{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2025:PYBYYMKDEZXE66UNXZ5JUKX4WQ","short_pith_number":"pith:PYBYYMKD","canonical_record":{"source":{"id":"2507.01568","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.soft","submitted_at":"2025-07-02T10:34:27Z","cross_cats_sorted":["cond-mat.stat-mech"],"title_canon_sha256":"a32ba1d2ed67223b0a80c94e981be8ff7a9f541ab02021fcd14b85120a872115","abstract_canon_sha256":"1d37ef737ba1c0ea8f7ddcec3a75636151c26fbe10be49239078872ae5404aca"},"schema_version":"1.0"},"canonical_sha256":"7e038c3143266e4f7a8dbe7a9a2afcb422306dc0f4b078415ac72c3199eaf228","source":{"kind":"arxiv","id":"2507.01568","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2507.01568","created_at":"2026-07-05T11:39:12Z"},{"alias_kind":"arxiv_version","alias_value":"2507.01568v2","created_at":"2026-07-05T11:39:12Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2507.01568","created_at":"2026-07-05T11:39:12Z"},{"alias_kind":"pith_short_12","alias_value":"PYBYYMKDEZXE","created_at":"2026-07-05T11:39:12Z"},{"alias_kind":"pith_short_16","alias_value":"PYBYYMKDEZXE66UN","created_at":"2026-07-05T11:39:12Z"},{"alias_kind":"pith_short_8","alias_value":"PYBYYMKD","created_at":"2026-07-05T11:39:12Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2025:PYBYYMKDEZXE66UNXZ5JUKX4WQ","target":"record","payload":{"canonical_record":{"source":{"id":"2507.01568","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.soft","submitted_at":"2025-07-02T10:34:27Z","cross_cats_sorted":["cond-mat.stat-mech"],"title_canon_sha256":"a32ba1d2ed67223b0a80c94e981be8ff7a9f541ab02021fcd14b85120a872115","abstract_canon_sha256":"1d37ef737ba1c0ea8f7ddcec3a75636151c26fbe10be49239078872ae5404aca"},"schema_version":"1.0"},"canonical_sha256":"7e038c3143266e4f7a8dbe7a9a2afcb422306dc0f4b078415ac72c3199eaf228","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T11:39:12.830824Z","signature_b64":"M8n8zENpOabk4rnGw6NiK7qnAjOtSUGOMuPjL2SdvBnfFkPhRJTQ/xGOrV0m758FctFo4toTIWJePugAn87aCw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"7e038c3143266e4f7a8dbe7a9a2afcb422306dc0f4b078415ac72c3199eaf228","last_reissued_at":"2026-07-05T11:39:12.830373Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T11:39:12.830373Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2507.01568","source_version":2,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-07-05T11:39:12Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"ZqVYHXKoZr2hOLaVj00+F+FgkeSe0CdHifiv1Cb+SpyRbLOXcDhlZ554gdy1S1GtBsW2WNzpQQjL87oN/W/cAA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-20T02:29:12.968884Z"},"content_sha256":"1585fccd02c8fcf326276e261ef12331509c2ce66c8468e4f50ff823a3ff60c8","schema_version":"1.0","event_id":"sha256:1585fccd02c8fcf326276e261ef12331509c2ce66c8468e4f50ff823a3ff60c8"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2025:PYBYYMKDEZXE66UNXZ5JUKX4WQ","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Low-temperature anomalies in one-dimensional exactly solvable fluids","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["cond-mat.stat-mech"],"primary_cat":"cond-mat.soft","authors_text":"Igor Trav\\v{e}nec, Ladislav \\v{S}amaj","submitted_at":"2025-07-02T10:34:27Z","abstract_excerpt":"Previous experiments and numerical simulations have revealed that a limited number of two- and three-dimensional particle systems contract in volume upon heating isobarically. This anomalous phenomenon is known as negative thermal expansion (NTE). The present paper focuses on the possibility of NTE in exactly solvable one-dimensional fluids. Firstly, the quantization of classical pure hard rods (free of NTE) does not induce NTE which indicates an unimportant role of quantum mechanics in the topic. Secondly, the classical hard rods with various types of soft nearest-neighbor interactions that c"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2507.01568","kind":"arxiv","version":2},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/2507.01568/integrity.json","findings":[],"available":true,"detectors_run":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938"},"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":"2026-07-05T11:39:12Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"aelxzA4LXELzmrLyC0bXHbpuUMZcl+miNtPNuzbMCi4QbQZm6jWMATE/lSkVxa7LjHdX91JJUhjakQHP6b3GDA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-20T02:29:12.969419Z"},"content_sha256":"9a7a7a34e003b69c0975e9814c6a4aff3453d82e4b00fa811a233738ccfa5a95","schema_version":"1.0","event_id":"sha256:9a7a7a34e003b69c0975e9814c6a4aff3453d82e4b00fa811a233738ccfa5a95"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/PYBYYMKDEZXE66UNXZ5JUKX4WQ/bundle.json","state_url":"https://pith.science/pith/PYBYYMKDEZXE66UNXZ5JUKX4WQ/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/PYBYYMKDEZXE66UNXZ5JUKX4WQ/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":"2026-08-20T02:29:12Z","links":{"resolver":"https://pith.science/pith/PYBYYMKDEZXE66UNXZ5JUKX4WQ","bundle":"https://pith.science/pith/PYBYYMKDEZXE66UNXZ5JUKX4WQ/bundle.json","state":"https://pith.science/pith/PYBYYMKDEZXE66UNXZ5JUKX4WQ/state.json","well_known_bundle":"https://pith.science/.well-known/pith/PYBYYMKDEZXE66UNXZ5JUKX4WQ/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2025:PYBYYMKDEZXE66UNXZ5JUKX4WQ","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":"1d37ef737ba1c0ea8f7ddcec3a75636151c26fbe10be49239078872ae5404aca","cross_cats_sorted":["cond-mat.stat-mech"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.soft","submitted_at":"2025-07-02T10:34:27Z","title_canon_sha256":"a32ba1d2ed67223b0a80c94e981be8ff7a9f541ab02021fcd14b85120a872115"},"schema_version":"1.0","source":{"id":"2507.01568","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2507.01568","created_at":"2026-07-05T11:39:12Z"},{"alias_kind":"arxiv_version","alias_value":"2507.01568v2","created_at":"2026-07-05T11:39:12Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2507.01568","created_at":"2026-07-05T11:39:12Z"},{"alias_kind":"pith_short_12","alias_value":"PYBYYMKDEZXE","created_at":"2026-07-05T11:39:12Z"},{"alias_kind":"pith_short_16","alias_value":"PYBYYMKDEZXE66UN","created_at":"2026-07-05T11:39:12Z"},{"alias_kind":"pith_short_8","alias_value":"PYBYYMKD","created_at":"2026-07-05T11:39:12Z"}],"graph_snapshots":[{"event_id":"sha256:9a7a7a34e003b69c0975e9814c6a4aff3453d82e4b00fa811a233738ccfa5a95","target":"graph","created_at":"2026-07-05T11:39:12Z","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/2507.01568/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"Previous experiments and numerical simulations have revealed that a limited number of two- and three-dimensional particle systems contract in volume upon heating isobarically. This anomalous phenomenon is known as negative thermal expansion (NTE). The present paper focuses on the possibility of NTE in exactly solvable one-dimensional fluids. Firstly, the quantization of classical pure hard rods (free of NTE) does not induce NTE which indicates an unimportant role of quantum mechanics in the topic. Secondly, the classical hard rods with various types of soft nearest-neighbor interactions that c","authors_text":"Igor Trav\\v{e}nec, Ladislav \\v{S}amaj","cross_cats":["cond-mat.stat-mech"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.soft","submitted_at":"2025-07-02T10:34:27Z","title":"Low-temperature anomalies in one-dimensional exactly solvable fluids"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2507.01568","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":"sha256:1585fccd02c8fcf326276e261ef12331509c2ce66c8468e4f50ff823a3ff60c8","target":"record","created_at":"2026-07-05T11:39:12Z","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":"1d37ef737ba1c0ea8f7ddcec3a75636151c26fbe10be49239078872ae5404aca","cross_cats_sorted":["cond-mat.stat-mech"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.soft","submitted_at":"2025-07-02T10:34:27Z","title_canon_sha256":"a32ba1d2ed67223b0a80c94e981be8ff7a9f541ab02021fcd14b85120a872115"},"schema_version":"1.0","source":{"id":"2507.01568","kind":"arxiv","version":2}},"canonical_sha256":"7e038c3143266e4f7a8dbe7a9a2afcb422306dc0f4b078415ac72c3199eaf228","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"7e038c3143266e4f7a8dbe7a9a2afcb422306dc0f4b078415ac72c3199eaf228","first_computed_at":"2026-07-05T11:39:12.830373Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T11:39:12.830373Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"M8n8zENpOabk4rnGw6NiK7qnAjOtSUGOMuPjL2SdvBnfFkPhRJTQ/xGOrV0m758FctFo4toTIWJePugAn87aCw==","signature_status":"signed_v1","signed_at":"2026-07-05T11:39:12.830824Z","signed_message":"canonical_sha256_bytes"},"source_id":"2507.01568","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:1585fccd02c8fcf326276e261ef12331509c2ce66c8468e4f50ff823a3ff60c8","sha256:9a7a7a34e003b69c0975e9814c6a4aff3453d82e4b00fa811a233738ccfa5a95"],"state_sha256":"0e24a1845260d220f1308a7fffe3c4ca066645fae803824bf2443d3b580cb9da"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"3GS4L868pqOdKoEV583fKBME1iO5ejmmxmbmmyt8zHIygQtqcA8pl8dJQ5Jcudm6m7YN5brgtod55GBKarszAg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-20T02:29:12.974668Z","bundle_sha256":"2f2437dcd9e9f93b9200963be7596c659a0f7961dfdbbd2ee3d1ee2a43418451"}}