{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2015:SGFKAE3RKNMJXQ3KROR5SA7KAD","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":"5630ff1ace9d5911d1a774fca4226761ac0a135f0885b6bc22bfbb3260106984","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"gr-qc","submitted_at":"2015-07-30T11:08:19Z","title_canon_sha256":"22d952d8e8737ec36928fb4995aadc49717b41440bdd45f4e286ac6222c7463c"},"schema_version":"1.0","source":{"id":"1507.08453","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1507.08453","created_at":"2026-05-18T01:35:26Z"},{"alias_kind":"arxiv_version","alias_value":"1507.08453v1","created_at":"2026-05-18T01:35:26Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1507.08453","created_at":"2026-05-18T01:35:26Z"},{"alias_kind":"pith_short_12","alias_value":"SGFKAE3RKNMJ","created_at":"2026-05-18T12:29:42Z"},{"alias_kind":"pith_short_16","alias_value":"SGFKAE3RKNMJXQ3K","created_at":"2026-05-18T12:29:42Z"},{"alias_kind":"pith_short_8","alias_value":"SGFKAE3R","created_at":"2026-05-18T12:29:42Z"}],"graph_snapshots":[{"event_id":"sha256:92a7f377df962f5247ef252a49a06fa97fb3cc6d937f41dee9593ba874df4001","target":"graph","created_at":"2026-05-18T01:35:26Z","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":"We consider metric-affine scenarios where a modified gravitational action is sourced by electrovacuum fields in a three dimensional space-time. Such scenarios are supported by the physics of crystalline structures with microscopic defects and, in particular, those that can be effectively treated as bi-dimensional (like graphene). We first study the case of $f(R)$ theories, finding deviations near the center as compared to the solutions of General Relativity. We then consider Born-Infeld gravity, which has raised a lot of interest in the last few years regarding its applications in astrophysics","authors_text":"Cosimo Bambi, D. Rubiera-Garcia, M. Ghasemi-Nodehi","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"gr-qc","submitted_at":"2015-07-30T11:08:19Z","title":"Modified gravity in three dimensional metric-affine scenarios"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1507.08453","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:b2653cd1abfbe48ec438a65b2d5d40cc2b8c1a074eb32258811094df5092eeca","target":"record","created_at":"2026-05-18T01:35:26Z","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":"5630ff1ace9d5911d1a774fca4226761ac0a135f0885b6bc22bfbb3260106984","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"gr-qc","submitted_at":"2015-07-30T11:08:19Z","title_canon_sha256":"22d952d8e8737ec36928fb4995aadc49717b41440bdd45f4e286ac6222c7463c"},"schema_version":"1.0","source":{"id":"1507.08453","kind":"arxiv","version":1}},"canonical_sha256":"918aa0137153589bc36a8ba3d903ea00ef94ea516b0e8b819ca27ab9b22d573c","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"918aa0137153589bc36a8ba3d903ea00ef94ea516b0e8b819ca27ab9b22d573c","first_computed_at":"2026-05-18T01:35:26.433573Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:35:26.433573Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"EUCOalaLxRu+taebrLox0R+QBlw/FbdNZY/VoFfRv3X9OR04iUk8V/Kg+WmTA0YrKhuL3RAxqOVjbsnz0WfSBg==","signature_status":"signed_v1","signed_at":"2026-05-18T01:35:26.434253Z","signed_message":"canonical_sha256_bytes"},"source_id":"1507.08453","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:b2653cd1abfbe48ec438a65b2d5d40cc2b8c1a074eb32258811094df5092eeca","sha256:92a7f377df962f5247ef252a49a06fa97fb3cc6d937f41dee9593ba874df4001"],"state_sha256":"349b3c8e93671bd9ffb6141f0804d9b89a91be65f4be053ea57839e7e9eb6908"}