{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2015:ATNKOCFSWAZKBUXMXYBP57R5CM","short_pith_number":"pith:ATNKOCFS","canonical_record":{"source":{"id":"1501.01855","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"hep-lat","submitted_at":"2015-01-08T14:09:29Z","cross_cats_sorted":[],"title_canon_sha256":"ca6894b78d7c4f0b81d531390373a9a23c4c08a1af36a78e17efbfb96973ec74","abstract_canon_sha256":"3209f632e97f43eca3ada13ee163e89e1d3cdf8b7d57c7fe62c07058d5128a1c"},"schema_version":"1.0"},"canonical_sha256":"04daa708b2b032a0d2ecbe02fefe3d133631fe15bbc79f9d6800cafd6c5627c6","source":{"kind":"arxiv","id":"1501.01855","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1501.01855","created_at":"2026-05-18T01:15:47Z"},{"alias_kind":"arxiv_version","alias_value":"1501.01855v1","created_at":"2026-05-18T01:15:47Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1501.01855","created_at":"2026-05-18T01:15:47Z"},{"alias_kind":"pith_short_12","alias_value":"ATNKOCFSWAZK","created_at":"2026-05-18T12:29:10Z"},{"alias_kind":"pith_short_16","alias_value":"ATNKOCFSWAZKBUXM","created_at":"2026-05-18T12:29:10Z"},{"alias_kind":"pith_short_8","alias_value":"ATNKOCFS","created_at":"2026-05-18T12:29:10Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2015:ATNKOCFSWAZKBUXMXYBP57R5CM","target":"record","payload":{"canonical_record":{"source":{"id":"1501.01855","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"hep-lat","submitted_at":"2015-01-08T14:09:29Z","cross_cats_sorted":[],"title_canon_sha256":"ca6894b78d7c4f0b81d531390373a9a23c4c08a1af36a78e17efbfb96973ec74","abstract_canon_sha256":"3209f632e97f43eca3ada13ee163e89e1d3cdf8b7d57c7fe62c07058d5128a1c"},"schema_version":"1.0"},"canonical_sha256":"04daa708b2b032a0d2ecbe02fefe3d133631fe15bbc79f9d6800cafd6c5627c6","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:15:47.077351Z","signature_b64":"WmQZ2v6YAIOycO/qxA2pHDNvuDm5GljCrGzZUOSg30vTcvO8OFNv/XTrtmbiGHnOHPA4YyN5pYZJeLSCNA7/BQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"04daa708b2b032a0d2ecbe02fefe3d133631fe15bbc79f9d6800cafd6c5627c6","last_reissued_at":"2026-05-18T01:15:47.076686Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:15:47.076686Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1501.01855","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":"2026-05-18T01:15:47Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"Rj7I7Az6LgLb7KdEgpHtRoGmJKwNjVImzaTOouEa7BN+cCVNvi6+DA9qEJYeueHouY6SDQFDsi24mqpJqZ20Cw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-26T18:00:10.919456Z"},"content_sha256":"0767df6a79a63162791864bcaa43987af20e09c06b54e53ddea8a61476900dee","schema_version":"1.0","event_id":"sha256:0767df6a79a63162791864bcaa43987af20e09c06b54e53ddea8a61476900dee"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2015:ATNKOCFSWAZKBUXMXYBP57R5CM","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"The eigSUMR inverter for overlap fermion","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"hep-lat","authors_text":"Nigel Cundy, Weonjong Lee","submitted_at":"2015-01-08T14:09:29Z","abstract_excerpt":"We discuss the usage and applicability of deflation methods for the overlap lattice Dirac operator, focussing on calculating the eigenvalues using a method similar to the eigCG algorithm used for other Dirac operators. The overlap operator, which contains several theoretical advantages over other formulations of lattice Quantum Chromodynamics, is more computationally expensive because it requires the computation of the matrix sign function. The principle change made compared to deflation methods for other formulations of lattice QCD is that it is necessary for best performance to tune or relax"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1501.01855","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":"2026-05-18T01:15:47Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"6UBb4cyvMgGMnz5apT6Bho2mX26ll4U6lQc2tgwQqUnT6o8QxSVJ04aUeY8ObX+moFmbTElpqnK0lu8NQEjECA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-26T18:00:10.919855Z"},"content_sha256":"51dfbd37c79081fe388c04a359023012556b059bd97495d9c2180f2da0a638ba","schema_version":"1.0","event_id":"sha256:51dfbd37c79081fe388c04a359023012556b059bd97495d9c2180f2da0a638ba"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/ATNKOCFSWAZKBUXMXYBP57R5CM/bundle.json","state_url":"https://pith.science/pith/ATNKOCFSWAZKBUXMXYBP57R5CM/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/ATNKOCFSWAZKBUXMXYBP57R5CM/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":"2026-05-26T18:00:10Z","links":{"resolver":"https://pith.science/pith/ATNKOCFSWAZKBUXMXYBP57R5CM","bundle":"https://pith.science/pith/ATNKOCFSWAZKBUXMXYBP57R5CM/bundle.json","state":"https://pith.science/pith/ATNKOCFSWAZKBUXMXYBP57R5CM/state.json","well_known_bundle":"https://pith.science/.well-known/pith/ATNKOCFSWAZKBUXMXYBP57R5CM/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2015:ATNKOCFSWAZKBUXMXYBP57R5CM","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":"3209f632e97f43eca3ada13ee163e89e1d3cdf8b7d57c7fe62c07058d5128a1c","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"hep-lat","submitted_at":"2015-01-08T14:09:29Z","title_canon_sha256":"ca6894b78d7c4f0b81d531390373a9a23c4c08a1af36a78e17efbfb96973ec74"},"schema_version":"1.0","source":{"id":"1501.01855","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1501.01855","created_at":"2026-05-18T01:15:47Z"},{"alias_kind":"arxiv_version","alias_value":"1501.01855v1","created_at":"2026-05-18T01:15:47Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1501.01855","created_at":"2026-05-18T01:15:47Z"},{"alias_kind":"pith_short_12","alias_value":"ATNKOCFSWAZK","created_at":"2026-05-18T12:29:10Z"},{"alias_kind":"pith_short_16","alias_value":"ATNKOCFSWAZKBUXM","created_at":"2026-05-18T12:29:10Z"},{"alias_kind":"pith_short_8","alias_value":"ATNKOCFS","created_at":"2026-05-18T12:29:10Z"}],"graph_snapshots":[{"event_id":"sha256:51dfbd37c79081fe388c04a359023012556b059bd97495d9c2180f2da0a638ba","target":"graph","created_at":"2026-05-18T01:15:47Z","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 discuss the usage and applicability of deflation methods for the overlap lattice Dirac operator, focussing on calculating the eigenvalues using a method similar to the eigCG algorithm used for other Dirac operators. The overlap operator, which contains several theoretical advantages over other formulations of lattice Quantum Chromodynamics, is more computationally expensive because it requires the computation of the matrix sign function. The principle change made compared to deflation methods for other formulations of lattice QCD is that it is necessary for best performance to tune or relax","authors_text":"Nigel Cundy, Weonjong Lee","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"hep-lat","submitted_at":"2015-01-08T14:09:29Z","title":"The eigSUMR inverter for overlap fermion"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1501.01855","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":"sha256:0767df6a79a63162791864bcaa43987af20e09c06b54e53ddea8a61476900dee","target":"record","created_at":"2026-05-18T01:15:47Z","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":"3209f632e97f43eca3ada13ee163e89e1d3cdf8b7d57c7fe62c07058d5128a1c","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"hep-lat","submitted_at":"2015-01-08T14:09:29Z","title_canon_sha256":"ca6894b78d7c4f0b81d531390373a9a23c4c08a1af36a78e17efbfb96973ec74"},"schema_version":"1.0","source":{"id":"1501.01855","kind":"arxiv","version":1}},"canonical_sha256":"04daa708b2b032a0d2ecbe02fefe3d133631fe15bbc79f9d6800cafd6c5627c6","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"04daa708b2b032a0d2ecbe02fefe3d133631fe15bbc79f9d6800cafd6c5627c6","first_computed_at":"2026-05-18T01:15:47.076686Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:15:47.076686Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"WmQZ2v6YAIOycO/qxA2pHDNvuDm5GljCrGzZUOSg30vTcvO8OFNv/XTrtmbiGHnOHPA4YyN5pYZJeLSCNA7/BQ==","signature_status":"signed_v1","signed_at":"2026-05-18T01:15:47.077351Z","signed_message":"canonical_sha256_bytes"},"source_id":"1501.01855","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:0767df6a79a63162791864bcaa43987af20e09c06b54e53ddea8a61476900dee","sha256:51dfbd37c79081fe388c04a359023012556b059bd97495d9c2180f2da0a638ba"],"state_sha256":"540c06a8039021d5a1075849c5f9f0f602b2626b4abd890626b4504a4c9a7bcd"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"uHd/5NU/HbMHQ1P7pbIez2ByfKUOBNQAui56zXhViHLZHBg5zoUxfCllqaU2wjwHX+r/TMcuOos3wMVpuLRnCQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-26T18:00:10.923564Z","bundle_sha256":"fa8d7bd06efbd8438f89f4259992089a924d92d392f22c6d798126c06e7b6ef4"}}