstract_canon_sha256":"f83403724f71e0467830c49f1810035a2f67afdb287eb25ab16215c876697200"},"schema_version":"1.0"},"canonical_sha256":"e45ab6bd67dd1fc0b76caa323fc7f0b4b6d5f8e821a8cda2f0101ccb490957c5","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T00:52:54.901752Z","signature_b64":"IfqF3sT0vNAWz4KbJa7c9FZ1Qg3IhKd+TIgps5g8rTDBwwSwz28f8qgs73hTJyThk8TisoRKVDrnECVr8GZeBw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"e45ab6bd67dd1fc0b76caa323fc7f0b4b6d5f8e821a8cda2f0101ccb490957c5","last_reissued_at":"2026-05-18T00:52:54.901200Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T00:52:54.901200Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1612.01794","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":"2026-05-18T00:52:54Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"pso+luCRMr/Fe1HeILtT1XRinz5S4wcOuXeo1ORAQgr3hRQg07nDGfVTd917ljf9CWDmMi3TmdUpP+1OHhOQAA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-25T23:12:49.876427Z"},"content_sha256":"2a80a3a5a9e294042ef5f73562313410ea3988a08a9a63f82202fa242d77731c","schema_version":"1.0","event_id":"sha256:2a80a3a5a9e294042ef5f73562313410ea3988a08a9a63f82202fa242d77731c"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2016:4RNLNPLH3UP4BN3MVIZD7R7QWS","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Characteristic Properties of Two Different Viscous Cosmology Models for the Future Universe","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.CO"],"primary_cat":"gr-qc","authors_text":"Ben David Normann, Iver Brevik","submitted_at":"2016-12-06T13:10:11Z","abstract_excerpt":"We analyze characteristic properties of two different cosmological models: (i) a one-component dark energy model where the bulk viscosity $\\zeta$ is associated with the fluid as a whole, and (ii) a two-component model where $\\zeta$ is associated with a dark matter component $\\rho_{\\rm m}$ only, the dark energy component considered inviscid. Shear viscosity is omitted. We assume throughout the simple equation of state $p=w\\rho$, with $w$ a constant. In the one-component model we consider two possibilities, either to take $\\zeta$ proportional to the scalar expansion (equivalent to the Hubble par"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1612.01794","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":""},"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":"2026-05-18T00:52:54Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"4SGljcZVBuafbG0UmWImibEI4+c27MHxivA+AYVJ57uxemEdN1BRdhoNhwelkei2tEbPmPnlNx+2HJN2GvovCw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-25T23:12:49.877086Z"},"content_sha256":"33392fe6fb8bdfb39210763d7c4f565cb5f79dc24fc6c411fc7ce1ad64e02637","schema_version":"1.0","event_id":"sha256:33392fe6fb8bdfb39210763d7c4f565cb5f79dc24fc6c411fc7ce1ad64e02637"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/4RNLNPLH3UP4BN3MVIZD7R7QWS/bundle.json","state_url":"https://pith.science/pith/4RNLNPLH3UP4BN3MVIZD7R7QWS/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/4RNLNPLH3UP4BN3MVIZD7R7QWS/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":"2026-05-25T23:12:49Z","links":{"resolver":"https://pith.science/pith/4RNLNPLH3UP4BN3MVIZD7R7QWS","bundle":"https://pith.science/pith/4RNLNPLH3UP4BN3MVIZD7R7QWS/bundle.json","state":"https://pith.science/pith/4RNLNPLH3UP4BN3MVIZD7R7QWS/state.json","well_known_bundle":"https://pith.science/.well-known/pith/4RNLNPLH3UP4BN3MVIZD7R7QWS/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2016:4RNLNPLH3UP4BN3MVIZD7R7QWS","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":"f83403724f71e0467830c49f1810035a2f67afdb287eb25ab16215c876697200","cross_cats_sorted":["astro-ph.CO"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"gr-qc","submitted_at":"2016-12-06T13:10:11Z","title_canon_sha256":"dc12b446c5dac15df7c314ba62bc5519dafc0c000bb1a5568be05451642591d9"},"schema_version":"1.0","source":{"id":"1612.01794","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1612.01794","created_at":"2026-05-18T00:52:54Z"},{"alias_kind":"arxiv_version","alias_value":"1612.01794v1","created_at":"2026-05-18T00:52:54Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1612.01794","created_at":"2026-05-18T00:52:54Z"},{"alias_kind":"pith_short_12","alias_value":"4RNLNPLH3UP4","created_at":"2026-05-18T12:29:58Z"},{"alias_kind":"pith_short_16","alias_value":"4RNLNPLH3UP4BN3M","created_at":"2026-05-18T12:29:58Z"},{"alias_kind":"pith_short_8","alias_value":"4RNLNPLH","created_at":"2026-05-18T12:29:58Z"}],"graph_snapshots":[{"event_id":"sha256:33392fe6fb8bdfb39210763d7c4f565cb5f79dc24fc6c411fc7ce1ad64e02637","target":"graph","created_at":"2026-05-18T00:52:54Z","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"},"paper":{"abstract_excerpt":"We analyze characteristic properties of two different cosmological models: (i) a one-component dark energy model where the bulk viscosity $\\zeta$ is associated with the fluid as a whole, and (ii) a two-component model where $\\zeta$ is associated with a dark matter component $\\rho_{\\rm m}$ only, the dark energy component considered inviscid. Shear viscosity is omitted. We assume throughout the simple equation of state $p=w\\rho$, with $w$ a constant. In the one-component model we consider two possibilities, either to take $\\zeta$ proportional to the scalar expansion (equivalent to the Hubble par","authors_text":"Ben David Normann, Iver Brevik","cross_cats":["astro-ph.CO"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"gr-qc","submitted_at":"2016-12-06T13:10:11Z","title":"Characteristic Properties of Two Different Viscous Cosmology Models for the Future Universe"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1612.01794","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":"sha256:2a80a3a5a9e294042ef5f73562313410ea3988a08a9a63f82202fa242d77731c","target":"record","created_at":"2026-05-18T00:52:54Z","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":"f83403724f71e0467830c49f1810035a2f67afdb287eb25ab16215c876697200","cross_cats_sorted":["astro-ph.CO"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"gr-qc","submitted_at":"2016-12-06T13:10:11Z","title_canon_sha256":"dc12b446c5dac15df7c314ba62bc5519dafc0c000bb1a5568be05451642591d9"},"schema_version":"1.0","source":{"id":"1612.01794","kind":"arxiv","version":1}},"canonical_sha256":"e45ab6bd67dd1fc0b76caa323fc7f0b4b6d5f8e821a8cda2f0101ccb490957c5","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"e45ab6bd67dd1fc0b76caa323fc7f0b4b6d5f8e821a8cda2f0101ccb490957c5","first_computed_at":"2026-05-18T00:52:54.901200Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:52:54.901200Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"IfqF3sT0vNAWz4KbJa7c9FZ1Qg3IhKd+TIgps5g8rTDBwwSwz28f8qgs73hTJyThk8TisoRKVDrnECVr8GZeBw==","signature_status":"signed_v1","signed_at":"2026-05-18T00:52:54.901752Z","signed_message":"canonical_sha256_bytes"},"source_id":"1612.01794","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:2a80a3a5a9e294042ef5f73562313410ea3988a08a9a63f82202fa242d77731c","sha256:33392fe6fb8bdfb39210763d7c4f565cb5f79dc24fc6c411fc7ce1ad64e02637"],"state_sha256":"23d5c8f7d03b6d258695268a98c309b6b863e067702179a13a3d606ef70e9467"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"veWXBS7wd2QVfr6r2/jL4SQOgdSA4n2SejaO7ujUPn4EwGb0RbrjBDIhCTnTAseA+9RK9ThSVSZtZ9P4b7lsCw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-25T23:12:49.879855Z","bundle_sha256":"8954be593afd71d579528eb7baa120c663c0f8abdf3aab46692db61a859ddb25"}}