{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2021:HEP4XHTTE2T3K5QDTTRBEZI6CH","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":"2fe8dbe56a763762df6e93554b4cc12fd47f85d27c5a1e7e0f57edccf92534a7","cross_cats_sorted":["hep-th","nlin.SI","quant-ph"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.str-el","submitted_at":"2021-07-26T13:17:44Z","title_canon_sha256":"248091a0a9ff1cb35f72bc8000bed143d3d2c7d9c46785a13d37d8001c3e56da"},"schema_version":"1.0","source":{"id":"2107.12200","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2107.12200","created_at":"2026-07-05T07:11:49Z"},{"alias_kind":"arxiv_version","alias_value":"2107.12200v2","created_at":"2026-07-05T07:11:49Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2107.12200","created_at":"2026-07-05T07:11:49Z"},{"alias_kind":"pith_short_12","alias_value":"HEP4XHTTE2T3","created_at":"2026-07-05T07:11:49Z"},{"alias_kind":"pith_short_16","alias_value":"HEP4XHTTE2T3K5QD","created_at":"2026-07-05T07:11:49Z"},{"alias_kind":"pith_short_8","alias_value":"HEP4XHTT","created_at":"2026-07-05T07:11:49Z"}],"graph_snapshots":[{"event_id":"sha256:bc4299cbab4658c7171402fd4e46411fc80540b143674d55730c1f123603d409","target":"graph","created_at":"2026-07-05T07:11:49Z","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/2107.12200/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"We introduce a family of inhomogeneous XX spin chains whose squared couplings are a polynomial of degree at most four in the site index. We show how to obtain an asymptotic approximation for the R\\'enyi entanglement entropy of all such chains in a constant magnetic field at half filling by exploiting their connection with the conformal field theory of a massless Dirac fermion in a suitably curved static background. We study the above approximation for three particular chains in the family, two of them related to well-known quasi-exactly solvable quantum models on the line and the third one to ","authors_text":"Artemio Gonz\\'alez-L\\'opez, Federico Finkel","cross_cats":["hep-th","nlin.SI","quant-ph"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.str-el","submitted_at":"2021-07-26T13:17:44Z","title":"Entanglement entropy of inhomogeneous XX spin chains with algebraic interactions"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2107.12200","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":"sha256:47f08df91af0fbdf6851811c952a75bced3728e6ad4d6017f9157ea3a8a0bfa2","target":"record","created_at":"2026-07-05T07:11:49Z","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":"2fe8dbe56a763762df6e93554b4cc12fd47f85d27c5a1e7e0f57edccf92534a7","cross_cats_sorted":["hep-th","nlin.SI","quant-ph"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.str-el","submitted_at":"2021-07-26T13:17:44Z","title_canon_sha256":"248091a0a9ff1cb35f72bc8000bed143d3d2c7d9c46785a13d37d8001c3e56da"},"schema_version":"1.0","source":{"id":"2107.12200","kind":"arxiv","version":2}},"canonical_sha256":"391fcb9e7326a7b576039ce212651e11c760567c15468b6783e2f999668a57ae","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"391fcb9e7326a7b576039ce212651e11c760567c15468b6783e2f999668a57ae","first_computed_at":"2026-07-05T07:11:49.895144Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T07:11:49.895144Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"Z8B8ffTf5IKPuqV70IJTPo5af9dKTJ39NS71Djp8dDjKwC/W3Vu9e7g/7n+BQcVej00OOo12Wzo8eitmcbzcCA==","signature_status":"signed_v1","signed_at":"2026-07-05T07:11:49.895576Z","signed_message":"canonical_sha256_bytes"},"source_id":"2107.12200","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:47f08df91af0fbdf6851811c952a75bced3728e6ad4d6017f9157ea3a8a0bfa2","sha256:bc4299cbab4658c7171402fd4e46411fc80540b143674d55730c1f123603d409"],"state_sha256":"8ccce561a2b7ece1c9295d1230da7b6a488f6076ebfc8b6565b1778ed42365f3"}