{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2013:SLCK6AKRJAK7SDW4MCC6LK2WNM","short_pith_number":"pith:SLCK6AKR","canonical_record":{"source":{"id":"1306.4750","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"gr-qc","submitted_at":"2013-06-20T04:03:38Z","cross_cats_sorted":[],"title_canon_sha256":"f8d7819b8a056e348c2666e4767271831607cff77f8678778a2537a52f40ae7d","abstract_canon_sha256":"26a1d0d3f022d7255b95c7c59542de59db599b10929fd0620b8ef24e79e87633"},"schema_version":"1.0"},"canonical_sha256":"92c4af01514815f90edc6085e5ab566b1ef31857e8a5caf3c46da950dcae6e55","source":{"kind":"arxiv","id":"1306.4750","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1306.4750","created_at":"2026-05-18T01:49:14Z"},{"alias_kind":"arxiv_version","alias_value":"1306.4750v2","created_at":"2026-05-18T01:49:14Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1306.4750","created_at":"2026-05-18T01:49:14Z"},{"alias_kind":"pith_short_12","alias_value":"SLCK6AKRJAK7","created_at":"2026-05-18T12:27:59Z"},{"alias_kind":"pith_short_16","alias_value":"SLCK6AKRJAK7SDW4","created_at":"2026-05-18T12:27:59Z"},{"alias_kind":"pith_short_8","alias_value":"SLCK6AKR","created_at":"2026-05-18T12:27:59Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2013:SLCK6AKRJAK7SDW4MCC6LK2WNM","target":"record","payload":{"canonical_record":{"source":{"id":"1306.4750","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"gr-qc","submitted_at":"2013-06-20T04:03:38Z","cross_cats_sorted":[],"title_canon_sha256":"f8d7819b8a056e348c2666e4767271831607cff77f8678778a2537a52f40ae7d","abstract_canon_sha256":"26a1d0d3f022d7255b95c7c59542de59db599b10929fd0620b8ef24e79e87633"},"schema_version":"1.0"},"canonical_sha256":"92c4af01514815f90edc6085e5ab566b1ef31857e8a5caf3c46da950dcae6e55","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:49:14.531576Z","signature_b64":"fYFvYS9aBA/0AFO6hp+bS4zzY44OJiKa5tk7A2oft0q+ze9xtJBL+dwZxodW+D/GQ/XfJujOvl0dUw3yk+RXAQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"92c4af01514815f90edc6085e5ab566b1ef31857e8a5caf3c46da950dcae6e55","last_reissued_at":"2026-05-18T01:49:14.530986Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:49:14.530986Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1306.4750","source_version":2,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T01:49:14Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"WxYSA8hcElf2b6J1g4XVRSulooyval48AenlB5RkzRNpY524cwXgbKGvNm1UQRjjoj9RgFXo01L2sAgLY/xgCQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-01T13:47:22.314783Z"},"content_sha256":"c12534d4ebe35d9fae77de4dcad0d234634d695a01690f71053532b2d032666d","schema_version":"1.0","event_id":"sha256:c12534d4ebe35d9fae77de4dcad0d234634d695a01690f71053532b2d032666d"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2013:SLCK6AKRJAK7SDW4MCC6LK2WNM","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Looking for empty topological wormhole spacetimes in $F(R)$-modified gravity","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"gr-qc","authors_text":"L. Sebastiani, R. Di Criscienzo, R. Myrzakulov","submitted_at":"2013-06-20T04:03:38Z","abstract_excerpt":"Much attention has been recently devoted to modified theories of gravity in the attempt to efficiently describe both early inflation and late-time acceleration of our universe without referring to the cosmological constant or other ad hoc kinds of fluids. The simplest models overcome General Relativity simply by replacing $R$ with $F(R)$ in the Einstein--Hilbert action. Unfortunately, such models typically lack most of the beautiful solutions discovered in Einstein's gravity. Nonetheless, in $F(R)$ gravity, it has been possible to get at least few black holes, but still we do not know any empt"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1306.4750","kind":"arxiv","version":2},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"references":{"count":0,"sample":[],"resolved_work":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","internal_anchors":0},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"author_claims":{"count":0,"strong_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"builder_version":"pith-number-builder-2026-05-17-v1"},"verdict_id":null},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T01:49:14Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"LIfRg2EiMPc33tdOGeHJBpGgWvnlDtIJjxV+zKoNHDCgM54kK679kptDL+8UXnpUkPruBFJlj4T40Y2djBElBg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-01T13:47:22.315126Z"},"content_sha256":"cc88e68a6e5c87f2f69dfdbfa3e6655f2dcdf51e9bfef303c10b86e743923ec7","schema_version":"1.0","event_id":"sha256:cc88e68a6e5c87f2f69dfdbfa3e6655f2dcdf51e9bfef303c10b86e743923ec7"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/SLCK6AKRJAK7SDW4MCC6LK2WNM/bundle.json","state_url":"https://pith.science/pith/SLCK6AKRJAK7SDW4MCC6LK2WNM/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/SLCK6AKRJAK7SDW4MCC6LK2WNM/bundle.json","status":"primary"}],"public_keys":[{"key_id":"pith-v1-2026-05","algorithm":"ed25519","format":"raw","public_key_b64":"stVStoiQhXFxp4s2pdzPNoqVNBMojDU/fJ2db5S3CbM=","public_key_hex":"b2d552b68890857171a78b36a5dccf368a953413288c353f7c9d9d6f94b709b3","fingerprint_sha256_b32_first128bits":"RVFV5Z2OI2J3ZUO7ERDEBCYNKS","fingerprint_sha256_hex":"8d4b5ee74e4693bcd1df2446408b0d54","rotates_at":null,"url":"https://pith.science/pith-signing-key.json","notes":"Pith uses this Ed25519 key to sign canonical record SHA-256 digests. Verify with: ed25519_verify(public_key, message=canonical_sha256_bytes, signature=base64decode(signature_b64))."}],"merge_version":"pith-open-graph-merge-v1","built_at":"2026-06-01T13:47:22Z","links":{"resolver":"https://pith.science/pith/SLCK6AKRJAK7SDW4MCC6LK2WNM","bundle":"https://pith.science/pith/SLCK6AKRJAK7SDW4MCC6LK2WNM/bundle.json","state":"https://pith.science/pith/SLCK6AKRJAK7SDW4MCC6LK2WNM/state.json","well_known_bundle":"https://pith.science/.well-known/pith/SLCK6AKRJAK7SDW4MCC6LK2WNM/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2013:SLCK6AKRJAK7SDW4MCC6LK2WNM","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":"26a1d0d3f022d7255b95c7c59542de59db599b10929fd0620b8ef24e79e87633","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"gr-qc","submitted_at":"2013-06-20T04:03:38Z","title_canon_sha256":"f8d7819b8a056e348c2666e4767271831607cff77f8678778a2537a52f40ae7d"},"schema_version":"1.0","source":{"id":"1306.4750","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1306.4750","created_at":"2026-05-18T01:49:14Z"},{"alias_kind":"arxiv_version","alias_value":"1306.4750v2","created_at":"2026-05-18T01:49:14Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1306.4750","created_at":"2026-05-18T01:49:14Z"},{"alias_kind":"pith_short_12","alias_value":"SLCK6AKRJAK7","created_at":"2026-05-18T12:27:59Z"},{"alias_kind":"pith_short_16","alias_value":"SLCK6AKRJAK7SDW4","created_at":"2026-05-18T12:27:59Z"},{"alias_kind":"pith_short_8","alias_value":"SLCK6AKR","created_at":"2026-05-18T12:27:59Z"}],"graph_snapshots":[{"event_id":"sha256:cc88e68a6e5c87f2f69dfdbfa3e6655f2dcdf51e9bfef303c10b86e743923ec7","target":"graph","created_at":"2026-05-18T01:49:14Z","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":"Much attention has been recently devoted to modified theories of gravity in the attempt to efficiently describe both early inflation and late-time acceleration of our universe without referring to the cosmological constant or other ad hoc kinds of fluids. The simplest models overcome General Relativity simply by replacing $R$ with $F(R)$ in the Einstein--Hilbert action. Unfortunately, such models typically lack most of the beautiful solutions discovered in Einstein's gravity. Nonetheless, in $F(R)$ gravity, it has been possible to get at least few black holes, but still we do not know any empt","authors_text":"L. Sebastiani, R. Di Criscienzo, R. Myrzakulov","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"gr-qc","submitted_at":"2013-06-20T04:03:38Z","title":"Looking for empty topological wormhole spacetimes in $F(R)$-modified gravity"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1306.4750","kind":"arxiv","version":2},"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:c12534d4ebe35d9fae77de4dcad0d234634d695a01690f71053532b2d032666d","target":"record","created_at":"2026-05-18T01:49:14Z","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":"26a1d0d3f022d7255b95c7c59542de59db599b10929fd0620b8ef24e79e87633","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"gr-qc","submitted_at":"2013-06-20T04:03:38Z","title_canon_sha256":"f8d7819b8a056e348c2666e4767271831607cff77f8678778a2537a52f40ae7d"},"schema_version":"1.0","source":{"id":"1306.4750","kind":"arxiv","version":2}},"canonical_sha256":"92c4af01514815f90edc6085e5ab566b1ef31857e8a5caf3c46da950dcae6e55","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"92c4af01514815f90edc6085e5ab566b1ef31857e8a5caf3c46da950dcae6e55","first_computed_at":"2026-05-18T01:49:14.530986Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:49:14.530986Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"fYFvYS9aBA/0AFO6hp+bS4zzY44OJiKa5tk7A2oft0q+ze9xtJBL+dwZxodW+D/GQ/XfJujOvl0dUw3yk+RXAQ==","signature_status":"signed_v1","signed_at":"2026-05-18T01:49:14.531576Z","signed_message":"canonical_sha256_bytes"},"source_id":"1306.4750","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:c12534d4ebe35d9fae77de4dcad0d234634d695a01690f71053532b2d032666d","sha256:cc88e68a6e5c87f2f69dfdbfa3e6655f2dcdf51e9bfef303c10b86e743923ec7"],"state_sha256":"f4ffa4239bfc78e1efc411d8199c909274324742cbf0b22885cbd34e4f92eef0"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"ya9V26w5gCHxEJuaD0wWiqQT0iET3AeSRgrFfRnxg0CN/zZ7F/mwp0EwH50e/jwktc6ggS1Ml4LKt65Fx+IDBQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-01T13:47:22.317022Z","bundle_sha256":"579359007243940bfbf0cb27ee5b5fca0f3b9247abbec490b04d7723325c239b"}}