{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2008:GUXV4QYJNAPLYGFAGD4LR3PPCW","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":"5d2bd7e0f13c24073f51ded90ea4cb9cc5259aba5cfbde8ad16155db0b1c6dbf","cross_cats_sorted":["math-ph","math.MP"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"gr-qc","submitted_at":"2008-12-07T13:17:31Z","title_canon_sha256":"9736013b3f58addba6efe5477b99475e564d96cf73f39003ea7445843cc358a6"},"schema_version":"1.0","source":{"id":"0812.1344","kind":"arxiv","version":3}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"0812.1344","created_at":"2026-05-18T04:21:21Z"},{"alias_kind":"arxiv_version","alias_value":"0812.1344v3","created_at":"2026-05-18T04:21:21Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.0812.1344","created_at":"2026-05-18T04:21:21Z"},{"alias_kind":"pith_short_12","alias_value":"GUXV4QYJNAPL","created_at":"2026-05-18T12:25:57Z"},{"alias_kind":"pith_short_16","alias_value":"GUXV4QYJNAPLYGFA","created_at":"2026-05-18T12:25:57Z"},{"alias_kind":"pith_short_8","alias_value":"GUXV4QYJ","created_at":"2026-05-18T12:25:57Z"}],"graph_snapshots":[{"event_id":"sha256:6175ee1c3770249211a8df8c0f7c35d1dbdb4adf3383ed16398a2575ada0f508","target":"graph","created_at":"2026-05-18T04:21:21Z","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":"It is shown that modified gravity theories with a Lagrangian composed of the three quadratic invariants of the Riemann curvature tensor are not appropriate. The field equations are either incompatible and/or irregular [like f(R)-gravities], or, if compatible, lead to the linear instability of polarizations relating to the Weyl tensor.\n  A more relevant modification is the frame field theory, namely the best and unique variant of Absolute Parallelism; it has no free parameters (D=5 is a must) and no singularities arising in solutions. I sketch few remarkable features of this theory.","authors_text":"I.L. Zhogin","cross_cats":["math-ph","math.MP"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"gr-qc","submitted_at":"2008-12-07T13:17:31Z","title":"On relevance of modified gravities"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0812.1344","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":"sha256:10f6960a8296f0acb1a09c6a6156125c8a2a6cd9de00cc9d2da576c7623ddf78","target":"record","created_at":"2026-05-18T04:21:21Z","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":"5d2bd7e0f13c24073f51ded90ea4cb9cc5259aba5cfbde8ad16155db0b1c6dbf","cross_cats_sorted":["math-ph","math.MP"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"gr-qc","submitted_at":"2008-12-07T13:17:31Z","title_canon_sha256":"9736013b3f58addba6efe5477b99475e564d96cf73f39003ea7445843cc358a6"},"schema_version":"1.0","source":{"id":"0812.1344","kind":"arxiv","version":3}},"canonical_sha256":"352f5e4309681ebc18a030f8b8edef159e11d5cecfe2d178e5208782587d5b1c","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"352f5e4309681ebc18a030f8b8edef159e11d5cecfe2d178e5208782587d5b1c","first_computed_at":"2026-05-18T04:21:21.597768Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T04:21:21.597768Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"Vz4/42B3UpMh7Hl/84apnWPNM27harnUjCzpZAXeh5E62xBg9YZMKLqN+9F5wCf1fcHTaNVa/lus1V1hjdIdDA==","signature_status":"signed_v1","signed_at":"2026-05-18T04:21:21.598190Z","signed_message":"canonical_sha256_bytes"},"source_id":"0812.1344","source_kind":"arxiv","source_version":3}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:10f6960a8296f0acb1a09c6a6156125c8a2a6cd9de00cc9d2da576c7623ddf78","sha256:6175ee1c3770249211a8df8c0f7c35d1dbdb4adf3383ed16398a2575ada0f508"],"state_sha256":"a8cdda29bf2c31aa9066ca25f256e023fdb42788d5522dad2739c5cc06c58eea"}