{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2009:C7WBNY3TN4MJUBZKKHGQMPEJLP","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":"8dad59d27368eec4f903e367c290e9959c63afa7ca273ce4ec042db73e2378e4","cross_cats_sorted":["gr-qc"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2009-05-12T19:18:24Z","title_canon_sha256":"9cf9812848ef07123a345ebe0303a84f86599f0e6f0e4be1f3a14a3a3b4484f7"},"schema_version":"1.0","source":{"id":"0905.1941","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"0905.1941","created_at":"2026-05-18T00:05:40Z"},{"alias_kind":"arxiv_version","alias_value":"0905.1941v1","created_at":"2026-05-18T00:05:40Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.0905.1941","created_at":"2026-05-18T00:05:40Z"},{"alias_kind":"pith_short_12","alias_value":"C7WBNY3TN4MJ","created_at":"2026-05-18T12:25:58Z"},{"alias_kind":"pith_short_16","alias_value":"C7WBNY3TN4MJUBZK","created_at":"2026-05-18T12:25:58Z"},{"alias_kind":"pith_short_8","alias_value":"C7WBNY3T","created_at":"2026-05-18T12:25:58Z"}],"graph_snapshots":[{"event_id":"sha256:dd781344787e4235b933800e9eac7b20821eaf0bf13079877b123d5c61e8a3a4","target":"graph","created_at":"2026-05-18T00:05:40Z","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":"Several authors have argued that self-consistent $f(R)$ gravity models distinct from $\\Lambda $CDM are almost ruled out. Confronting such claims, we present a particular two-parameter $f(R)$ model that: (a) is cosmologically viable and distinguishable from $\\Lambda $CDM; (b) is compatible with the existence of relativistic stars; (c) is free of singularities of the Ricci scalar during the cosmological evolution and (d) allows the addition of high curvature corrections that could be relevant for inflation.","authors_text":"Ioav Waga, Miguel Quartin, Sergio E. Joras, V Miranda","cross_cats":["gr-qc"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2009-05-12T19:18:24Z","title":"Viable Singularity-Free f(R) Gravity Without a Cosmological Constant"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0905.1941","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":"sha256:4554c7bd6a9618168ea17a5cd44f1ba4c3963ab56838cd58c8f5e4b65f404826","target":"record","created_at":"2026-05-18T00:05:40Z","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":"8dad59d27368eec4f903e367c290e9959c63afa7ca273ce4ec042db73e2378e4","cross_cats_sorted":["gr-qc"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2009-05-12T19:18:24Z","title_canon_sha256":"9cf9812848ef07123a345ebe0303a84f86599f0e6f0e4be1f3a14a3a3b4484f7"},"schema_version":"1.0","source":{"id":"0905.1941","kind":"arxiv","version":1}},"canonical_sha256":"17ec16e3736f189a072a51cd063c895bed2897a907b6b2bcfdba28e9f19b7c72","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"17ec16e3736f189a072a51cd063c895bed2897a907b6b2bcfdba28e9f19b7c72","first_computed_at":"2026-05-18T00:05:40.197934Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:05:40.197934Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"GY8DzoNm/SQvQO2DJPVVnurDw2Xxhmrw4EEsjQw0ezmDkkJtnaqtS5AwQS+dmhDsSsDPPaI5EGw1K+J4mcxYAA==","signature_status":"signed_v1","signed_at":"2026-05-18T00:05:40.198381Z","signed_message":"canonical_sha256_bytes"},"source_id":"0905.1941","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:4554c7bd6a9618168ea17a5cd44f1ba4c3963ab56838cd58c8f5e4b65f404826","sha256:dd781344787e4235b933800e9eac7b20821eaf0bf13079877b123d5c61e8a3a4"],"state_sha256":"31e0f65345c85d1a11e72f152fd4c9669d1141b4250648e47416c52b57c9f044"}