{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2014:6H5DV3ALEAVHBQE6GVDHQC7NTQ","short_pith_number":"pith:6H5DV3AL","canonical_record":{"source":{"id":"1411.5154","kind":"arxiv","version":3},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"gr-qc","submitted_at":"2014-11-19T09:22:31Z","cross_cats_sorted":[],"title_canon_sha256":"6f4ea11d6cf0629c1abe881f43969dd4f327ecd110b6fa5e8da771ea58234b96","abstract_canon_sha256":"4bac8edc180915d2cf4999c9f7beeb92db3b2894b4bf2ac49bef12da8e65a888"},"schema_version":"1.0"},"canonical_sha256":"f1fa3aec0b202a70c09e3546780bed9c10cf8d8908bfea5e8126dda6417014f4","source":{"kind":"arxiv","id":"1411.5154","version":3},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1411.5154","created_at":"2026-05-18T01:16:09Z"},{"alias_kind":"arxiv_version","alias_value":"1411.5154v3","created_at":"2026-05-18T01:16:09Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1411.5154","created_at":"2026-05-18T01:16:09Z"},{"alias_kind":"pith_short_12","alias_value":"6H5DV3ALEAVH","created_at":"2026-05-18T12:28:16Z"},{"alias_kind":"pith_short_16","alias_value":"6H5DV3ALEAVHBQE6","created_at":"2026-05-18T12:28:16Z"},{"alias_kind":"pith_short_8","alias_value":"6H5DV3AL","created_at":"2026-05-18T12:28:16Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2014:6H5DV3ALEAVHBQE6GVDHQC7NTQ","target":"record","payload":{"canonical_record":{"source":{"id":"1411.5154","kind":"arxiv","version":3},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"gr-qc","submitted_at":"2014-11-19T09:22:31Z","cross_cats_sorted":[],"title_canon_sha256":"6f4ea11d6cf0629c1abe881f43969dd4f327ecd110b6fa5e8da771ea58234b96","abstract_canon_sha256":"4bac8edc180915d2cf4999c9f7beeb92db3b2894b4bf2ac49bef12da8e65a888"},"schema_version":"1.0"},"canonical_sha256":"f1fa3aec0b202a70c09e3546780bed9c10cf8d8908bfea5e8126dda6417014f4","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:16:09.965852Z","signature_b64":"K/gKJrw+0OCx3mzTHx2y+eFMjGeL2xW0+X3vPl5dnHaCrz0/KNDT7CAHzfdmdbJ2+bsy/RDhT/pCBAQDVTsYCw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"f1fa3aec0b202a70c09e3546780bed9c10cf8d8908bfea5e8126dda6417014f4","last_reissued_at":"2026-05-18T01:16:09.965311Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:16:09.965311Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1411.5154","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":"2026-05-18T01:16:09Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"Jla0C+98aKKM7wkbpmURcURsYurRBpI5BzbNTfsC8bWfB5X/dLfuPeln4uiQYlAUf3aR7Kpqbg+P45Jv/GdtAQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-20T21:16:20.108018Z"},"content_sha256":"331a8d861d120a821ba95c38b8339275a523c524d3aab2d4777a88adbe418b95","schema_version":"1.0","event_id":"sha256:331a8d861d120a821ba95c38b8339275a523c524d3aab2d4777a88adbe418b95"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2014:6H5DV3ALEAVHBQE6GVDHQC7NTQ","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Bulk viscous matter and recent acceleration of the Universe","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"gr-qc","authors_text":"Athira Sasidharan, Titus K. Mathew","submitted_at":"2014-11-19T09:22:31Z","abstract_excerpt":"We consider a cosmological model dominated by bulk viscous matter with total bulk viscosity coefficient proportional to the velocity and acceleration of the expansion of the universe in such a way that $\\zeta=\\zeta_{0}+\\zeta_{1}\\frac{\\dot{a}}{a}+\\zeta_{2}\\frac{\\ddot{a}}{\\dot{a}}.$ We show that there exist two limiting conditions in the bulk viscous coefficients, ($\\zeta_{0}$, $\\zeta_{1}$, $\\zeta_{2}$) which corresponds to a universe having a Big-Bang at the origin, followed by an early decelerated epoch and then making a smooth transition into an accelerating epoch. We have constrained the mod"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1411.5154","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":""},"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":"2026-05-18T01:16:09Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"iZC6bzOSj4cByes57zV/d+mV90I/hzg2buJARFsgAP5wEz7AzI8DSexubFYUky1r0Kj3TnVAc1hkPFuzl4DBCQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-20T21:16:20.108378Z"},"content_sha256":"fd65bfe27414b953dd8ea370fbe89e6c98662594f38e0cfa2d78c3cd014c312a","schema_version":"1.0","event_id":"sha256:fd65bfe27414b953dd8ea370fbe89e6c98662594f38e0cfa2d78c3cd014c312a"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/6H5DV3ALEAVHBQE6GVDHQC7NTQ/bundle.json","state_url":"https://pith.science/pith/6H5DV3ALEAVHBQE6GVDHQC7NTQ/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/6H5DV3ALEAVHBQE6GVDHQC7NTQ/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":"2026-06-20T21:16:20Z","links":{"resolver":"https://pith.science/pith/6H5DV3ALEAVHBQE6GVDHQC7NTQ","bundle":"https://pith.science/pith/6H5DV3ALEAVHBQE6GVDHQC7NTQ/bundle.json","state":"https://pith.science/pith/6H5DV3ALEAVHBQE6GVDHQC7NTQ/state.json","well_known_bundle":"https://pith.science/.well-known/pith/6H5DV3ALEAVHBQE6GVDHQC7NTQ/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2014:6H5DV3ALEAVHBQE6GVDHQC7NTQ","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":"4bac8edc180915d2cf4999c9f7beeb92db3b2894b4bf2ac49bef12da8e65a888","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"gr-qc","submitted_at":"2014-11-19T09:22:31Z","title_canon_sha256":"6f4ea11d6cf0629c1abe881f43969dd4f327ecd110b6fa5e8da771ea58234b96"},"schema_version":"1.0","source":{"id":"1411.5154","kind":"arxiv","version":3}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1411.5154","created_at":"2026-05-18T01:16:09Z"},{"alias_kind":"arxiv_version","alias_value":"1411.5154v3","created_at":"2026-05-18T01:16:09Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1411.5154","created_at":"2026-05-18T01:16:09Z"},{"alias_kind":"pith_short_12","alias_value":"6H5DV3ALEAVH","created_at":"2026-05-18T12:28:16Z"},{"alias_kind":"pith_short_16","alias_value":"6H5DV3ALEAVHBQE6","created_at":"2026-05-18T12:28:16Z"},{"alias_kind":"pith_short_8","alias_value":"6H5DV3AL","created_at":"2026-05-18T12:28:16Z"}],"graph_snapshots":[{"event_id":"sha256:fd65bfe27414b953dd8ea370fbe89e6c98662594f38e0cfa2d78c3cd014c312a","target":"graph","created_at":"2026-05-18T01:16:09Z","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 consider a cosmological model dominated by bulk viscous matter with total bulk viscosity coefficient proportional to the velocity and acceleration of the expansion of the universe in such a way that $\\zeta=\\zeta_{0}+\\zeta_{1}\\frac{\\dot{a}}{a}+\\zeta_{2}\\frac{\\ddot{a}}{\\dot{a}}.$ We show that there exist two limiting conditions in the bulk viscous coefficients, ($\\zeta_{0}$, $\\zeta_{1}$, $\\zeta_{2}$) which corresponds to a universe having a Big-Bang at the origin, followed by an early decelerated epoch and then making a smooth transition into an accelerating epoch. We have constrained the mod","authors_text":"Athira Sasidharan, Titus K. Mathew","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"gr-qc","submitted_at":"2014-11-19T09:22:31Z","title":"Bulk viscous matter and recent acceleration of the Universe"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1411.5154","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":"sha256:331a8d861d120a821ba95c38b8339275a523c524d3aab2d4777a88adbe418b95","target":"record","created_at":"2026-05-18T01:16:09Z","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":"4bac8edc180915d2cf4999c9f7beeb92db3b2894b4bf2ac49bef12da8e65a888","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"gr-qc","submitted_at":"2014-11-19T09:22:31Z","title_canon_sha256":"6f4ea11d6cf0629c1abe881f43969dd4f327ecd110b6fa5e8da771ea58234b96"},"schema_version":"1.0","source":{"id":"1411.5154","kind":"arxiv","version":3}},"canonical_sha256":"f1fa3aec0b202a70c09e3546780bed9c10cf8d8908bfea5e8126dda6417014f4","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"f1fa3aec0b202a70c09e3546780bed9c10cf8d8908bfea5e8126dda6417014f4","first_computed_at":"2026-05-18T01:16:09.965311Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:16:09.965311Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"K/gKJrw+0OCx3mzTHx2y+eFMjGeL2xW0+X3vPl5dnHaCrz0/KNDT7CAHzfdmdbJ2+bsy/RDhT/pCBAQDVTsYCw==","signature_status":"signed_v1","signed_at":"2026-05-18T01:16:09.965852Z","signed_message":"canonical_sha256_bytes"},"source_id":"1411.5154","source_kind":"arxiv","source_version":3}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:331a8d861d120a821ba95c38b8339275a523c524d3aab2d4777a88adbe418b95","sha256:fd65bfe27414b953dd8ea370fbe89e6c98662594f38e0cfa2d78c3cd014c312a"],"state_sha256":"2b4469a2e4c7bd70a7d04720ccb7ebe1458501d2f4b38f12f6d4727ddadcacf5"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"FRP/18W6vyAVnJ/8PiB5fKUBVY4tNOmDB87HKiCFkgMvypZILwzceTq4UvgHJCSPA4TQWR1I3DxrsydXhzFBCw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-20T21:16:20.111019Z","bundle_sha256":"b3fab757c7887280f5a93a09f2b67e5bc4b89379888634f7f864ba49f5062e63"}}