{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2009:R7OPNBHPB5WVAXWPOCC5U6H5FQ","short_pith_number":"pith:R7OPNBHP","canonical_record":{"source":{"id":"0907.3447","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.soft","submitted_at":"2009-07-20T17:15:47Z","cross_cats_sorted":["cond-mat.stat-mech"],"title_canon_sha256":"2691f4d7667b305959b966868bcf6d450fa81b6f88aba59d99b1093f3890f6c4","abstract_canon_sha256":"5e3a6d15b4b65054c9f94bab0966c04d8572146ce3fd4f7bf21dd3964b200e37"},"schema_version":"1.0"},"canonical_sha256":"8fdcf684ef0f6d505ecf7085da78fd2c3593e6cdfac1f670616235861f75206f","source":{"kind":"arxiv","id":"0907.3447","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"0907.3447","created_at":"2026-05-18T04:03:20Z"},{"alias_kind":"arxiv_version","alias_value":"0907.3447v1","created_at":"2026-05-18T04:03:20Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.0907.3447","created_at":"2026-05-18T04:03:20Z"},{"alias_kind":"pith_short_12","alias_value":"R7OPNBHPB5WV","created_at":"2026-05-18T12:26:01Z"},{"alias_kind":"pith_short_16","alias_value":"R7OPNBHPB5WVAXWP","created_at":"2026-05-18T12:26:01Z"},{"alias_kind":"pith_short_8","alias_value":"R7OPNBHP","created_at":"2026-05-18T12:26:01Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2009:R7OPNBHPB5WVAXWPOCC5U6H5FQ","target":"record","payload":{"canonical_record":{"source":{"id":"0907.3447","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.soft","submitted_at":"2009-07-20T17:15:47Z","cross_cats_sorted":["cond-mat.stat-mech"],"title_canon_sha256":"2691f4d7667b305959b966868bcf6d450fa81b6f88aba59d99b1093f3890f6c4","abstract_canon_sha256":"5e3a6d15b4b65054c9f94bab0966c04d8572146ce3fd4f7bf21dd3964b200e37"},"schema_version":"1.0"},"canonical_sha256":"8fdcf684ef0f6d505ecf7085da78fd2c3593e6cdfac1f670616235861f75206f","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T04:03:20.382730Z","signature_b64":"6INsdrF79XGLUngNo4oXU/pR9nHT1TIyXh4RDNwZQ6FuPUiYSPUFiX7Fr09LOkOSq1mlNpKOMNRRA5npAtAcCw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"8fdcf684ef0f6d505ecf7085da78fd2c3593e6cdfac1f670616235861f75206f","last_reissued_at":"2026-05-18T04:03:20.382339Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T04:03:20.382339Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"0907.3447","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":"2026-05-18T04:03:20Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"irb86IzyjXagod6jchXCB7X9GTwWJTYde/P4yxRG9b9tih8dxrEAV35OHfixpSSRWZM6TFXUvBJUxeG4S7n9Bg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-23T00:33:50.750091Z"},"content_sha256":"4fc96d37ca4f8a85a03c790767eab98aa9b4767cd405cabb8fa3d8f0c4be8f88","schema_version":"1.0","event_id":"sha256:4fc96d37ca4f8a85a03c790767eab98aa9b4767cd405cabb8fa3d8f0c4be8f88"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2009:R7OPNBHPB5WVAXWPOCC5U6H5FQ","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Phase diagram of a two-dimensional lattice gas model of a ramp system","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["cond-mat.stat-mech"],"primary_cat":"cond-mat.soft","authors_text":"Enrique Lomba, Jose A. Capitan, Jose A. Cuesta, Noe G. Almarza","submitted_at":"2009-07-20T17:15:47Z","abstract_excerpt":"Using Monte Carlo Simulation and fundamental measure theory we study the phase diagram of a two-dimensional lattice gas model with a nearest neighbor hard core exclusion and a next-to-nearest neighbors finite repulsive interaction. The model presents two competing ranges of interaction and, in common with many experimental systems, exhibits a low density solid phase, which melts back to the fluid phase upon compression. The theoretical approach is found to provide a qualitatively correct picture of the phase diagram of our model system."},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0907.3447","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":"2026-05-18T04:03:20Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"5AAmCSafDEbsMkDu1FcXSpyfdDdId4/al9R9/HUvSObsOK10vHLz40B/7DsgQ77eMAcCsAJUOYKRak8zwZsNAw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-23T00:33:50.750454Z"},"content_sha256":"5b1544ec77b69d0aa78a03fb77f9eebe082a32b326b52d56cc0eec75ef7bac5c","schema_version":"1.0","event_id":"sha256:5b1544ec77b69d0aa78a03fb77f9eebe082a32b326b52d56cc0eec75ef7bac5c"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/R7OPNBHPB5WVAXWPOCC5U6H5FQ/bundle.json","state_url":"https://pith.science/pith/R7OPNBHPB5WVAXWPOCC5U6H5FQ/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/R7OPNBHPB5WVAXWPOCC5U6H5FQ/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":"2026-06-23T00:33:50Z","links":{"resolver":"https://pith.science/pith/R7OPNBHPB5WVAXWPOCC5U6H5FQ","bundle":"https://pith.science/pith/R7OPNBHPB5WVAXWPOCC5U6H5FQ/bundle.json","state":"https://pith.science/pith/R7OPNBHPB5WVAXWPOCC5U6H5FQ/state.json","well_known_bundle":"https://pith.science/.well-known/pith/R7OPNBHPB5WVAXWPOCC5U6H5FQ/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2009:R7OPNBHPB5WVAXWPOCC5U6H5FQ","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":"5e3a6d15b4b65054c9f94bab0966c04d8572146ce3fd4f7bf21dd3964b200e37","cross_cats_sorted":["cond-mat.stat-mech"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.soft","submitted_at":"2009-07-20T17:15:47Z","title_canon_sha256":"2691f4d7667b305959b966868bcf6d450fa81b6f88aba59d99b1093f3890f6c4"},"schema_version":"1.0","source":{"id":"0907.3447","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"0907.3447","created_at":"2026-05-18T04:03:20Z"},{"alias_kind":"arxiv_version","alias_value":"0907.3447v1","created_at":"2026-05-18T04:03:20Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.0907.3447","created_at":"2026-05-18T04:03:20Z"},{"alias_kind":"pith_short_12","alias_value":"R7OPNBHPB5WV","created_at":"2026-05-18T12:26:01Z"},{"alias_kind":"pith_short_16","alias_value":"R7OPNBHPB5WVAXWP","created_at":"2026-05-18T12:26:01Z"},{"alias_kind":"pith_short_8","alias_value":"R7OPNBHP","created_at":"2026-05-18T12:26:01Z"}],"graph_snapshots":[{"event_id":"sha256:5b1544ec77b69d0aa78a03fb77f9eebe082a32b326b52d56cc0eec75ef7bac5c","target":"graph","created_at":"2026-05-18T04:03:20Z","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":"Using Monte Carlo Simulation and fundamental measure theory we study the phase diagram of a two-dimensional lattice gas model with a nearest neighbor hard core exclusion and a next-to-nearest neighbors finite repulsive interaction. The model presents two competing ranges of interaction and, in common with many experimental systems, exhibits a low density solid phase, which melts back to the fluid phase upon compression. The theoretical approach is found to provide a qualitatively correct picture of the phase diagram of our model system.","authors_text":"Enrique Lomba, Jose A. Capitan, Jose A. Cuesta, Noe G. Almarza","cross_cats":["cond-mat.stat-mech"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.soft","submitted_at":"2009-07-20T17:15:47Z","title":"Phase diagram of a two-dimensional lattice gas model of a ramp system"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0907.3447","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":"sha256:4fc96d37ca4f8a85a03c790767eab98aa9b4767cd405cabb8fa3d8f0c4be8f88","target":"record","created_at":"2026-05-18T04:03:20Z","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":"5e3a6d15b4b65054c9f94bab0966c04d8572146ce3fd4f7bf21dd3964b200e37","cross_cats_sorted":["cond-mat.stat-mech"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.soft","submitted_at":"2009-07-20T17:15:47Z","title_canon_sha256":"2691f4d7667b305959b966868bcf6d450fa81b6f88aba59d99b1093f3890f6c4"},"schema_version":"1.0","source":{"id":"0907.3447","kind":"arxiv","version":1}},"canonical_sha256":"8fdcf684ef0f6d505ecf7085da78fd2c3593e6cdfac1f670616235861f75206f","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"8fdcf684ef0f6d505ecf7085da78fd2c3593e6cdfac1f670616235861f75206f","first_computed_at":"2026-05-18T04:03:20.382339Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T04:03:20.382339Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"6INsdrF79XGLUngNo4oXU/pR9nHT1TIyXh4RDNwZQ6FuPUiYSPUFiX7Fr09LOkOSq1mlNpKOMNRRA5npAtAcCw==","signature_status":"signed_v1","signed_at":"2026-05-18T04:03:20.382730Z","signed_message":"canonical_sha256_bytes"},"source_id":"0907.3447","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:4fc96d37ca4f8a85a03c790767eab98aa9b4767cd405cabb8fa3d8f0c4be8f88","sha256:5b1544ec77b69d0aa78a03fb77f9eebe082a32b326b52d56cc0eec75ef7bac5c"],"state_sha256":"91aa83350fb4d15dc1b258921796a9036b5d1524df206f5883aae2e8afea5b65"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"6L+TrudhF2w7q+kL0i4HZMDVMjj60ctiptfdMWxUT5i75vt78vzlXLde5RS9q8cptclqdyBo017IR80WExizBA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-23T00:33:50.752376Z","bundle_sha256":"0c1a3536025d0ad49b5734656d64bb80344bf1db2713e698f6fc6f40f5bfe98c"}}