{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2021:CRB5MCXCGPPEOJTDI3IKZZ5DTY","short_pith_number":"pith:CRB5MCXC","canonical_record":{"source":{"id":"2112.03954","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"hep-th","submitted_at":"2021-12-07T19:24:22Z","cross_cats_sorted":[],"title_canon_sha256":"c4baae935aa29f13112d0db369463f56eb9ee85875a5c4e49b307981b6d160c4","abstract_canon_sha256":"cbf44bb92f3b0607f19fb24acd903d71ec916ee5c1e2ffab7505a891523b6b33"},"schema_version":"1.0"},"canonical_sha256":"1443d60ae233de47266346d0ace7a39e397f657953a2c615d1cb9a45e97deac5","source":{"kind":"arxiv","id":"2112.03954","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2112.03954","created_at":"2026-07-05T05:14:09Z"},{"alias_kind":"arxiv_version","alias_value":"2112.03954v1","created_at":"2026-07-05T05:14:09Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2112.03954","created_at":"2026-07-05T05:14:09Z"},{"alias_kind":"pith_short_12","alias_value":"CRB5MCXCGPPE","created_at":"2026-07-05T05:14:09Z"},{"alias_kind":"pith_short_16","alias_value":"CRB5MCXCGPPEOJTD","created_at":"2026-07-05T05:14:09Z"},{"alias_kind":"pith_short_8","alias_value":"CRB5MCXC","created_at":"2026-07-05T05:14:09Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2021:CRB5MCXCGPPEOJTDI3IKZZ5DTY","target":"record","payload":{"canonical_record":{"source":{"id":"2112.03954","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"hep-th","submitted_at":"2021-12-07T19:24:22Z","cross_cats_sorted":[],"title_canon_sha256":"c4baae935aa29f13112d0db369463f56eb9ee85875a5c4e49b307981b6d160c4","abstract_canon_sha256":"cbf44bb92f3b0607f19fb24acd903d71ec916ee5c1e2ffab7505a891523b6b33"},"schema_version":"1.0"},"canonical_sha256":"1443d60ae233de47266346d0ace7a39e397f657953a2c615d1cb9a45e97deac5","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T05:14:09.636025Z","signature_b64":"lhhmKCrbzP47GQKb/+sFTf0y4oGfpEARz+sgSX+y7z8kiakDRE7lg2a7cJ0XYKw9TdtPJ6I6QGZQug/xgRIhCw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"1443d60ae233de47266346d0ace7a39e397f657953a2c615d1cb9a45e97deac5","last_reissued_at":"2026-07-05T05:14:09.635502Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T05:14:09.635502Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2112.03954","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":"2026-07-05T05:14:09Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"+KwwxKYKvVcdJHCxreySnsVhFp9rlVZPIH+U6zwugBoMtlkhEgUQRJb+nGwEdf9+a8YkK5V6R0h18dcJt71HBw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-08T20:53:59.107001Z"},"content_sha256":"6a6c0ccf64e3a3e4cd34cbde618210c42b6761eeb38e135a342741161b0cdded","schema_version":"1.0","event_id":"sha256:6a6c0ccf64e3a3e4cd34cbde618210c42b6761eeb38e135a342741161b0cdded"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2021:CRB5MCXCGPPEOJTDI3IKZZ5DTY","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Black Holes in Klein Space","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"hep-th","authors_text":"Alfredo Guevara, Andrew Strominger, Erin Crawley, Noah Miller","submitted_at":"2021-12-07T19:24:22Z","abstract_excerpt":"The analytic continuation of the general signature $(1,3)$ Lorentzian Kerr-Taub-NUT black holes to signature $(2,2)$ Kleinian black holes is studied. Their global structure is characterized by a toric Penrose diagram resembling their Lorentzian counterparts. Kleinian black holes are found to be self-dual when their mass and NUT charge are equal for any value of the Kerr rotation parameter $a$. Remarkably, it is shown that the rotation $a$ can be eliminated by a large diffeomorphism; this result also holds in Euclidean signature. The continuation from Lorentzian to Kleinian signature is natural"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2112.03954","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":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/2112.03954/integrity.json","findings":[],"available":true,"detectors_run":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938"},"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":"2026-07-05T05:14:09Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"U+h0CUoEPIrLNA+3gntMeO+gjt1Cde/T2RKU3/pSsjOHmj5rzMm6Rnr4T6aANxf02UUFGRmTDgBk7LxrN3b8CQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-08T20:53:59.107482Z"},"content_sha256":"d43a3ddfa3a721e9ee26288685cb48d467df5684fd4228b70518fbe87d00f3bd","schema_version":"1.0","event_id":"sha256:d43a3ddfa3a721e9ee26288685cb48d467df5684fd4228b70518fbe87d00f3bd"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/CRB5MCXCGPPEOJTDI3IKZZ5DTY/bundle.json","state_url":"https://pith.science/pith/CRB5MCXCGPPEOJTDI3IKZZ5DTY/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/CRB5MCXCGPPEOJTDI3IKZZ5DTY/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":"2026-08-08T20:53:59Z","links":{"resolver":"https://pith.science/pith/CRB5MCXCGPPEOJTDI3IKZZ5DTY","bundle":"https://pith.science/pith/CRB5MCXCGPPEOJTDI3IKZZ5DTY/bundle.json","state":"https://pith.science/pith/CRB5MCXCGPPEOJTDI3IKZZ5DTY/state.json","well_known_bundle":"https://pith.science/.well-known/pith/CRB5MCXCGPPEOJTDI3IKZZ5DTY/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2021:CRB5MCXCGPPEOJTDI3IKZZ5DTY","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":"cbf44bb92f3b0607f19fb24acd903d71ec916ee5c1e2ffab7505a891523b6b33","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"hep-th","submitted_at":"2021-12-07T19:24:22Z","title_canon_sha256":"c4baae935aa29f13112d0db369463f56eb9ee85875a5c4e49b307981b6d160c4"},"schema_version":"1.0","source":{"id":"2112.03954","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2112.03954","created_at":"2026-07-05T05:14:09Z"},{"alias_kind":"arxiv_version","alias_value":"2112.03954v1","created_at":"2026-07-05T05:14:09Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2112.03954","created_at":"2026-07-05T05:14:09Z"},{"alias_kind":"pith_short_12","alias_value":"CRB5MCXCGPPE","created_at":"2026-07-05T05:14:09Z"},{"alias_kind":"pith_short_16","alias_value":"CRB5MCXCGPPEOJTD","created_at":"2026-07-05T05:14:09Z"},{"alias_kind":"pith_short_8","alias_value":"CRB5MCXC","created_at":"2026-07-05T05:14:09Z"}],"graph_snapshots":[{"event_id":"sha256:d43a3ddfa3a721e9ee26288685cb48d467df5684fd4228b70518fbe87d00f3bd","target":"graph","created_at":"2026-07-05T05:14:09Z","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"},"integrity":{"available":true,"clean":true,"detectors_run":[],"endpoint":"/pith/2112.03954/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"The analytic continuation of the general signature $(1,3)$ Lorentzian Kerr-Taub-NUT black holes to signature $(2,2)$ Kleinian black holes is studied. Their global structure is characterized by a toric Penrose diagram resembling their Lorentzian counterparts. Kleinian black holes are found to be self-dual when their mass and NUT charge are equal for any value of the Kerr rotation parameter $a$. Remarkably, it is shown that the rotation $a$ can be eliminated by a large diffeomorphism; this result also holds in Euclidean signature. The continuation from Lorentzian to Kleinian signature is natural","authors_text":"Alfredo Guevara, Andrew Strominger, Erin Crawley, Noah Miller","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"hep-th","submitted_at":"2021-12-07T19:24:22Z","title":"Black Holes in Klein Space"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2112.03954","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":"sha256:6a6c0ccf64e3a3e4cd34cbde618210c42b6761eeb38e135a342741161b0cdded","target":"record","created_at":"2026-07-05T05:14:09Z","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":"cbf44bb92f3b0607f19fb24acd903d71ec916ee5c1e2ffab7505a891523b6b33","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"hep-th","submitted_at":"2021-12-07T19:24:22Z","title_canon_sha256":"c4baae935aa29f13112d0db369463f56eb9ee85875a5c4e49b307981b6d160c4"},"schema_version":"1.0","source":{"id":"2112.03954","kind":"arxiv","version":1}},"canonical_sha256":"1443d60ae233de47266346d0ace7a39e397f657953a2c615d1cb9a45e97deac5","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"1443d60ae233de47266346d0ace7a39e397f657953a2c615d1cb9a45e97deac5","first_computed_at":"2026-07-05T05:14:09.635502Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T05:14:09.635502Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"lhhmKCrbzP47GQKb/+sFTf0y4oGfpEARz+sgSX+y7z8kiakDRE7lg2a7cJ0XYKw9TdtPJ6I6QGZQug/xgRIhCw==","signature_status":"signed_v1","signed_at":"2026-07-05T05:14:09.636025Z","signed_message":"canonical_sha256_bytes"},"source_id":"2112.03954","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:6a6c0ccf64e3a3e4cd34cbde618210c42b6761eeb38e135a342741161b0cdded","sha256:d43a3ddfa3a721e9ee26288685cb48d467df5684fd4228b70518fbe87d00f3bd"],"state_sha256":"07ff7715e5758b4c714a32b1ce4ee3d56cb3bb02b5ddf7edb944e98cd3810edb"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"z+pw/6x9z2ra7Kwneue1NtR4dtyYmz0+QBbIGoZ71KrjdFzMBodEpwuEE8KjK26sxtQ227v0cQFRiQzUZRbmDg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-08T20:53:59.110650Z","bundle_sha256":"e596f4e018bf9f1585805e7c7f13d7f2fe71f2da1ea4ec272a35a491b09d8106"}}