{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2015:ILOUNPCMQTCD35EF3ORTAYWKPW","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":"69d1ab58bbda03270804c486d1437e6b958f37431e38ace8bb207d557b4d635c","cross_cats_sorted":["cond-mat.mtrl-sci"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.chem-ph","submitted_at":"2015-01-15T23:21:19Z","title_canon_sha256":"5078d0225b9059c94e805578e70e145cd67394a74656c3b1668b5804071e035e"},"schema_version":"1.0","source":{"id":"1501.03850","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1501.03850","created_at":"2026-05-18T02:29:16Z"},{"alias_kind":"arxiv_version","alias_value":"1501.03850v1","created_at":"2026-05-18T02:29:16Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1501.03850","created_at":"2026-05-18T02:29:16Z"},{"alias_kind":"pith_short_12","alias_value":"ILOUNPCMQTCD","created_at":"2026-05-18T12:29:25Z"},{"alias_kind":"pith_short_16","alias_value":"ILOUNPCMQTCD35EF","created_at":"2026-05-18T12:29:25Z"},{"alias_kind":"pith_short_8","alias_value":"ILOUNPCM","created_at":"2026-05-18T12:29:25Z"}],"graph_snapshots":[{"event_id":"sha256:b344ee18dd5564bf816936bab6d5e98a0533b4f55b06047b973cf7d69d594924","target":"graph","created_at":"2026-05-18T02:29:16Z","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":"Motivated by the disagreement between recent diffusion Monte Carlo calculations and experiments on the phase transition pressure between the ambient and beta-Sn phases of silicon, we present a study of the HCP to BCC phase transition in beryllium. This lighter element provides an oppor- tunity for directly testing many of the approximations required for calculations on silicon and may suggest a path towards increasing the practical accuracy of diffusion Monte Carlo calculations of solids in general. We demonstrate that the single largest approximation in these calculations is the pseudopotenti","authors_text":"Luke Shulenburger, M. P. Desjarlais, Thomas R. Mattsson","cross_cats":["cond-mat.mtrl-sci"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.chem-ph","submitted_at":"2015-01-15T23:21:19Z","title":"Beyond chemical accuracy: The pseudopotential approximation in diffusion Monte Carlo calculations of the HCP to BCC phase transition in beryllium"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1501.03850","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":"sha256:1281053fc9791a35df1952b790eca4c42e0d7ba0def59328c92148438f39fc36","target":"record","created_at":"2026-05-18T02:29:16Z","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":"69d1ab58bbda03270804c486d1437e6b958f37431e38ace8bb207d557b4d635c","cross_cats_sorted":["cond-mat.mtrl-sci"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.chem-ph","submitted_at":"2015-01-15T23:21:19Z","title_canon_sha256":"5078d0225b9059c94e805578e70e145cd67394a74656c3b1668b5804071e035e"},"schema_version":"1.0","source":{"id":"1501.03850","kind":"arxiv","version":1}},"canonical_sha256":"42dd46bc4c84c43df485dba33062ca7d839502407077d5ad3030795910cb36d3","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"42dd46bc4c84c43df485dba33062ca7d839502407077d5ad3030795910cb36d3","first_computed_at":"2026-05-18T02:29:16.884281Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T02:29:16.884281Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"GEclP5cK7w0FYuEMgvSZMGIuD41cnvVkwi0xO15zC7KjdKez9HbiRxIsS2bYkgmfaZt3pv1ugIxztMagMcgqAw==","signature_status":"signed_v1","signed_at":"2026-05-18T02:29:16.884709Z","signed_message":"canonical_sha256_bytes"},"source_id":"1501.03850","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:1281053fc9791a35df1952b790eca4c42e0d7ba0def59328c92148438f39fc36","sha256:b344ee18dd5564bf816936bab6d5e98a0533b4f55b06047b973cf7d69d594924"],"state_sha256":"667cc82aa41abddfc6ff0d008e65a7e7a8fdfec6e7e3908ded0d860cd9488fa1"}