{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2008:QEJPONTFIROOWG4OJ4E6KCVB4N","short_pith_number":"pith:QEJPONTF","canonical_record":{"source":{"id":"0809.3389","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2008-09-19T14:44:46Z","cross_cats_sorted":[],"title_canon_sha256":"6f39755c66368a43c345b692325aeda0c33524631649905dac1a2fc979603e0b","abstract_canon_sha256":"818c3d60e23f297a7b72925a3c37696061448346b087aa9226377786ceccf5ee"},"schema_version":"1.0"},"canonical_sha256":"8112f73665445ceb1b8e4f09e50aa1e37b2795a6ccf93266272cb96fa76c17bb","source":{"kind":"arxiv","id":"0809.3389","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"0809.3389","created_at":"2026-05-18T02:15:34Z"},{"alias_kind":"arxiv_version","alias_value":"0809.3389v1","created_at":"2026-05-18T02:15:34Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.0809.3389","created_at":"2026-05-18T02:15:34Z"},{"alias_kind":"pith_short_12","alias_value":"QEJPONTFIROO","created_at":"2026-05-18T12:25:57Z"},{"alias_kind":"pith_short_16","alias_value":"QEJPONTFIROOWG4O","created_at":"2026-05-18T12:25:57Z"},{"alias_kind":"pith_short_8","alias_value":"QEJPONTF","created_at":"2026-05-18T12:25:57Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2008:QEJPONTFIROOWG4OJ4E6KCVB4N","target":"record","payload":{"canonical_record":{"source":{"id":"0809.3389","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2008-09-19T14:44:46Z","cross_cats_sorted":[],"title_canon_sha256":"6f39755c66368a43c345b692325aeda0c33524631649905dac1a2fc979603e0b","abstract_canon_sha256":"818c3d60e23f297a7b72925a3c37696061448346b087aa9226377786ceccf5ee"},"schema_version":"1.0"},"canonical_sha256":"8112f73665445ceb1b8e4f09e50aa1e37b2795a6ccf93266272cb96fa76c17bb","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T02:15:34.192763Z","signature_b64":"qE8Dm05b7ks5pLDibmqdwXKDaHr6mEU2z/mVRP4KiGKQhTb1VMvdd1SpAu7i9CUGoINuQhxhZIqNU065D6rUAg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"8112f73665445ceb1b8e4f09e50aa1e37b2795a6ccf93266272cb96fa76c17bb","last_reissued_at":"2026-05-18T02:15:34.192043Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T02:15:34.192043Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"0809.3389","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":"2026-05-18T02:15:34Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"yzXvnEu1eskJjNQx/3ElczQMdOyv675B8j3XopONURK8AuDyy9A+WHgd+WlN9QMGeyROUjmmLsboAetparRkDQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-27T06:01:20.896907Z"},"content_sha256":"cf6a0045ec4e14d3734a7ff61a33d01985dd5d9d838d20cdce8360242a0fcbe6","schema_version":"1.0","event_id":"sha256:cf6a0045ec4e14d3734a7ff61a33d01985dd5d9d838d20cdce8360242a0fcbe6"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2008:QEJPONTFIROOWG4OJ4E6KCVB4N","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Exciton-plasmon states in nanoscale materials: breakdown of the Tamm-Dancoff approximation","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"cond-mat.mtrl-sci","authors_text":"Andrea Marini, Myrta Gr\\\"uning, Xavier Gonze","submitted_at":"2008-09-19T14:44:46Z","abstract_excerpt":"Within the Tamm-Dancoff approximation ab initio approaches describe excitons as packets of electron-hole pairs propagating only forward in time. However, we show that in nanoscale materials excitons and plasmons hybridize, creating exciton--plasmon states where the electron-hole pairs oscillate back and forth in time. Then, as exemplified by the trans-azobenzene molecule and carbon nanotubes, the Tamm-Dancoff approximation yields errors as large as the accuracy claimed in ab initio calculations. Instead, we propose a general and efficient approach that avoids the Tamm--Dancoff approximation, a"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0809.3389","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":"2026-05-18T02:15:34Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"Ry9WrqGujMjvnhVEJR2f/iFKYI/LIYmSVVJgcAy4aNAHNWZ71Zpfqcf10PwAPPSII+JAbLUGZV58OCA6abQmCQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-27T06:01:20.897524Z"},"content_sha256":"c2cdf98e1c9d76c48aef6fa3a75f147cfe63970814100bc83615996e3bd3cd3a","schema_version":"1.0","event_id":"sha256:c2cdf98e1c9d76c48aef6fa3a75f147cfe63970814100bc83615996e3bd3cd3a"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/QEJPONTFIROOWG4OJ4E6KCVB4N/bundle.json","state_url":"https://pith.science/pith/QEJPONTFIROOWG4OJ4E6KCVB4N/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/QEJPONTFIROOWG4OJ4E6KCVB4N/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":"2026-05-27T06:01:20Z","links":{"resolver":"https://pith.science/pith/QEJPONTFIROOWG4OJ4E6KCVB4N","bundle":"https://pith.science/pith/QEJPONTFIROOWG4OJ4E6KCVB4N/bundle.json","state":"https://pith.science/pith/QEJPONTFIROOWG4OJ4E6KCVB4N/state.json","well_known_bundle":"https://pith.science/.well-known/pith/QEJPONTFIROOWG4OJ4E6KCVB4N/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2008:QEJPONTFIROOWG4OJ4E6KCVB4N","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":"818c3d60e23f297a7b72925a3c37696061448346b087aa9226377786ceccf5ee","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2008-09-19T14:44:46Z","title_canon_sha256":"6f39755c66368a43c345b692325aeda0c33524631649905dac1a2fc979603e0b"},"schema_version":"1.0","source":{"id":"0809.3389","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"0809.3389","created_at":"2026-05-18T02:15:34Z"},{"alias_kind":"arxiv_version","alias_value":"0809.3389v1","created_at":"2026-05-18T02:15:34Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.0809.3389","created_at":"2026-05-18T02:15:34Z"},{"alias_kind":"pith_short_12","alias_value":"QEJPONTFIROO","created_at":"2026-05-18T12:25:57Z"},{"alias_kind":"pith_short_16","alias_value":"QEJPONTFIROOWG4O","created_at":"2026-05-18T12:25:57Z"},{"alias_kind":"pith_short_8","alias_value":"QEJPONTF","created_at":"2026-05-18T12:25:57Z"}],"graph_snapshots":[{"event_id":"sha256:c2cdf98e1c9d76c48aef6fa3a75f147cfe63970814100bc83615996e3bd3cd3a","target":"graph","created_at":"2026-05-18T02:15:34Z","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":"Within the Tamm-Dancoff approximation ab initio approaches describe excitons as packets of electron-hole pairs propagating only forward in time. However, we show that in nanoscale materials excitons and plasmons hybridize, creating exciton--plasmon states where the electron-hole pairs oscillate back and forth in time. Then, as exemplified by the trans-azobenzene molecule and carbon nanotubes, the Tamm-Dancoff approximation yields errors as large as the accuracy claimed in ab initio calculations. Instead, we propose a general and efficient approach that avoids the Tamm--Dancoff approximation, a","authors_text":"Andrea Marini, Myrta Gr\\\"uning, Xavier Gonze","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2008-09-19T14:44:46Z","title":"Exciton-plasmon states in nanoscale materials: breakdown of the Tamm-Dancoff approximation"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0809.3389","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:cf6a0045ec4e14d3734a7ff61a33d01985dd5d9d838d20cdce8360242a0fcbe6","target":"record","created_at":"2026-05-18T02:15:34Z","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":"818c3d60e23f297a7b72925a3c37696061448346b087aa9226377786ceccf5ee","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2008-09-19T14:44:46Z","title_canon_sha256":"6f39755c66368a43c345b692325aeda0c33524631649905dac1a2fc979603e0b"},"schema_version":"1.0","source":{"id":"0809.3389","kind":"arxiv","version":1}},"canonical_sha256":"8112f73665445ceb1b8e4f09e50aa1e37b2795a6ccf93266272cb96fa76c17bb","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"8112f73665445ceb1b8e4f09e50aa1e37b2795a6ccf93266272cb96fa76c17bb","first_computed_at":"2026-05-18T02:15:34.192043Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T02:15:34.192043Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"qE8Dm05b7ks5pLDibmqdwXKDaHr6mEU2z/mVRP4KiGKQhTb1VMvdd1SpAu7i9CUGoINuQhxhZIqNU065D6rUAg==","signature_status":"signed_v1","signed_at":"2026-05-18T02:15:34.192763Z","signed_message":"canonical_sha256_bytes"},"source_id":"0809.3389","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:cf6a0045ec4e14d3734a7ff61a33d01985dd5d9d838d20cdce8360242a0fcbe6","sha256:c2cdf98e1c9d76c48aef6fa3a75f147cfe63970814100bc83615996e3bd3cd3a"],"state_sha256":"7a81f1766597ae88ea68dca74348e41af3d498f038b7b5f4951bc92ce92000bb"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"d4MG5+DfAqmkNZiOM+qYUPLMqMdafIYNYGKnl8juaNYRBJJTTjskvHW2bhOF3ZUNDCnvklqZi8wuwiFX/CYhCg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-27T06:01:20.900711Z","bundle_sha256":"85b97b587ece2dc857ec1541708e6e2c4917515927918942aa8c5ca549e92504"}}