{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2018:YI2X3TW4DT2UQLK7F3VCADOK3R","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":"ce3d2aa80fda9f0c89f08710ed37643dbd6151e9759caf1df2f69d1b9fd212fb","cross_cats_sorted":["hep-th"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"gr-qc","submitted_at":"2018-12-05T08:29:05Z","title_canon_sha256":"f499f1604614fcf68e856cccd102750933704fed01f93debf3f11f68fd6fbe13"},"schema_version":"1.0","source":{"id":"1812.01854","kind":"arxiv","version":3}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1812.01854","created_at":"2026-05-17T23:58:08Z"},{"alias_kind":"arxiv_version","alias_value":"1812.01854v3","created_at":"2026-05-17T23:58:08Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1812.01854","created_at":"2026-05-17T23:58:08Z"},{"alias_kind":"pith_short_12","alias_value":"YI2X3TW4DT2U","created_at":"2026-05-18T12:33:04Z"},{"alias_kind":"pith_short_16","alias_value":"YI2X3TW4DT2UQLK7","created_at":"2026-05-18T12:33:04Z"},{"alias_kind":"pith_short_8","alias_value":"YI2X3TW4","created_at":"2026-05-18T12:33:04Z"}],"graph_snapshots":[{"event_id":"sha256:77186530da7f8e4fe0926445f1b7519784c239b8a6e55632280141413713588a","target":"graph","created_at":"2026-05-17T23:58:08Z","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":"f(Ricci) gravity is a special kind of higher curvature gravity whose bulk Lagrangian density is the trace of a matrix-valued function of the Ricci tensor. It is shown that, under some mild constraints, f(Ricci) gravity admits Einstein manifolds as exact vacuum solutions, and can be ghost free around maximally symmetric Einstein vacua. It is also shown that the entropy for spherically symmetric black holes in f(Ricci) gravity calculated via Wald's method and the boundary Noether charge approach proposed by Majhi and Padmanabhan are in good agreement.","authors_text":"Chuanyi Wang, Liu Zhao","cross_cats":["hep-th"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"gr-qc","submitted_at":"2018-12-05T08:29:05Z","title":"f(Ricci) gravity"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1812.01854","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":"sha256:654a25d9d2fc84eeafedd6f589d580c47791ec958a8222f68e662e853e15ffa0","target":"record","created_at":"2026-05-17T23:58:08Z","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":"ce3d2aa80fda9f0c89f08710ed37643dbd6151e9759caf1df2f69d1b9fd212fb","cross_cats_sorted":["hep-th"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"gr-qc","submitted_at":"2018-12-05T08:29:05Z","title_canon_sha256":"f499f1604614fcf68e856cccd102750933704fed01f93debf3f11f68fd6fbe13"},"schema_version":"1.0","source":{"id":"1812.01854","kind":"arxiv","version":3}},"canonical_sha256":"c2357dcedc1cf5482d5f2eea200dcadc40d6d3e00c8f8d56db7e16f6a0839936","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"c2357dcedc1cf5482d5f2eea200dcadc40d6d3e00c8f8d56db7e16f6a0839936","first_computed_at":"2026-05-17T23:58:08.333364Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-17T23:58:08.333364Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"gsNohtyY1lB70eysRfT7rMWEj5Zi5+i720Znh+INKpOmguws10YOdvW21RnTD7x2fYBF/n/3oEAwI3klzfs1Bg==","signature_status":"signed_v1","signed_at":"2026-05-17T23:58:08.333990Z","signed_message":"canonical_sha256_bytes"},"source_id":"1812.01854","source_kind":"arxiv","source_version":3}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:654a25d9d2fc84eeafedd6f589d580c47791ec958a8222f68e662e853e15ffa0","sha256:77186530da7f8e4fe0926445f1b7519784c239b8a6e55632280141413713588a"],"state_sha256":"84d3be1ea4bb2c4f1a4a2525d08d571c17abed9547a97ac6757186969b6f895f"}