{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2009:GPSCPMYUNUSSKR4BKD5C5X3AYZ","short_pith_number":"pith:GPSCPMYU","canonical_record":{"source":{"id":"0908.2900","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mes-hall","submitted_at":"2009-08-20T10:45:38Z","cross_cats_sorted":["physics.chem-ph"],"title_canon_sha256":"9eb6e77300fe0589d7ecfdd9fa7e646c5d63c3c06d4707cce93ddf59caa21a56","abstract_canon_sha256":"54ab0c8e294d08cc0730fd23627bc53dc81de4815ed938fe8bc82db23ae14c1b"},"schema_version":"1.0"},"canonical_sha256":"33e427b3146d2525478150fa2edf60c67f5059aea3fd897ea6968f958bf57f9f","source":{"kind":"arxiv","id":"0908.2900","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"0908.2900","created_at":"2026-05-18T02:12:24Z"},{"alias_kind":"arxiv_version","alias_value":"0908.2900v1","created_at":"2026-05-18T02:12:24Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.0908.2900","created_at":"2026-05-18T02:12:24Z"},{"alias_kind":"pith_short_12","alias_value":"GPSCPMYUNUSS","created_at":"2026-05-18T12:25:59Z"},{"alias_kind":"pith_short_16","alias_value":"GPSCPMYUNUSSKR4B","created_at":"2026-05-18T12:25:59Z"},{"alias_kind":"pith_short_8","alias_value":"GPSCPMYU","created_at":"2026-05-18T12:25:59Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2009:GPSCPMYUNUSSKR4BKD5C5X3AYZ","target":"record","payload":{"canonical_record":{"source":{"id":"0908.2900","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mes-hall","submitted_at":"2009-08-20T10:45:38Z","cross_cats_sorted":["physics.chem-ph"],"title_canon_sha256":"9eb6e77300fe0589d7ecfdd9fa7e646c5d63c3c06d4707cce93ddf59caa21a56","abstract_canon_sha256":"54ab0c8e294d08cc0730fd23627bc53dc81de4815ed938fe8bc82db23ae14c1b"},"schema_version":"1.0"},"canonical_sha256":"33e427b3146d2525478150fa2edf60c67f5059aea3fd897ea6968f958bf57f9f","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T02:12:24.807472Z","signature_b64":"UZNuEx2AJyezQd4SdDkJurICEti9bNDLx2v0lywW1hgoLoDJEqddMtbkwz3jzaxmSoRPjla7d9fHgmZ0twT/DQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"33e427b3146d2525478150fa2edf60c67f5059aea3fd897ea6968f958bf57f9f","last_reissued_at":"2026-05-18T02:12:24.806645Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T02:12:24.806645Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"0908.2900","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":"2026-05-18T02:12:24Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"4fW4wH6vyIJ7DmxNtyjNkFPZE8tIvZup/y4zrRP08j7Y4z9K/pRNQxX1AlVvd0JM6mDcJWbVo/5zrNk7KaPLDw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-25T23:13:21.587080Z"},"content_sha256":"762e3e4cf2c357515a4535261da2ef20cff20b4e6b7e3d44ad2d5cb8a3c4dde1","schema_version":"1.0","event_id":"sha256:762e3e4cf2c357515a4535261da2ef20cff20b4e6b7e3d44ad2d5cb8a3c4dde1"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2009:GPSCPMYUNUSSKR4BKD5C5X3AYZ","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Exact-exchange kernel of time-dependent density functional theory: Frequency dependence and photoabsorption spectra of atoms","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["physics.chem-ph"],"primary_cat":"cond-mat.mes-hall","authors_text":"Maria Hellgren, Ulf von Barth","submitted_at":"2009-08-20T10:45:38Z","abstract_excerpt":"In this work we have calculated excitation energies and photoionization cross sections of Be and Ne in the exact-exchange (EXX) approximation of time-dependent density functional theory (TDDFT). The main focus has been on the frequency dependence of the EXX kernel and on how it affects the spectrum as compared to the corresponding adiabatic approximation. We show that for some discrete excitation energies the frequency dependence is essential to reproduce the results of time-dependent Hartree-Fock theory. Unfortunately, we have found that the EXX approximation breaks down completely at higher "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0908.2900","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":"2026-05-18T02:12:24Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"VXCmepRn60hpbyNTLjEqpM1bZT4DAHXH9J9DuhiodY1hqP9Hevw76MAGxLbjQKOvZcTup0Fx9EQmOrh8BKPRAg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-25T23:13:21.587827Z"},"content_sha256":"2163d2bcbad00297f2c37e736640802943bae4a2f23cf2259e7289f0cbb56099","schema_version":"1.0","event_id":"sha256:2163d2bcbad00297f2c37e736640802943bae4a2f23cf2259e7289f0cbb56099"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/GPSCPMYUNUSSKR4BKD5C5X3AYZ/bundle.json","state_url":"https://pith.science/pith/GPSCPMYUNUSSKR4BKD5C5X3AYZ/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/GPSCPMYUNUSSKR4BKD5C5X3AYZ/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":"2026-05-25T23:13:21Z","links":{"resolver":"https://pith.science/pith/GPSCPMYUNUSSKR4BKD5C5X3AYZ","bundle":"https://pith.science/pith/GPSCPMYUNUSSKR4BKD5C5X3AYZ/bundle.json","state":"https://pith.science/pith/GPSCPMYUNUSSKR4BKD5C5X3AYZ/state.json","well_known_bundle":"https://pith.science/.well-known/pith/GPSCPMYUNUSSKR4BKD5C5X3AYZ/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2009:GPSCPMYUNUSSKR4BKD5C5X3AYZ","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":"54ab0c8e294d08cc0730fd23627bc53dc81de4815ed938fe8bc82db23ae14c1b","cross_cats_sorted":["physics.chem-ph"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mes-hall","submitted_at":"2009-08-20T10:45:38Z","title_canon_sha256":"9eb6e77300fe0589d7ecfdd9fa7e646c5d63c3c06d4707cce93ddf59caa21a56"},"schema_version":"1.0","source":{"id":"0908.2900","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"0908.2900","created_at":"2026-05-18T02:12:24Z"},{"alias_kind":"arxiv_version","alias_value":"0908.2900v1","created_at":"2026-05-18T02:12:24Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.0908.2900","created_at":"2026-05-18T02:12:24Z"},{"alias_kind":"pith_short_12","alias_value":"GPSCPMYUNUSS","created_at":"2026-05-18T12:25:59Z"},{"alias_kind":"pith_short_16","alias_value":"GPSCPMYUNUSSKR4B","created_at":"2026-05-18T12:25:59Z"},{"alias_kind":"pith_short_8","alias_value":"GPSCPMYU","created_at":"2026-05-18T12:25:59Z"}],"graph_snapshots":[{"event_id":"sha256:2163d2bcbad00297f2c37e736640802943bae4a2f23cf2259e7289f0cbb56099","target":"graph","created_at":"2026-05-18T02:12:24Z","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":"In this work we have calculated excitation energies and photoionization cross sections of Be and Ne in the exact-exchange (EXX) approximation of time-dependent density functional theory (TDDFT). The main focus has been on the frequency dependence of the EXX kernel and on how it affects the spectrum as compared to the corresponding adiabatic approximation. We show that for some discrete excitation energies the frequency dependence is essential to reproduce the results of time-dependent Hartree-Fock theory. Unfortunately, we have found that the EXX approximation breaks down completely at higher ","authors_text":"Maria Hellgren, Ulf von Barth","cross_cats":["physics.chem-ph"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mes-hall","submitted_at":"2009-08-20T10:45:38Z","title":"Exact-exchange kernel of time-dependent density functional theory: Frequency dependence and photoabsorption spectra of atoms"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0908.2900","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":"sha256:762e3e4cf2c357515a4535261da2ef20cff20b4e6b7e3d44ad2d5cb8a3c4dde1","target":"record","created_at":"2026-05-18T02:12:24Z","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":"54ab0c8e294d08cc0730fd23627bc53dc81de4815ed938fe8bc82db23ae14c1b","cross_cats_sorted":["physics.chem-ph"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mes-hall","submitted_at":"2009-08-20T10:45:38Z","title_canon_sha256":"9eb6e77300fe0589d7ecfdd9fa7e646c5d63c3c06d4707cce93ddf59caa21a56"},"schema_version":"1.0","source":{"id":"0908.2900","kind":"arxiv","version":1}},"canonical_sha256":"33e427b3146d2525478150fa2edf60c67f5059aea3fd897ea6968f958bf57f9f","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"33e427b3146d2525478150fa2edf60c67f5059aea3fd897ea6968f958bf57f9f","first_computed_at":"2026-05-18T02:12:24.806645Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T02:12:24.806645Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"UZNuEx2AJyezQd4SdDkJurICEti9bNDLx2v0lywW1hgoLoDJEqddMtbkwz3jzaxmSoRPjla7d9fHgmZ0twT/DQ==","signature_status":"signed_v1","signed_at":"2026-05-18T02:12:24.807472Z","signed_message":"canonical_sha256_bytes"},"source_id":"0908.2900","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:762e3e4cf2c357515a4535261da2ef20cff20b4e6b7e3d44ad2d5cb8a3c4dde1","sha256:2163d2bcbad00297f2c37e736640802943bae4a2f23cf2259e7289f0cbb56099"],"state_sha256":"f38fe067593101dab51cdad43b3ea8f8bea730fff979632fae845a08a0d03528"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"zkngK7lvVeKNPxq1/CYL7ciNsaaWD1JFKljNuPNR3igR5Xqw6zE0VYCjDNugl02JXtP3gDE/VNmv5zP7+UheCg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-25T23:13:21.591942Z","bundle_sha256":"210cf95d4c2aab520672e69beeabf3ee81beb1a8b48b5107f5b3d0a385cd5394"}}