{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2017:PHBOI5M3ZPYIC2NM2YCFTUNLEA","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":"c9a1bec82a43f94e455e2af4f9bf986e08137e57978c9788d2aadf4215465cc7","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2017-01-23T10:39:05Z","title_canon_sha256":"96eb69dba02fa79634c9c3ad1e2bfab368c51f922190649986d84cf658668419"},"schema_version":"1.0","source":{"id":"1701.06326","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1701.06326","created_at":"2026-05-18T00:45:42Z"},{"alias_kind":"arxiv_version","alias_value":"1701.06326v1","created_at":"2026-05-18T00:45:42Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1701.06326","created_at":"2026-05-18T00:45:42Z"},{"alias_kind":"pith_short_12","alias_value":"PHBOI5M3ZPYI","created_at":"2026-05-18T12:31:37Z"},{"alias_kind":"pith_short_16","alias_value":"PHBOI5M3ZPYIC2NM","created_at":"2026-05-18T12:31:37Z"},{"alias_kind":"pith_short_8","alias_value":"PHBOI5M3","created_at":"2026-05-18T12:31:37Z"}],"graph_snapshots":[{"event_id":"sha256:db72d1bbf0725301fc84fa71993ccd82076f78bb052d47c075334be171b8f6bc","target":"graph","created_at":"2026-05-18T00:45:42Z","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":"We compare the optical absorption of extended systems using the density-density and current-current linear response functions calculated within many-body perturbation theory. The two approaches are formally equivalent for a finite momentum $\\mathbf{q}$ of the external perturbation. At $\\mathbf{q}=\\mathbf{0}$, however, the equivalence is maintained only if a small $q$ expansion of the density-density response function is used. Moreover, in practical calculations this equivalence can be lost if one naively extends the strategies usually employed in the density-based approach to the current-based","authors_text":"A. Berger, C. Attaccalite, D. Sangalli, M. Gruning, P. Romaniello","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2017-01-23T10:39:05Z","title":"Optical properties of periodic systems within the current-current response framework: pitfalls and remedies"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1701.06326","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":"sha256:8c385d0452abd0ea246f4dce998fb49917f5472a9ecef631ae1d6db4c32a4352","target":"record","created_at":"2026-05-18T00:45:42Z","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":"c9a1bec82a43f94e455e2af4f9bf986e08137e57978c9788d2aadf4215465cc7","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2017-01-23T10:39:05Z","title_canon_sha256":"96eb69dba02fa79634c9c3ad1e2bfab368c51f922190649986d84cf658668419"},"schema_version":"1.0","source":{"id":"1701.06326","kind":"arxiv","version":1}},"canonical_sha256":"79c2e4759bcbf08169acd60459d1ab20058910a34168ee1198846ace515cf4e9","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"79c2e4759bcbf08169acd60459d1ab20058910a34168ee1198846ace515cf4e9","first_computed_at":"2026-05-18T00:45:42.871149Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:45:42.871149Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"gax/BlkNlj5eiTjulzOPV+8COtngswY/r7GtxHHqbXi6hlHayRjHYKH1M+PaHI682GnvWo99R1yvHMwNXv+0CA==","signature_status":"signed_v1","signed_at":"2026-05-18T00:45:42.871654Z","signed_message":"canonical_sha256_bytes"},"source_id":"1701.06326","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:8c385d0452abd0ea246f4dce998fb49917f5472a9ecef631ae1d6db4c32a4352","sha256:db72d1bbf0725301fc84fa71993ccd82076f78bb052d47c075334be171b8f6bc"],"state_sha256":"f2a6ee7a0b8ed38422d5129914d3b0c307170f3a15a874c8d157570ebbc32e78"}