{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2017:IPPHRAZVJXBV62MUN2GYO6GH6K","short_pith_number":"pith:IPPHRAZV","canonical_record":{"source":{"id":"1801.00307","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"gr-qc","submitted_at":"2017-12-31T15:57:10Z","cross_cats_sorted":["hep-th"],"title_canon_sha256":"d87d4be205eaecee599e4090a0189f4730e582d4cfdd9aa8153c0b2d1bc8d8bf","abstract_canon_sha256":"a63d658ac70ec85da07ff2747a64e93a188f7967cddf4368fb6f6cfe98e17535"},"schema_version":"1.0"},"canonical_sha256":"43de7883354dc35f69946e8d8778c7f28f0642c83ec28391d4abccb808836c10","source":{"kind":"arxiv","id":"1801.00307","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1801.00307","created_at":"2026-05-18T00:26:58Z"},{"alias_kind":"arxiv_version","alias_value":"1801.00307v1","created_at":"2026-05-18T00:26:58Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1801.00307","created_at":"2026-05-18T00:26:58Z"},{"alias_kind":"pith_short_12","alias_value":"IPPHRAZVJXBV","created_at":"2026-05-18T12:31:21Z"},{"alias_kind":"pith_short_16","alias_value":"IPPHRAZVJXBV62MU","created_at":"2026-05-18T12:31:21Z"},{"alias_kind":"pith_short_8","alias_value":"IPPHRAZV","created_at":"2026-05-18T12:31:21Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2017:IPPHRAZVJXBV62MUN2GYO6GH6K","target":"record","payload":{"canonical_record":{"source":{"id":"1801.00307","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"gr-qc","submitted_at":"2017-12-31T15:57:10Z","cross_cats_sorted":["hep-th"],"title_canon_sha256":"d87d4be205eaecee599e4090a0189f4730e582d4cfdd9aa8153c0b2d1bc8d8bf","abstract_canon_sha256":"a63d658ac70ec85da07ff2747a64e93a188f7967cddf4368fb6f6cfe98e17535"},"schema_version":"1.0"},"canonical_sha256":"43de7883354dc35f69946e8d8778c7f28f0642c83ec28391d4abccb808836c10","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T00:26:58.739415Z","signature_b64":"mlH1BOSVPf1abxhul4xWvvzoGH9pVHEWJE5uTVH8mlXVzdy5dV8k8WT7JCAbJvWIrJ/QOFsNpSEW5kDcb3BoCQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"43de7883354dc35f69946e8d8778c7f28f0642c83ec28391d4abccb808836c10","last_reissued_at":"2026-05-18T00:26:58.738745Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T00:26:58.738745Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1801.00307","source_version":1,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T00:26:58Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"rrhRgNbweDgcQzNOoOfnNLm9NdeuYjvObvs5oVgUOYFNpbmIDf0SbAwnMyWLLSrPIDRxuAah5iTwHnbUW+KyAw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-28T14:33:30.859209Z"},"content_sha256":"72cc89adb8d828811bfa4bf050bc1d150cc641d8fed9f0eb6ad056dddeed0aaf","schema_version":"1.0","event_id":"sha256:72cc89adb8d828811bfa4bf050bc1d150cc641d8fed9f0eb6ad056dddeed0aaf"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2017:IPPHRAZVJXBV62MUN2GYO6GH6K","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Kundt spacetimes in the Gauss-Bonnet Gravity","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["hep-th"],"primary_cat":"gr-qc","authors_text":"Jiri Podolsky, Ondrej Hruska","submitted_at":"2017-12-31T15:57:10Z","abstract_excerpt":"The Gauss-Bonnet gravity is a special case of so-called Quadratic Gravity, which is an extension of Einstein's theory with additional terms in action that are quadratic combinations of the Riemann tensor and its contractions. These corrections are needed, for example, in perturbative quantum gravity. We consider the family of Kundt spacetimes, which is defined in a purely geometrical way by admitting a shear-free, twist-free and expansion-free null geodesic congruence. In particular, we focus on the Kundt solutions without gyratonic terms, and we investigate the constraints imposed by the Eins"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1801.00307","kind":"arxiv","version":1},"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":"2026-05-18T00:26:58Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"D5sw94kB9/+pM0eTS55wxayotJQKDLt5Mc1DjgvWelso13S8D+4G9G5CtRPOXfHoD65y2CIBpYou1neLxONJDQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-28T14:33:30.859587Z"},"content_sha256":"e34716d17becf3b63e35b986176ffe695dfc4c474d69f0902ccaa5e7ac4fa1ea","schema_version":"1.0","event_id":"sha256:e34716d17becf3b63e35b986176ffe695dfc4c474d69f0902ccaa5e7ac4fa1ea"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/IPPHRAZVJXBV62MUN2GYO6GH6K/bundle.json","state_url":"https://pith.science/pith/IPPHRAZVJXBV62MUN2GYO6GH6K/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/IPPHRAZVJXBV62MUN2GYO6GH6K/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":"2026-05-28T14:33:30Z","links":{"resolver":"https://pith.science/pith/IPPHRAZVJXBV62MUN2GYO6GH6K","bundle":"https://pith.science/pith/IPPHRAZVJXBV62MUN2GYO6GH6K/bundle.json","state":"https://pith.science/pith/IPPHRAZVJXBV62MUN2GYO6GH6K/state.json","well_known_bundle":"https://pith.science/.well-known/pith/IPPHRAZVJXBV62MUN2GYO6GH6K/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2017:IPPHRAZVJXBV62MUN2GYO6GH6K","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":"a63d658ac70ec85da07ff2747a64e93a188f7967cddf4368fb6f6cfe98e17535","cross_cats_sorted":["hep-th"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"gr-qc","submitted_at":"2017-12-31T15:57:10Z","title_canon_sha256":"d87d4be205eaecee599e4090a0189f4730e582d4cfdd9aa8153c0b2d1bc8d8bf"},"schema_version":"1.0","source":{"id":"1801.00307","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1801.00307","created_at":"2026-05-18T00:26:58Z"},{"alias_kind":"arxiv_version","alias_value":"1801.00307v1","created_at":"2026-05-18T00:26:58Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1801.00307","created_at":"2026-05-18T00:26:58Z"},{"alias_kind":"pith_short_12","alias_value":"IPPHRAZVJXBV","created_at":"2026-05-18T12:31:21Z"},{"alias_kind":"pith_short_16","alias_value":"IPPHRAZVJXBV62MU","created_at":"2026-05-18T12:31:21Z"},{"alias_kind":"pith_short_8","alias_value":"IPPHRAZV","created_at":"2026-05-18T12:31:21Z"}],"graph_snapshots":[{"event_id":"sha256:e34716d17becf3b63e35b986176ffe695dfc4c474d69f0902ccaa5e7ac4fa1ea","target":"graph","created_at":"2026-05-18T00:26:58Z","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":"The Gauss-Bonnet gravity is a special case of so-called Quadratic Gravity, which is an extension of Einstein's theory with additional terms in action that are quadratic combinations of the Riemann tensor and its contractions. These corrections are needed, for example, in perturbative quantum gravity. We consider the family of Kundt spacetimes, which is defined in a purely geometrical way by admitting a shear-free, twist-free and expansion-free null geodesic congruence. In particular, we focus on the Kundt solutions without gyratonic terms, and we investigate the constraints imposed by the Eins","authors_text":"Jiri Podolsky, Ondrej Hruska","cross_cats":["hep-th"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"gr-qc","submitted_at":"2017-12-31T15:57:10Z","title":"Kundt spacetimes in the Gauss-Bonnet Gravity"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1801.00307","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":"sha256:72cc89adb8d828811bfa4bf050bc1d150cc641d8fed9f0eb6ad056dddeed0aaf","target":"record","created_at":"2026-05-18T00:26:58Z","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":"a63d658ac70ec85da07ff2747a64e93a188f7967cddf4368fb6f6cfe98e17535","cross_cats_sorted":["hep-th"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"gr-qc","submitted_at":"2017-12-31T15:57:10Z","title_canon_sha256":"d87d4be205eaecee599e4090a0189f4730e582d4cfdd9aa8153c0b2d1bc8d8bf"},"schema_version":"1.0","source":{"id":"1801.00307","kind":"arxiv","version":1}},"canonical_sha256":"43de7883354dc35f69946e8d8778c7f28f0642c83ec28391d4abccb808836c10","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"43de7883354dc35f69946e8d8778c7f28f0642c83ec28391d4abccb808836c10","first_computed_at":"2026-05-18T00:26:58.738745Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:26:58.738745Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"mlH1BOSVPf1abxhul4xWvvzoGH9pVHEWJE5uTVH8mlXVzdy5dV8k8WT7JCAbJvWIrJ/QOFsNpSEW5kDcb3BoCQ==","signature_status":"signed_v1","signed_at":"2026-05-18T00:26:58.739415Z","signed_message":"canonical_sha256_bytes"},"source_id":"1801.00307","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:72cc89adb8d828811bfa4bf050bc1d150cc641d8fed9f0eb6ad056dddeed0aaf","sha256:e34716d17becf3b63e35b986176ffe695dfc4c474d69f0902ccaa5e7ac4fa1ea"],"state_sha256":"babbfd39017171d613a9229ad313e583d7679d228c4e1367f4542daa75440c73"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"l2LOZiKJvxINDeY2jzojWppFbzQ35e3LUHm59SFpaJNtjyzTgs5j7hZyA6/OHnrfb4j9noFpE1eeGnlw24nwDA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-28T14:33:30.861680Z","bundle_sha256":"8fe94f9d12d29e9d8328c393b4a8396f30ed663d68706b35e96be92d440fde4e"}}