{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2014:LFIUHGJQQAT2AB4J32XB2A7LLI","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":"954440b20c88a32aca61adeedda46cf461cb16e70aca8f337757ef81042a2351","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"gr-qc","submitted_at":"2014-06-25T00:23:30Z","title_canon_sha256":"5c38e4658141d52116676dd3b5bacc966f411aff68a3677023b2a0ad03356ba4"},"schema_version":"1.0","source":{"id":"1406.6422","kind":"arxiv","version":3}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1406.6422","created_at":"2026-05-18T00:50:23Z"},{"alias_kind":"arxiv_version","alias_value":"1406.6422v3","created_at":"2026-05-18T00:50:23Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1406.6422","created_at":"2026-05-18T00:50:23Z"},{"alias_kind":"pith_short_12","alias_value":"LFIUHGJQQAT2","created_at":"2026-05-18T12:28:38Z"},{"alias_kind":"pith_short_16","alias_value":"LFIUHGJQQAT2AB4J","created_at":"2026-05-18T12:28:38Z"},{"alias_kind":"pith_short_8","alias_value":"LFIUHGJQ","created_at":"2026-05-18T12:28:38Z"}],"graph_snapshots":[{"event_id":"sha256:3f43be1fb6b76ef5d344bf26f234af633580d47c43ea23ecf156c079d5f745e3","target":"graph","created_at":"2026-05-18T00:50:23Z","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":"In this work we explore the viability of nonminimally coupled matter- curvature gravity theories, namely the conditions required for the absence of tachyon instabilities and ghost degrees of freedom. We contrast our finds with recent claims of a pathological behaviour of this class of models, which resorted to, in our view, an incorrect analogy with k-essence.","authors_text":"Jorge P\\'aramos, Orfeu Bertolami","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"gr-qc","submitted_at":"2014-06-25T00:23:30Z","title":"Viability of nonminimally coupled f (R) gravity"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1406.6422","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:a9b736585317e89d27abaa95fc27fd65bfa7af14a46bae2c869cad7143596bc4","target":"record","created_at":"2026-05-18T00:50:23Z","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":"954440b20c88a32aca61adeedda46cf461cb16e70aca8f337757ef81042a2351","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"gr-qc","submitted_at":"2014-06-25T00:23:30Z","title_canon_sha256":"5c38e4658141d52116676dd3b5bacc966f411aff68a3677023b2a0ad03356ba4"},"schema_version":"1.0","source":{"id":"1406.6422","kind":"arxiv","version":3}},"canonical_sha256":"59514399308027a00789deae1d03eb5a086cbdb68b2650a89c65a3324857d167","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"59514399308027a00789deae1d03eb5a086cbdb68b2650a89c65a3324857d167","first_computed_at":"2026-05-18T00:50:23.509815Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:50:23.509815Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"oCNAN++dvYHbIQeRjl4P29wvm55ivO3lAnJqrcGwRBF+BG5UgmT+1tCK5dCfYQjrFgfKSVMSABbnLwLTT7YrCQ==","signature_status":"signed_v1","signed_at":"2026-05-18T00:50:23.510520Z","signed_message":"canonical_sha256_bytes"},"source_id":"1406.6422","source_kind":"arxiv","source_version":3}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:a9b736585317e89d27abaa95fc27fd65bfa7af14a46bae2c869cad7143596bc4","sha256:3f43be1fb6b76ef5d344bf26f234af633580d47c43ea23ecf156c079d5f745e3"],"state_sha256":"4eddbe4150dc0ba59e5084dc8902e13fdef751b78a380da1423e5244e5315e25"}