{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:1998:QLS23FTTRSF37BXKUQX4XKKBX3","short_pith_number":"pith:QLS23FTT","canonical_record":{"source":{"id":"cond-mat/9806210","kind":"arxiv","version":1},"metadata":{"license":"","primary_cat":"cond-mat.supr-con","submitted_at":"1998-06-18T05:43:52Z","cross_cats_sorted":["cond-mat.str-el"],"title_canon_sha256":"d364bd8ba74282ebae3ba59cbead1d02edb865e571222d052020b3250d46badb","abstract_canon_sha256":"2534e4498781744cfb6ff46f34edc1de312f0ed841a6b542ac27739c26f8e20f"},"schema_version":"1.0"},"canonical_sha256":"82e5ad96738c8bbf86eaa42fcba941bec5a0eb26f87a4221a312987229f8fd98","source":{"kind":"arxiv","id":"cond-mat/9806210","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"cond-mat/9806210","created_at":"2026-05-18T01:39:30Z"},{"alias_kind":"arxiv_version","alias_value":"cond-mat/9806210v1","created_at":"2026-05-18T01:39:30Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.cond-mat/9806210","created_at":"2026-05-18T01:39:30Z"},{"alias_kind":"pith_short_12","alias_value":"QLS23FTTRSF3","created_at":"2026-05-18T12:25:49Z"},{"alias_kind":"pith_short_16","alias_value":"QLS23FTTRSF37BXK","created_at":"2026-05-18T12:25:49Z"},{"alias_kind":"pith_short_8","alias_value":"QLS23FTT","created_at":"2026-05-18T12:25:49Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:1998:QLS23FTTRSF37BXKUQX4XKKBX3","target":"record","payload":{"canonical_record":{"source":{"id":"cond-mat/9806210","kind":"arxiv","version":1},"metadata":{"license":"","primary_cat":"cond-mat.supr-con","submitted_at":"1998-06-18T05:43:52Z","cross_cats_sorted":["cond-mat.str-el"],"title_canon_sha256":"d364bd8ba74282ebae3ba59cbead1d02edb865e571222d052020b3250d46badb","abstract_canon_sha256":"2534e4498781744cfb6ff46f34edc1de312f0ed841a6b542ac27739c26f8e20f"},"schema_version":"1.0"},"canonical_sha256":"82e5ad96738c8bbf86eaa42fcba941bec5a0eb26f87a4221a312987229f8fd98","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:39:30.342822Z","signature_b64":"4aDd9adGqmOYDOoATtzVvy/k5oxV4UUljtV33SVIcwR5EhQ4bnKlfm4gR8yFfWj+QNtXBjIMNLmUKpV80wH/Bg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"82e5ad96738c8bbf86eaa42fcba941bec5a0eb26f87a4221a312987229f8fd98","last_reissued_at":"2026-05-18T01:39:30.342204Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:39:30.342204Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"cond-mat/9806210","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":"2026-05-18T01:39:30Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"Osvut3EFtgKfG/WyPjxAmpA4yIpoplYZc+AW8P9nrpm62aCPaaLdZ0NApm/bWP6PIlJSqZa0uL2tDcKt/rg5Dg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-27T11:55:17.340180Z"},"content_sha256":"fa025668800012036a8474b7633bf9868b47fdce8ad7366c6c4b99c7837f6c14","schema_version":"1.0","event_id":"sha256:fa025668800012036a8474b7633bf9868b47fdce8ad7366c6c4b99c7837f6c14"},{"event_type":"graph_snapshot","subject_pith_number":"pith:1998:QLS23FTTRSF37BXKUQX4XKKBX3","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Variational Monte Carlo Study on the Superconductivity in the Two-Dimensional Hubbard Model","license":"","headline":"","cross_cats":["cond-mat.str-el"],"primary_cat":"cond-mat.supr-con","authors_text":"1) ((1) Electrotechnical Laboratory, 2), (2) Institute of Materials Science, Japan, Japan), Kunihiko Yamaji (1, Soh Koike (2, Takashi Yanagisawa (1), Takeshi Nakanishi (1), Tsukuba, University of Tsukuba","submitted_at":"1998-06-18T05:43:52Z","abstract_excerpt":"The possibility of superconductivity (SC) in the 2D Hubbard model (2DH) was investigated by means of the variational Monte Carlo method. The energy gain of the d-wave SC state, obtained as the difference of the minimum energy with a finite gap and that with zero gap, was examined with respect to dependences on U, electron density rho and next nearest neighbor transfer t' mainly on the 10 x 10 lattice. It was found to be maximized around U = 8 (in energy unit of t). It sharply increased for negative values of t' and had a broad peak for t' ~ -0.10. For these values of t' the energy gain was a s"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"cond-mat/9806210","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":"2026-05-18T01:39:30Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"JBBcTXLuGtqPXl0CNzyuaWdk6OhMCkoedGcC4V47Mf7A0JhyTVZ6tlxzYKaKCntGC48ZKWHOZhqVaMuhtMsuCw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-27T11:55:17.340841Z"},"content_sha256":"5e99ecb453bbb056eadd08ab6eb68806c59397d3d705dd340bc8db3480c048c2","schema_version":"1.0","event_id":"sha256:5e99ecb453bbb056eadd08ab6eb68806c59397d3d705dd340bc8db3480c048c2"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/QLS23FTTRSF37BXKUQX4XKKBX3/bundle.json","state_url":"https://pith.science/pith/QLS23FTTRSF37BXKUQX4XKKBX3/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/QLS23FTTRSF37BXKUQX4XKKBX3/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":"2026-05-27T11:55:17Z","links":{"resolver":"https://pith.science/pith/QLS23FTTRSF37BXKUQX4XKKBX3","bundle":"https://pith.science/pith/QLS23FTTRSF37BXKUQX4XKKBX3/bundle.json","state":"https://pith.science/pith/QLS23FTTRSF37BXKUQX4XKKBX3/state.json","well_known_bundle":"https://pith.science/.well-known/pith/QLS23FTTRSF37BXKUQX4XKKBX3/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:1998:QLS23FTTRSF37BXKUQX4XKKBX3","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":"2534e4498781744cfb6ff46f34edc1de312f0ed841a6b542ac27739c26f8e20f","cross_cats_sorted":["cond-mat.str-el"],"license":"","primary_cat":"cond-mat.supr-con","submitted_at":"1998-06-18T05:43:52Z","title_canon_sha256":"d364bd8ba74282ebae3ba59cbead1d02edb865e571222d052020b3250d46badb"},"schema_version":"1.0","source":{"id":"cond-mat/9806210","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"cond-mat/9806210","created_at":"2026-05-18T01:39:30Z"},{"alias_kind":"arxiv_version","alias_value":"cond-mat/9806210v1","created_at":"2026-05-18T01:39:30Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.cond-mat/9806210","created_at":"2026-05-18T01:39:30Z"},{"alias_kind":"pith_short_12","alias_value":"QLS23FTTRSF3","created_at":"2026-05-18T12:25:49Z"},{"alias_kind":"pith_short_16","alias_value":"QLS23FTTRSF37BXK","created_at":"2026-05-18T12:25:49Z"},{"alias_kind":"pith_short_8","alias_value":"QLS23FTT","created_at":"2026-05-18T12:25:49Z"}],"graph_snapshots":[{"event_id":"sha256:5e99ecb453bbb056eadd08ab6eb68806c59397d3d705dd340bc8db3480c048c2","target":"graph","created_at":"2026-05-18T01:39:30Z","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 possibility of superconductivity (SC) in the 2D Hubbard model (2DH) was investigated by means of the variational Monte Carlo method. The energy gain of the d-wave SC state, obtained as the difference of the minimum energy with a finite gap and that with zero gap, was examined with respect to dependences on U, electron density rho and next nearest neighbor transfer t' mainly on the 10 x 10 lattice. It was found to be maximized around U = 8 (in energy unit of t). It sharply increased for negative values of t' and had a broad peak for t' ~ -0.10. For these values of t' the energy gain was a s","authors_text":"1) ((1) Electrotechnical Laboratory, 2), (2) Institute of Materials Science, Japan, Japan), Kunihiko Yamaji (1, Soh Koike (2, Takashi Yanagisawa (1), Takeshi Nakanishi (1), Tsukuba, University of Tsukuba","cross_cats":["cond-mat.str-el"],"headline":"","license":"","primary_cat":"cond-mat.supr-con","submitted_at":"1998-06-18T05:43:52Z","title":"Variational Monte Carlo Study on the Superconductivity in the Two-Dimensional Hubbard Model"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"cond-mat/9806210","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:fa025668800012036a8474b7633bf9868b47fdce8ad7366c6c4b99c7837f6c14","target":"record","created_at":"2026-05-18T01:39:30Z","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":"2534e4498781744cfb6ff46f34edc1de312f0ed841a6b542ac27739c26f8e20f","cross_cats_sorted":["cond-mat.str-el"],"license":"","primary_cat":"cond-mat.supr-con","submitted_at":"1998-06-18T05:43:52Z","title_canon_sha256":"d364bd8ba74282ebae3ba59cbead1d02edb865e571222d052020b3250d46badb"},"schema_version":"1.0","source":{"id":"cond-mat/9806210","kind":"arxiv","version":1}},"canonical_sha256":"82e5ad96738c8bbf86eaa42fcba941bec5a0eb26f87a4221a312987229f8fd98","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"82e5ad96738c8bbf86eaa42fcba941bec5a0eb26f87a4221a312987229f8fd98","first_computed_at":"2026-05-18T01:39:30.342204Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:39:30.342204Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"4aDd9adGqmOYDOoATtzVvy/k5oxV4UUljtV33SVIcwR5EhQ4bnKlfm4gR8yFfWj+QNtXBjIMNLmUKpV80wH/Bg==","signature_status":"signed_v1","signed_at":"2026-05-18T01:39:30.342822Z","signed_message":"canonical_sha256_bytes"},"source_id":"cond-mat/9806210","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:fa025668800012036a8474b7633bf9868b47fdce8ad7366c6c4b99c7837f6c14","sha256:5e99ecb453bbb056eadd08ab6eb68806c59397d3d705dd340bc8db3480c048c2"],"state_sha256":"a264f34aefaaa0fce7c67e918f4ef7d993d8b9fb81feda9506ba46599c7c0196"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"KrjKdcGpn+/teW9k8vwOrwybLPN/TmkrxnmEUFMPWYfWcpzUDgjS1Fony8AcMX6JOcGRj7A9jclLj1SMJQUTCg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-27T11:55:17.344203Z","bundle_sha256":"0004643003e3a788cfab4ea52171b8bac0c92c2258fdfda828d586c547475baa"}}