{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2011:JGD2QN7P6HPABF47NSZD55TXV4","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":"0dfb9a12b58b9d46eb811997e2f722e57836f5052017503edf3bce4c1de96570","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"gr-qc","submitted_at":"2011-08-14T20:20:09Z","title_canon_sha256":"50ee96c27ce15ef3012c5c801625796a8dc68a6b2245e9cb7983e576416191d2"},"schema_version":"1.0","source":{"id":"1108.2900","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1108.2900","created_at":"2026-05-18T02:21:37Z"},{"alias_kind":"arxiv_version","alias_value":"1108.2900v2","created_at":"2026-05-18T02:21:37Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1108.2900","created_at":"2026-05-18T02:21:37Z"},{"alias_kind":"pith_short_12","alias_value":"JGD2QN7P6HPA","created_at":"2026-05-18T12:26:32Z"},{"alias_kind":"pith_short_16","alias_value":"JGD2QN7P6HPABF47","created_at":"2026-05-18T12:26:32Z"},{"alias_kind":"pith_short_8","alias_value":"JGD2QN7P","created_at":"2026-05-18T12:26:32Z"}],"graph_snapshots":[{"event_id":"sha256:7fda6823f710d408c810968bcb20bdb8ae16bc106aab3a45758a67f7eefb7956","target":"graph","created_at":"2026-05-18T02:21:37Z","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":"Recently it was shown that if the matter congruence of a general relativistic perfect fluid flow in an almost FLRW universe is shear-free, then it must be either expansion or rotation-free. Here we generalize this result for a general f(R) theory of gravity and show there exist scenarios where this result can be avoided. This suggests that there are situations where linearized forth-order gravity shares properties with Newtonian theory not valid in General Relativity.","authors_text":"Amare Abebe, Peter K. S. Dunsby, Rituparno Goswami","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"gr-qc","submitted_at":"2011-08-14T20:20:09Z","title":"On Shear-free perturbations of f(R) gravity"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1108.2900","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":"sha256:6917419a954f0560bb9ee82b8454b8e67412c430371e3881e659ebce1bc62b0f","target":"record","created_at":"2026-05-18T02:21:37Z","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":"0dfb9a12b58b9d46eb811997e2f722e57836f5052017503edf3bce4c1de96570","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"gr-qc","submitted_at":"2011-08-14T20:20:09Z","title_canon_sha256":"50ee96c27ce15ef3012c5c801625796a8dc68a6b2245e9cb7983e576416191d2"},"schema_version":"1.0","source":{"id":"1108.2900","kind":"arxiv","version":2}},"canonical_sha256":"4987a837eff1de00979f6cb23ef677af3bb8ebee219730515263db1f3623cb71","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"4987a837eff1de00979f6cb23ef677af3bb8ebee219730515263db1f3623cb71","first_computed_at":"2026-05-18T02:21:37.227546Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T02:21:37.227546Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"ubht5Xj9tiWPY8aaSO6QwmVLQBy+mCQzTgQptfWHv8iPtGd7Lk89BJ/Qmxjv6SXurE9NLytOL8TYvWug+9twAA==","signature_status":"signed_v1","signed_at":"2026-05-18T02:21:37.228069Z","signed_message":"canonical_sha256_bytes"},"source_id":"1108.2900","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:6917419a954f0560bb9ee82b8454b8e67412c430371e3881e659ebce1bc62b0f","sha256:7fda6823f710d408c810968bcb20bdb8ae16bc106aab3a45758a67f7eefb7956"],"state_sha256":"c833167f592cfaa5bef362e81afb45716023521bc182ec7e54552bbec0fa2fc6"}