{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2007:7EDZDZFAZSJHDQXY4PDUTZTVCR","short_pith_number":"pith:7EDZDZFA","canonical_record":{"source":{"id":"0707.4630","kind":"arxiv","version":1},"metadata":{"license":"","primary_cat":"cond-mat.other","submitted_at":"2007-07-31T14:44:08Z","cross_cats_sorted":[],"title_canon_sha256":"15ae772029910eb8e12b98aa44de1ca242eca9a55b7fa0a901653edf74befe51","abstract_canon_sha256":"c530e9c5e12a5c5dc1c7fe7f1688094f75a31baaeb50d629bff9b7cf0f304dc1"},"schema_version":"1.0"},"canonical_sha256":"f90791e4a0cc9271c2f8e3c749e6751458f39df2cca5b20f9af82556ed73afb5","source":{"kind":"arxiv","id":"0707.4630","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"0707.4630","created_at":"2026-05-18T00:37:23Z"},{"alias_kind":"arxiv_version","alias_value":"0707.4630v1","created_at":"2026-05-18T00:37:23Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.0707.4630","created_at":"2026-05-18T00:37:23Z"},{"alias_kind":"pith_short_12","alias_value":"7EDZDZFAZSJH","created_at":"2026-05-18T12:25:55Z"},{"alias_kind":"pith_short_16","alias_value":"7EDZDZFAZSJHDQXY","created_at":"2026-05-18T12:25:55Z"},{"alias_kind":"pith_short_8","alias_value":"7EDZDZFA","created_at":"2026-05-18T12:25:55Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2007:7EDZDZFAZSJHDQXY4PDUTZTVCR","target":"record","payload":{"canonical_record":{"source":{"id":"0707.4630","kind":"arxiv","version":1},"metadata":{"license":"","primary_cat":"cond-mat.other","submitted_at":"2007-07-31T14:44:08Z","cross_cats_sorted":[],"title_canon_sha256":"15ae772029910eb8e12b98aa44de1ca242eca9a55b7fa0a901653edf74befe51","abstract_canon_sha256":"c530e9c5e12a5c5dc1c7fe7f1688094f75a31baaeb50d629bff9b7cf0f304dc1"},"schema_version":"1.0"},"canonical_sha256":"f90791e4a0cc9271c2f8e3c749e6751458f39df2cca5b20f9af82556ed73afb5","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T00:37:23.946946Z","signature_b64":"VHE0G7CX/MIHnTG4jrE28IlBd0Cro+ekipBCGMV+YeTfgKE2s3TiNOV3UsBWTwBniqfekuTwg26zsk2JMaUWDQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"f90791e4a0cc9271c2f8e3c749e6751458f39df2cca5b20f9af82556ed73afb5","last_reissued_at":"2026-05-18T00:37:23.946266Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T00:37:23.946266Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"0707.4630","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":"2026-05-18T00:37:23Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"e9V8U18IHQrdL3Dbtr6ywc3yL37/Hwowo8I8T3VmMD+CTCQkhBxrKti4EHCmBBZPLb90DS+7koxfjYcIrn08Ag==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-30T20:04:16.401045Z"},"content_sha256":"60b1e84a276c231fe836142300a5166fb422c3b27b1561ebe612a6939e75688f","schema_version":"1.0","event_id":"sha256:60b1e84a276c231fe836142300a5166fb422c3b27b1561ebe612a6939e75688f"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2007:7EDZDZFAZSJHDQXY4PDUTZTVCR","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Ground state properties of a homogeneous 2D system of Bosons with dipolar interactions","license":"","headline":"","cross_cats":[],"primary_cat":"cond-mat.other","authors_text":"G.E. Astrakharchik, I.L. Kurbakov, J. Boronat, J. Casulleras, Yu.E. Lozovik","submitted_at":"2007-07-31T14:44:08Z","abstract_excerpt":"The ground-state phase properties of a two-dimensional Bose system with dipole-dipole interactions is studied by means of quantum Monte Carlo techniques. Limitations of mean-field theory in a two-dimensional geometry are discussed. A quantum phase transition from gas to solid is found. Crystal is tested for existence of a supersolid in the vicinity of the phase transition. Existence of mesoscopic analogue of the off-diagonal long-range order is shown in the one-body density matrix in a finite-size crystal. Non-zero superfluid fraction is found in a finite-size crystal, the signal being dramati"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0707.4630","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":"2026-05-18T00:37:23Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"iRt1ZfgxTSJPSgrpnjOh66n6ymbSwRalckNVkY7X34VhGfVrCYWh6JZx4fXUCN5OtkXQ5GTuulixDLBQYzKECQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-30T20:04:16.401417Z"},"content_sha256":"931a5c7310ec6fcb11f77bf1591128e7d9eaa064093ef0f9a3e490508a189294","schema_version":"1.0","event_id":"sha256:931a5c7310ec6fcb11f77bf1591128e7d9eaa064093ef0f9a3e490508a189294"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/7EDZDZFAZSJHDQXY4PDUTZTVCR/bundle.json","state_url":"https://pith.science/pith/7EDZDZFAZSJHDQXY4PDUTZTVCR/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/7EDZDZFAZSJHDQXY4PDUTZTVCR/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":"2026-05-30T20:04:16Z","links":{"resolver":"https://pith.science/pith/7EDZDZFAZSJHDQXY4PDUTZTVCR","bundle":"https://pith.science/pith/7EDZDZFAZSJHDQXY4PDUTZTVCR/bundle.json","state":"https://pith.science/pith/7EDZDZFAZSJHDQXY4PDUTZTVCR/state.json","well_known_bundle":"https://pith.science/.well-known/pith/7EDZDZFAZSJHDQXY4PDUTZTVCR/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2007:7EDZDZFAZSJHDQXY4PDUTZTVCR","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":"c530e9c5e12a5c5dc1c7fe7f1688094f75a31baaeb50d629bff9b7cf0f304dc1","cross_cats_sorted":[],"license":"","primary_cat":"cond-mat.other","submitted_at":"2007-07-31T14:44:08Z","title_canon_sha256":"15ae772029910eb8e12b98aa44de1ca242eca9a55b7fa0a901653edf74befe51"},"schema_version":"1.0","source":{"id":"0707.4630","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"0707.4630","created_at":"2026-05-18T00:37:23Z"},{"alias_kind":"arxiv_version","alias_value":"0707.4630v1","created_at":"2026-05-18T00:37:23Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.0707.4630","created_at":"2026-05-18T00:37:23Z"},{"alias_kind":"pith_short_12","alias_value":"7EDZDZFAZSJH","created_at":"2026-05-18T12:25:55Z"},{"alias_kind":"pith_short_16","alias_value":"7EDZDZFAZSJHDQXY","created_at":"2026-05-18T12:25:55Z"},{"alias_kind":"pith_short_8","alias_value":"7EDZDZFA","created_at":"2026-05-18T12:25:55Z"}],"graph_snapshots":[{"event_id":"sha256:931a5c7310ec6fcb11f77bf1591128e7d9eaa064093ef0f9a3e490508a189294","target":"graph","created_at":"2026-05-18T00:37:23Z","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 ground-state phase properties of a two-dimensional Bose system with dipole-dipole interactions is studied by means of quantum Monte Carlo techniques. Limitations of mean-field theory in a two-dimensional geometry are discussed. A quantum phase transition from gas to solid is found. Crystal is tested for existence of a supersolid in the vicinity of the phase transition. Existence of mesoscopic analogue of the off-diagonal long-range order is shown in the one-body density matrix in a finite-size crystal. Non-zero superfluid fraction is found in a finite-size crystal, the signal being dramati","authors_text":"G.E. Astrakharchik, I.L. Kurbakov, J. Boronat, J. Casulleras, Yu.E. Lozovik","cross_cats":[],"headline":"","license":"","primary_cat":"cond-mat.other","submitted_at":"2007-07-31T14:44:08Z","title":"Ground state properties of a homogeneous 2D system of Bosons with dipolar interactions"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0707.4630","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":"sha256:60b1e84a276c231fe836142300a5166fb422c3b27b1561ebe612a6939e75688f","target":"record","created_at":"2026-05-18T00:37:23Z","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":"c530e9c5e12a5c5dc1c7fe7f1688094f75a31baaeb50d629bff9b7cf0f304dc1","cross_cats_sorted":[],"license":"","primary_cat":"cond-mat.other","submitted_at":"2007-07-31T14:44:08Z","title_canon_sha256":"15ae772029910eb8e12b98aa44de1ca242eca9a55b7fa0a901653edf74befe51"},"schema_version":"1.0","source":{"id":"0707.4630","kind":"arxiv","version":1}},"canonical_sha256":"f90791e4a0cc9271c2f8e3c749e6751458f39df2cca5b20f9af82556ed73afb5","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"f90791e4a0cc9271c2f8e3c749e6751458f39df2cca5b20f9af82556ed73afb5","first_computed_at":"2026-05-18T00:37:23.946266Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:37:23.946266Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"VHE0G7CX/MIHnTG4jrE28IlBd0Cro+ekipBCGMV+YeTfgKE2s3TiNOV3UsBWTwBniqfekuTwg26zsk2JMaUWDQ==","signature_status":"signed_v1","signed_at":"2026-05-18T00:37:23.946946Z","signed_message":"canonical_sha256_bytes"},"source_id":"0707.4630","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:60b1e84a276c231fe836142300a5166fb422c3b27b1561ebe612a6939e75688f","sha256:931a5c7310ec6fcb11f77bf1591128e7d9eaa064093ef0f9a3e490508a189294"],"state_sha256":"30c1e4b7b0a57311a47f06843337a4d8942ad5ffe1e0d2260bcd0a6562875b2f"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"YEBESGYohXRZYZD3bsNNSKoOFVng/x4gasmwiAqLLSAdT/Xp/Ly9M0UfuZEcC5zwzf2bnTvvbvLMDrXV+vGkCA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-30T20:04:16.403591Z","bundle_sha256":"bee3e82df94aab2542f99fee5ba06f3daba3b24c018a5330541e7c9e5653b3b5"}}