{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2018:Y4M4HXXOAIOWN2GGTN4RSMVSR2","short_pith_number":"pith:Y4M4HXXO","canonical_record":{"source":{"id":"1804.06573","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2018-04-18T06:57:15Z","cross_cats_sorted":[],"title_canon_sha256":"579fee7e807094255f8f9242fe9a5378464733344558d24b6d8476460295288f","abstract_canon_sha256":"e136701cd30280af1baaf8bd4b8818c232c6ff5a013c91657c1ef122f6bb3860"},"schema_version":"1.0"},"canonical_sha256":"c719c3deee021d66e8c69b791932b28eb9810f9deb3cabd7119bd5217e9710c6","source":{"kind":"arxiv","id":"1804.06573","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1804.06573","created_at":"2026-05-18T00:02:45Z"},{"alias_kind":"arxiv_version","alias_value":"1804.06573v2","created_at":"2026-05-18T00:02:45Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1804.06573","created_at":"2026-05-18T00:02:45Z"},{"alias_kind":"pith_short_12","alias_value":"Y4M4HXXOAIOW","created_at":"2026-05-18T12:33:04Z"},{"alias_kind":"pith_short_16","alias_value":"Y4M4HXXOAIOWN2GG","created_at":"2026-05-18T12:33:04Z"},{"alias_kind":"pith_short_8","alias_value":"Y4M4HXXO","created_at":"2026-05-18T12:33:04Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2018:Y4M4HXXOAIOWN2GGTN4RSMVSR2","target":"record","payload":{"canonical_record":{"source":{"id":"1804.06573","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2018-04-18T06:57:15Z","cross_cats_sorted":[],"title_canon_sha256":"579fee7e807094255f8f9242fe9a5378464733344558d24b6d8476460295288f","abstract_canon_sha256":"e136701cd30280af1baaf8bd4b8818c232c6ff5a013c91657c1ef122f6bb3860"},"schema_version":"1.0"},"canonical_sha256":"c719c3deee021d66e8c69b791932b28eb9810f9deb3cabd7119bd5217e9710c6","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T00:02:45.016596Z","signature_b64":"FyRCZ0tV8JSpYxNLaQSZ6HBMjUOd5JfKpt08MznTfoJ1JrMkuJyZ15LAk6vMlsjl0ACF3QKvi4Xj8kbUYFTXCg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"c719c3deee021d66e8c69b791932b28eb9810f9deb3cabd7119bd5217e9710c6","last_reissued_at":"2026-05-18T00:02:45.016147Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T00:02:45.016147Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1804.06573","source_version":2,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T00:02:45Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"LTkz4sn+KcM96zfogpSGNCp5TgTe0GgTJMnXH3tGs6YFAweAxAoySCChfbu+PxVD7w9SPvnkQ4BD3GvVIsbvDg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-23T15:40:15.859066Z"},"content_sha256":"88d9a4c461e79d7ee4659d9346df1cfc24e6d6798a9d5744b03421a3ff1293d7","schema_version":"1.0","event_id":"sha256:88d9a4c461e79d7ee4659d9346df1cfc24e6d6798a9d5744b03421a3ff1293d7"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2018:Y4M4HXXOAIOWN2GGTN4RSMVSR2","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Spin dynamics from time-dependent density functional perturbation theory","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"cond-mat.mtrl-sci","authors_text":"Iurii Timrov, Stefano Baroni, Tommaso Gorni","submitted_at":"2018-04-18T06:57:15Z","abstract_excerpt":"We present a new method to model spin-wave excitations in magnetic solids, based on the Liouville-Lanczos approach to time-dependent density functional perturbation theory. This method avoids computationally expensive sums over empty states and naturally deals with the coupling between spin and charge fluctuations, without ever explicitly computing charge-density susceptibilities. Spin-wave excitations are obtained with one Lanczos chain per magnon wave-number and polarization, avoiding the solution of the linear-response problem for every individual value of frequency, as other state-of-the-a"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1804.06573","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"},"verdict_id":null},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T00:02:45Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"XFc7mb+4UIYy1fH6xSqsvUcFqc9fYKdJjcSGT2cArlgBfiYdpcZZ4F7y3KDqr3WQ1WhRbnlIYUeZuiJzZ155Cg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-23T15:40:15.859414Z"},"content_sha256":"9fbe214c5f7e6f133a75879048277a93dc8d14b30950cc9df1effa44d281e068","schema_version":"1.0","event_id":"sha256:9fbe214c5f7e6f133a75879048277a93dc8d14b30950cc9df1effa44d281e068"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/Y4M4HXXOAIOWN2GGTN4RSMVSR2/bundle.json","state_url":"https://pith.science/pith/Y4M4HXXOAIOWN2GGTN4RSMVSR2/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/Y4M4HXXOAIOWN2GGTN4RSMVSR2/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":"2026-06-23T15:40:15Z","links":{"resolver":"https://pith.science/pith/Y4M4HXXOAIOWN2GGTN4RSMVSR2","bundle":"https://pith.science/pith/Y4M4HXXOAIOWN2GGTN4RSMVSR2/bundle.json","state":"https://pith.science/pith/Y4M4HXXOAIOWN2GGTN4RSMVSR2/state.json","well_known_bundle":"https://pith.science/.well-known/pith/Y4M4HXXOAIOWN2GGTN4RSMVSR2/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2018:Y4M4HXXOAIOWN2GGTN4RSMVSR2","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":"e136701cd30280af1baaf8bd4b8818c232c6ff5a013c91657c1ef122f6bb3860","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2018-04-18T06:57:15Z","title_canon_sha256":"579fee7e807094255f8f9242fe9a5378464733344558d24b6d8476460295288f"},"schema_version":"1.0","source":{"id":"1804.06573","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1804.06573","created_at":"2026-05-18T00:02:45Z"},{"alias_kind":"arxiv_version","alias_value":"1804.06573v2","created_at":"2026-05-18T00:02:45Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1804.06573","created_at":"2026-05-18T00:02:45Z"},{"alias_kind":"pith_short_12","alias_value":"Y4M4HXXOAIOW","created_at":"2026-05-18T12:33:04Z"},{"alias_kind":"pith_short_16","alias_value":"Y4M4HXXOAIOWN2GG","created_at":"2026-05-18T12:33:04Z"},{"alias_kind":"pith_short_8","alias_value":"Y4M4HXXO","created_at":"2026-05-18T12:33:04Z"}],"graph_snapshots":[{"event_id":"sha256:9fbe214c5f7e6f133a75879048277a93dc8d14b30950cc9df1effa44d281e068","target":"graph","created_at":"2026-05-18T00:02:45Z","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 present a new method to model spin-wave excitations in magnetic solids, based on the Liouville-Lanczos approach to time-dependent density functional perturbation theory. This method avoids computationally expensive sums over empty states and naturally deals with the coupling between spin and charge fluctuations, without ever explicitly computing charge-density susceptibilities. Spin-wave excitations are obtained with one Lanczos chain per magnon wave-number and polarization, avoiding the solution of the linear-response problem for every individual value of frequency, as other state-of-the-a","authors_text":"Iurii Timrov, Stefano Baroni, Tommaso Gorni","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2018-04-18T06:57:15Z","title":"Spin dynamics from time-dependent density functional perturbation theory"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1804.06573","kind":"arxiv","version":2},"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":"sha256:88d9a4c461e79d7ee4659d9346df1cfc24e6d6798a9d5744b03421a3ff1293d7","target":"record","created_at":"2026-05-18T00:02:45Z","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":"e136701cd30280af1baaf8bd4b8818c232c6ff5a013c91657c1ef122f6bb3860","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2018-04-18T06:57:15Z","title_canon_sha256":"579fee7e807094255f8f9242fe9a5378464733344558d24b6d8476460295288f"},"schema_version":"1.0","source":{"id":"1804.06573","kind":"arxiv","version":2}},"canonical_sha256":"c719c3deee021d66e8c69b791932b28eb9810f9deb3cabd7119bd5217e9710c6","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"c719c3deee021d66e8c69b791932b28eb9810f9deb3cabd7119bd5217e9710c6","first_computed_at":"2026-05-18T00:02:45.016147Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:02:45.016147Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"FyRCZ0tV8JSpYxNLaQSZ6HBMjUOd5JfKpt08MznTfoJ1JrMkuJyZ15LAk6vMlsjl0ACF3QKvi4Xj8kbUYFTXCg==","signature_status":"signed_v1","signed_at":"2026-05-18T00:02:45.016596Z","signed_message":"canonical_sha256_bytes"},"source_id":"1804.06573","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:88d9a4c461e79d7ee4659d9346df1cfc24e6d6798a9d5744b03421a3ff1293d7","sha256:9fbe214c5f7e6f133a75879048277a93dc8d14b30950cc9df1effa44d281e068"],"state_sha256":"a15813d50a6f73779104f1d5d378209ab35cc7a11c5d5115c1d35e773ab27592"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"tUAwYmwvJJ8NPdMXJ5CXl2vt/Fle1GhWW2PWKtewPq2ooDn0Fw7g60VS2JLzGrT2gxd8HGjssNbeNjIpjIEpBw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-23T15:40:15.861256Z","bundle_sha256":"18dfa0e491f396e43bb84273b78bf7793ce4ccfbdd2f7f305605fef6db61efbc"}}