{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2011:Y4B3IRX5JXHIKT6JBBS6BR7O7F","short_pith_number":"pith:Y4B3IRX5","canonical_record":{"source":{"id":"1107.0763","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"gr-qc","submitted_at":"2011-07-05T01:02:29Z","cross_cats_sorted":[],"title_canon_sha256":"e9ef950324cb4d9f64da8c2a3a6dfdf6ff9716f8c88047ce48bbf7a1887db450","abstract_canon_sha256":"6f582c11b41697de826190943ec04b5ad4bfe8c8ae966977915db4869ee75bf9"},"schema_version":"1.0"},"canonical_sha256":"c703b446fd4dce854fc90865e0c7eef94316b5ee7278cb0346ce4b6d930bd249","source":{"kind":"arxiv","id":"1107.0763","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1107.0763","created_at":"2026-05-18T04:13:57Z"},{"alias_kind":"arxiv_version","alias_value":"1107.0763v1","created_at":"2026-05-18T04:13:57Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1107.0763","created_at":"2026-05-18T04:13:57Z"},{"alias_kind":"pith_short_12","alias_value":"Y4B3IRX5JXHI","created_at":"2026-05-18T12:26:47Z"},{"alias_kind":"pith_short_16","alias_value":"Y4B3IRX5JXHIKT6J","created_at":"2026-05-18T12:26:47Z"},{"alias_kind":"pith_short_8","alias_value":"Y4B3IRX5","created_at":"2026-05-18T12:26:47Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2011:Y4B3IRX5JXHIKT6JBBS6BR7O7F","target":"record","payload":{"canonical_record":{"source":{"id":"1107.0763","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"gr-qc","submitted_at":"2011-07-05T01:02:29Z","cross_cats_sorted":[],"title_canon_sha256":"e9ef950324cb4d9f64da8c2a3a6dfdf6ff9716f8c88047ce48bbf7a1887db450","abstract_canon_sha256":"6f582c11b41697de826190943ec04b5ad4bfe8c8ae966977915db4869ee75bf9"},"schema_version":"1.0"},"canonical_sha256":"c703b446fd4dce854fc90865e0c7eef94316b5ee7278cb0346ce4b6d930bd249","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T04:13:57.228427Z","signature_b64":"k9HyoovcXvZvZdTie4Nxz6PkJpn12Vo/lC2STjdVYOgHPIDYvc1Y/XjG075VCZxAOP3/OjnjTLtm3PLJJQKrCA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"c703b446fd4dce854fc90865e0c7eef94316b5ee7278cb0346ce4b6d930bd249","last_reissued_at":"2026-05-18T04:13:57.227831Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T04:13:57.227831Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1107.0763","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":"2026-05-18T04:13:57Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"vLI8JeuyG8+8ljLwsxFCytOWqbR9RsWiJgGvpxZmQ2uHtLjPclCsrCuhbcHKketVGXwVbx38CPCf2YcG6sUuCA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-29T18:50:48.832706Z"},"content_sha256":"146fc680273d8ebeb6867405ccfe766e6994fdb299e38f7e025ba69c6cec5745","schema_version":"1.0","event_id":"sha256:146fc680273d8ebeb6867405ccfe766e6994fdb299e38f7e025ba69c6cec5745"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2011:Y4B3IRX5JXHIKT6JBBS6BR7O7F","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"A new AF gravitational instanton","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"gr-qc","authors_text":"Edward Teo, Yu Chen","submitted_at":"2011-07-05T01:02:29Z","abstract_excerpt":"It has long been conjectured that the Euclidean Schwarzschild and Euclidean Kerr instantons are the only non-trivial asymptotically flat (AF) gravitational instantons. In this letter, we show that this conjecture is false by explicitly constructing a new two-parameter AF gravitational instanton with a U(1)xU(1) isometry group, using the inverse-scattering method. It has Euler number \\chi=3 and Hirzebruch signature \\tau=1, and its global topology is CP^2 with a circle S^1 removed appropriately. Various other properties of this gravitational instanton are also discussed."},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1107.0763","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":"2026-05-18T04:13:57Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"Uh8Tml17FNvttKlr7GxSIyI20vdFDeCV3rHpcWiod8QwJFOlCzeAarSZyyNrC3RtTEAfVlw1UvZtAwF9v5veBA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-29T18:50:48.833052Z"},"content_sha256":"eb9a2922d1e4bfafb95bdea0a3b4776d88c640d19cb2cbfde87fe8a3cd065077","schema_version":"1.0","event_id":"sha256:eb9a2922d1e4bfafb95bdea0a3b4776d88c640d19cb2cbfde87fe8a3cd065077"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/Y4B3IRX5JXHIKT6JBBS6BR7O7F/bundle.json","state_url":"https://pith.science/pith/Y4B3IRX5JXHIKT6JBBS6BR7O7F/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/Y4B3IRX5JXHIKT6JBBS6BR7O7F/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":"2026-06-29T18:50:48Z","links":{"resolver":"https://pith.science/pith/Y4B3IRX5JXHIKT6JBBS6BR7O7F","bundle":"https://pith.science/pith/Y4B3IRX5JXHIKT6JBBS6BR7O7F/bundle.json","state":"https://pith.science/pith/Y4B3IRX5JXHIKT6JBBS6BR7O7F/state.json","well_known_bundle":"https://pith.science/.well-known/pith/Y4B3IRX5JXHIKT6JBBS6BR7O7F/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2011:Y4B3IRX5JXHIKT6JBBS6BR7O7F","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":"6f582c11b41697de826190943ec04b5ad4bfe8c8ae966977915db4869ee75bf9","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"gr-qc","submitted_at":"2011-07-05T01:02:29Z","title_canon_sha256":"e9ef950324cb4d9f64da8c2a3a6dfdf6ff9716f8c88047ce48bbf7a1887db450"},"schema_version":"1.0","source":{"id":"1107.0763","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1107.0763","created_at":"2026-05-18T04:13:57Z"},{"alias_kind":"arxiv_version","alias_value":"1107.0763v1","created_at":"2026-05-18T04:13:57Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1107.0763","created_at":"2026-05-18T04:13:57Z"},{"alias_kind":"pith_short_12","alias_value":"Y4B3IRX5JXHI","created_at":"2026-05-18T12:26:47Z"},{"alias_kind":"pith_short_16","alias_value":"Y4B3IRX5JXHIKT6J","created_at":"2026-05-18T12:26:47Z"},{"alias_kind":"pith_short_8","alias_value":"Y4B3IRX5","created_at":"2026-05-18T12:26:47Z"}],"graph_snapshots":[{"event_id":"sha256:eb9a2922d1e4bfafb95bdea0a3b4776d88c640d19cb2cbfde87fe8a3cd065077","target":"graph","created_at":"2026-05-18T04:13:57Z","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 has long been conjectured that the Euclidean Schwarzschild and Euclidean Kerr instantons are the only non-trivial asymptotically flat (AF) gravitational instantons. In this letter, we show that this conjecture is false by explicitly constructing a new two-parameter AF gravitational instanton with a U(1)xU(1) isometry group, using the inverse-scattering method. It has Euler number \\chi=3 and Hirzebruch signature \\tau=1, and its global topology is CP^2 with a circle S^1 removed appropriately. Various other properties of this gravitational instanton are also discussed.","authors_text":"Edward Teo, Yu Chen","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"gr-qc","submitted_at":"2011-07-05T01:02:29Z","title":"A new AF gravitational instanton"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1107.0763","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":"sha256:146fc680273d8ebeb6867405ccfe766e6994fdb299e38f7e025ba69c6cec5745","target":"record","created_at":"2026-05-18T04:13:57Z","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":"6f582c11b41697de826190943ec04b5ad4bfe8c8ae966977915db4869ee75bf9","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"gr-qc","submitted_at":"2011-07-05T01:02:29Z","title_canon_sha256":"e9ef950324cb4d9f64da8c2a3a6dfdf6ff9716f8c88047ce48bbf7a1887db450"},"schema_version":"1.0","source":{"id":"1107.0763","kind":"arxiv","version":1}},"canonical_sha256":"c703b446fd4dce854fc90865e0c7eef94316b5ee7278cb0346ce4b6d930bd249","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"c703b446fd4dce854fc90865e0c7eef94316b5ee7278cb0346ce4b6d930bd249","first_computed_at":"2026-05-18T04:13:57.227831Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T04:13:57.227831Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"k9HyoovcXvZvZdTie4Nxz6PkJpn12Vo/lC2STjdVYOgHPIDYvc1Y/XjG075VCZxAOP3/OjnjTLtm3PLJJQKrCA==","signature_status":"signed_v1","signed_at":"2026-05-18T04:13:57.228427Z","signed_message":"canonical_sha256_bytes"},"source_id":"1107.0763","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:146fc680273d8ebeb6867405ccfe766e6994fdb299e38f7e025ba69c6cec5745","sha256:eb9a2922d1e4bfafb95bdea0a3b4776d88c640d19cb2cbfde87fe8a3cd065077"],"state_sha256":"26d5d26badec6d1e79c4355bf7afeb66cc4e18b90ce52d503d9da7ec81a859d4"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"fA+Z2lTlVxjitAsBTWcslPjJ67+o6hidcCkDCftNsnDoi0LFFTk3BuKjgPssEHAvShBSroq9pgGIAEI29JKSAg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-29T18:50:48.834878Z","bundle_sha256":"0c17252e17443536ff7e5a26a31dd6bafc57dd68c3831c386c000607451dcf71"}}