{"record_type":"pith_number_record","schema_url":"https://pith.science/schemas/pith-number/v1.json","pith_number":"pith:2013:OFH45G6RR5J75YJACELE37D3VE","short_pith_number":"pith:OFH45G6R","schema_version":"1.0","canonical_sha256":"714fce9bd18f53fee12011164dfc7ba92a745451002062748c7aff9ade4a2a13","source":{"kind":"arxiv","id":"1305.3732","version":2},"attestation_state":"computed","paper":{"title":"Excitation spectrum in two-dimensional superfluid 4He","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["cond-mat.stat-mech"],"primary_cat":"cond-mat.other","authors_text":"D. E. Galli, E. Vitali, F. Arrigoni, L. Reatto","submitted_at":"2013-05-16T09:30:07Z","abstract_excerpt":"In this work we perform an ab-initio study of an ideal two-dimensional sample of 4He atoms, a model for 4He films adsorbed on several kinds of substrates. Starting from a realistic hamiltonian we face the microscopic study of the excitation phonon-roton spectrum of the system at zero temperature. Our approach relies on Path Integral Ground State Monte Carlo projection methods, allowing to evaluate exactly the dynamical density correlation functions in imaginary time, and this gives access to the dynamical structure factor of the system S(q,omega), containing information about the excitation sp"},"verification_status":{"content_addressed":true,"pith_receipt":true,"author_attested":false,"weak_author_claims":0,"strong_author_claims":0,"externally_anchored":false,"storage_verified":false,"citation_signatures":0,"replication_records":0,"graph_snapshot":true,"references_resolved":false,"formal_links_present":false},"canonical_record":{"source":{"id":"1305.3732","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.other","submitted_at":"2013-05-16T09:30:07Z","cross_cats_sorted":["cond-mat.stat-mech"],"title_canon_sha256":"cadbd4c05d043f87974e581f30350a1f7693012bc66cc39bceb4621eb24006ae","abstract_canon_sha256":"fa6d5894e4833f2c90c15d06c7b90f0778f6692bd9a0a3f8e179241ee3b9bb48"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:49:56.494428Z","signature_b64":"cHh718NkU4wR5titgjphTyg97bTwSQr/Gid21F6oilsn9gmXcCyIBG4Zv6zvGW/p0NSNBUHA2UWrkqYwJ6juBA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"714fce9bd18f53fee12011164dfc7ba92a745451002062748c7aff9ade4a2a13","last_reissued_at":"2026-05-18T01:49:56.493808Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:49:56.493808Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"Excitation spectrum in two-dimensional superfluid 4He","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["cond-mat.stat-mech"],"primary_cat":"cond-mat.other","authors_text":"D. E. Galli, E. Vitali, F. Arrigoni, L. Reatto","submitted_at":"2013-05-16T09:30:07Z","abstract_excerpt":"In this work we perform an ab-initio study of an ideal two-dimensional sample of 4He atoms, a model for 4He films adsorbed on several kinds of substrates. Starting from a realistic hamiltonian we face the microscopic study of the excitation phonon-roton spectrum of the system at zero temperature. Our approach relies on Path Integral Ground State Monte Carlo projection methods, allowing to evaluate exactly the dynamical density correlation functions in imaginary time, and this gives access to the dynamical structure factor of the system S(q,omega), containing information about the excitation sp"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1305.3732","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":""},"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"},"aliases":[{"alias_kind":"arxiv","alias_value":"1305.3732","created_at":"2026-05-18T01:49:56.493889+00:00"},{"alias_kind":"arxiv_version","alias_value":"1305.3732v2","created_at":"2026-05-18T01:49:56.493889+00:00"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1305.3732","created_at":"2026-05-18T01:49:56.493889+00:00"},{"alias_kind":"pith_short_12","alias_value":"OFH45G6RR5J7","created_at":"2026-05-18T12:27:54.935989+00:00"},{"alias_kind":"pith_short_16","alias_value":"OFH45G6RR5J75YJA","created_at":"2026-05-18T12:27:54.935989+00:00"},{"alias_kind":"pith_short_8","alias_value":"OFH45G6R","created_at":"2026-05-18T12:27:54.935989+00:00"}],"events":[],"event_summary":{},"paper_claims":[],"inbound_citations":{"count":0,"internal_anchor_count":0,"sample":[]},"formal_canon":{"evidence_count":0,"sample":[],"anchors":[]},"links":{"html":"https://pith.science/pith/OFH45G6RR5J75YJACELE37D3VE","json":"https://pith.science/pith/OFH45G6RR5J75YJACELE37D3VE.json","graph_json":"https://pith.science/api/pith-number/OFH45G6RR5J75YJACELE37D3VE/graph.json","events_json":"https://pith.science/api/pith-number/OFH45G6RR5J75YJACELE37D3VE/events.json","paper":"https://pith.science/paper/OFH45G6R"},"agent_actions":{"view_html":"https://pith.science/pith/OFH45G6RR5J75YJACELE37D3VE","download_json":"https://pith.science/pith/OFH45G6RR5J75YJACELE37D3VE.json","view_paper":"https://pith.science/paper/OFH45G6R","resolve_alias":"https://pith.science/api/pith-number/resolve?arxiv=1305.3732&json=true","fetch_graph":"https://pith.science/api/pith-number/OFH45G6RR5J75YJACELE37D3VE/graph.json","fetch_events":"https://pith.science/api/pith-number/OFH45G6RR5J75YJACELE37D3VE/events.json","actions":{"anchor_timestamp":"https://pith.science/pith/OFH45G6RR5J75YJACELE37D3VE/action/timestamp_anchor","attest_storage":"https://pith.science/pith/OFH45G6RR5J75YJACELE37D3VE/action/storage_attestation","attest_author":"https://pith.science/pith/OFH45G6RR5J75YJACELE37D3VE/action/author_attestation","sign_citation":"https://pith.science/pith/OFH45G6RR5J75YJACELE37D3VE/action/citation_signature","submit_replication":"https://pith.science/pith/OFH45G6RR5J75YJACELE37D3VE/action/replication_record"}},"created_at":"2026-05-18T01:49:56.493889+00:00","updated_at":"2026-05-18T01:49:56.493889+00:00"}