{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:1998:PARS55VJYZZ26RSEXDCMYXRU4P","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":"e793ad32bc44402124b152473d6bf5eb00e21d9bc68362a77f8097d73da3594b","cross_cats_sorted":["cond-mat.supr-con"],"license":"","primary_cat":"cond-mat.str-el","submitted_at":"1998-01-28T18:26:26Z","title_canon_sha256":"b040665b513f1c80587c4d7ba57396e514bebe84eba10bb954e080e30f9287e3"},"schema_version":"1.0","source":{"id":"cond-mat/9801299","kind":"arxiv","version":4}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"cond-mat/9801299","created_at":"2026-07-04T16:07:33Z"},{"alias_kind":"arxiv_version","alias_value":"cond-mat/9801299v4","created_at":"2026-07-04T16:07:33Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.cond-mat/9801299","created_at":"2026-07-04T16:07:33Z"},{"alias_kind":"pith_short_12","alias_value":"PARS55VJYZZ2","created_at":"2026-07-04T16:07:33Z"},{"alias_kind":"pith_short_16","alias_value":"PARS55VJYZZ26RSE","created_at":"2026-07-04T16:07:33Z"},{"alias_kind":"pith_short_8","alias_value":"PARS55VJ","created_at":"2026-07-04T16:07:33Z"}],"graph_snapshots":[{"event_id":"sha256:130b58ed8d46ab7e37963253c04a1702ff68cd180e38f6105e83165f5b9a9ef1","target":"graph","created_at":"2026-07-04T16:07:33Z","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/cond-mat/9801299/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"Fixed-node Green's function Monte Carlo calculations have been performed for very large 16x6 2D Hubbard lattices, large interaction strengths U=10,20, and 40, and many (15-20) densities between empty and half filling. The nodes were fixed by a simple Slater-Gutzwiller trial wavefunction. For each value of U we obtained a sequence of ground-state energies which is consistent with the possibility of a phase separation close to half-filling, with a hole density in the hole-rich phase which is a decreasing function of U. The energies suffer, however, from a fixed-node bias: more accurate nodes are","authors_text":"A.C. Cosentini, G.B. Bachelet, L. Guidoni, M. Capone","cross_cats":["cond-mat.supr-con"],"headline":"","license":"","primary_cat":"cond-mat.str-el","submitted_at":"1998-01-28T18:26:26Z","title":"Phase separation in the 2D Hubbard model: a fixed-node quantum Monte Carlo study"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"cond-mat/9801299","kind":"arxiv","version":4},"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:dfdbe354230da254a37ce326d82001e0880df8ec62a4a64c2641b020ac080d34","target":"record","created_at":"2026-07-04T16:07:33Z","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":"e793ad32bc44402124b152473d6bf5eb00e21d9bc68362a77f8097d73da3594b","cross_cats_sorted":["cond-mat.supr-con"],"license":"","primary_cat":"cond-mat.str-el","submitted_at":"1998-01-28T18:26:26Z","title_canon_sha256":"b040665b513f1c80587c4d7ba57396e514bebe84eba10bb954e080e30f9287e3"},"schema_version":"1.0","source":{"id":"cond-mat/9801299","kind":"arxiv","version":4}},"canonical_sha256":"78232ef6a9c673af4644b8c4cc5e34e3df44e5b8ac68042a355bfe25c46bfd25","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"78232ef6a9c673af4644b8c4cc5e34e3df44e5b8ac68042a355bfe25c46bfd25","first_computed_at":"2026-07-04T16:07:33.479612Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-04T16:07:33.479612Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"riBE/ObpVj+fPtcGxP0mDw7r5T4MQ+Lexl4KZLzYTIF5zqlnBX34FzMa3CfEYRL6GBmb2YiKChA83Cv1Q8NHCg==","signature_status":"signed_v1","signed_at":"2026-07-04T16:07:33.480033Z","signed_message":"canonical_sha256_bytes"},"source_id":"cond-mat/9801299","source_kind":"arxiv","source_version":4}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:dfdbe354230da254a37ce326d82001e0880df8ec62a4a64c2641b020ac080d34","sha256:130b58ed8d46ab7e37963253c04a1702ff68cd180e38f6105e83165f5b9a9ef1"],"state_sha256":"66ead2fc68cf59edae6781c6d4303dcaacd52f66351504361220426d63c117c4"}