{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2018:S7NR25L7MEWSZUHVJ2EG5SQBVG","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":"7064dbd81429da0a15d1c270120b7f7df019504edd8185957915459ea477c7c1","cross_cats_sorted":["cond-mat.str-el"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.supr-con","submitted_at":"2018-09-13T12:43:32Z","title_canon_sha256":"e46bedad3d68d7b82320d19925a2c8c0e5ef625fb1cc305a7c8c37d9a6d7ee33"},"schema_version":"1.0","source":{"id":"1809.04916","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1809.04916","created_at":"2026-05-17T23:40:18Z"},{"alias_kind":"arxiv_version","alias_value":"1809.04916v2","created_at":"2026-05-17T23:40:18Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1809.04916","created_at":"2026-05-17T23:40:18Z"},{"alias_kind":"pith_short_12","alias_value":"S7NR25L7MEWS","created_at":"2026-05-18T12:32:50Z"},{"alias_kind":"pith_short_16","alias_value":"S7NR25L7MEWSZUHV","created_at":"2026-05-18T12:32:50Z"},{"alias_kind":"pith_short_8","alias_value":"S7NR25L7","created_at":"2026-05-18T12:32:50Z"}],"graph_snapshots":[{"event_id":"sha256:1688b7b24b5d4fbe71ce220ecc1bcdc33a83161775fb121e8eb2a308e68bf027","target":"graph","created_at":"2026-05-17T23:40:18Z","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 two-dimensional Hubbard model is studied for small values of the interaction strength (U of the order of the hopping amplitude t), using a variational ansatz well suited for this regime. The wave function, a refined Gutzwiller ansatz, has a BCS mean-field state with d-wave symmetry as its reference state. Superconducting order is found for densities n <1 (but not for n=1). This resolves a discrepancy between results obtained with the functional renormalization group, which do predict superconducting order for small values of U, and numerical simulations, which did not find superconductivit","authors_text":"Dionys Baeriswyl","cross_cats":["cond-mat.str-el"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.supr-con","submitted_at":"2018-09-13T12:43:32Z","title":"Superconductivity from repulsion: Variational results for the 2D Hubbard model in the limit of weak interaction"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1809.04916","kind":"arxiv","version":2},"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":"sha256:15649e64fde00459100cf0f9cc95c51de788f562e9bd54f45ca9d3e0f7388c6d","target":"record","created_at":"2026-05-17T23:40:18Z","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":"7064dbd81429da0a15d1c270120b7f7df019504edd8185957915459ea477c7c1","cross_cats_sorted":["cond-mat.str-el"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.supr-con","submitted_at":"2018-09-13T12:43:32Z","title_canon_sha256":"e46bedad3d68d7b82320d19925a2c8c0e5ef625fb1cc305a7c8c37d9a6d7ee33"},"schema_version":"1.0","source":{"id":"1809.04916","kind":"arxiv","version":2}},"canonical_sha256":"97db1d757f612d2cd0f54e886eca01a9b22683f7590ea41e300565599118fc04","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"97db1d757f612d2cd0f54e886eca01a9b22683f7590ea41e300565599118fc04","first_computed_at":"2026-05-17T23:40:18.049302Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-17T23:40:18.049302Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"aLZn95tREvkQ0XMfQm84gnMyz2pInK3j3bMC7vBn2lfKAMmKQCwyem8msDDoHKDbehhTl6mXAumCmhhpZylsCw==","signature_status":"signed_v1","signed_at":"2026-05-17T23:40:18.050070Z","signed_message":"canonical_sha256_bytes"},"source_id":"1809.04916","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:15649e64fde00459100cf0f9cc95c51de788f562e9bd54f45ca9d3e0f7388c6d","sha256:1688b7b24b5d4fbe71ce220ecc1bcdc33a83161775fb121e8eb2a308e68bf027"],"state_sha256":"319c913d152a77d7dbc2f2de512af00256067bc041db1acf1d5ebdfabd1ba960"}