{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2021:EH6Q4AEW2MUZCOWS5BFZ2IOTZC","short_pith_number":"pith:EH6Q4AEW","canonical_record":{"source":{"id":"2108.02824","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"nucl-th","submitted_at":"2021-08-05T19:28:25Z","cross_cats_sorted":["cond-mat.str-el","quant-ph"],"title_canon_sha256":"035679a745cd36da95f4249820d722c1b62019848d43a7fdffc4c0c5396e7a79","abstract_canon_sha256":"fbd00da842809ee6e4cbaf6e4ea170ae2dfb3ddc0524a0d0cd1d6b72525ea6cc"},"schema_version":"1.0"},"canonical_sha256":"21fd0e0096d329913ad2e84b9d21d3c8a5d12a7d8cf489be1c53beb8043096a4","source":{"kind":"arxiv","id":"2108.02824","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2108.02824","created_at":"2026-07-05T04:30:03Z"},{"alias_kind":"arxiv_version","alias_value":"2108.02824v2","created_at":"2026-07-05T04:30:03Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2108.02824","created_at":"2026-07-05T04:30:03Z"},{"alias_kind":"pith_short_12","alias_value":"EH6Q4AEW2MUZ","created_at":"2026-07-05T04:30:03Z"},{"alias_kind":"pith_short_16","alias_value":"EH6Q4AEW2MUZCOWS","created_at":"2026-07-05T04:30:03Z"},{"alias_kind":"pith_short_8","alias_value":"EH6Q4AEW","created_at":"2026-07-05T04:30:03Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2021:EH6Q4AEW2MUZCOWS5BFZ2IOTZC","target":"record","payload":{"canonical_record":{"source":{"id":"2108.02824","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"nucl-th","submitted_at":"2021-08-05T19:28:25Z","cross_cats_sorted":["cond-mat.str-el","quant-ph"],"title_canon_sha256":"035679a745cd36da95f4249820d722c1b62019848d43a7fdffc4c0c5396e7a79","abstract_canon_sha256":"fbd00da842809ee6e4cbaf6e4ea170ae2dfb3ddc0524a0d0cd1d6b72525ea6cc"},"schema_version":"1.0"},"canonical_sha256":"21fd0e0096d329913ad2e84b9d21d3c8a5d12a7d8cf489be1c53beb8043096a4","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T04:30:03.913140Z","signature_b64":"yvpSg03pydvAzZ/mCNaGUwhoO6FNpTA7ikZYtMKrF9haptA+IpwpFUwSJhqt7Wln2/Ti8Q+ps6Kx9NyN3ciiAA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"21fd0e0096d329913ad2e84b9d21d3c8a5d12a7d8cf489be1c53beb8043096a4","last_reissued_at":"2026-07-05T04:30:03.912641Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T04:30:03.912641Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2108.02824","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":"2026-07-05T04:30:03Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"ZkclkvcVmUt9AiyPkDYrwY6nKr58qWbjjwmT+cTRIQe6KNaiF0eSBmxLzmNS1TfmzvdNqZUS/21Khgnw13xMBA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-09T05:11:45.361849Z"},"content_sha256":"9b585f897d5800e0d3aa92ead3c389e6f2bb1cff06ef834ed62398cc38a80386","schema_version":"1.0","event_id":"sha256:9b585f897d5800e0d3aa92ead3c389e6f2bb1cff06ef834ed62398cc38a80386"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2021:EH6Q4AEW2MUZCOWS5BFZ2IOTZC","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Excited states from eigenvector continuation: the anharmonic oscillator","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["cond-mat.str-el","quant-ph"],"primary_cat":"nucl-th","authors_text":"Achim Schwenk, Alexander Tichai, Kai Hebeler, Margarida Companys Franzke","submitted_at":"2021-08-05T19:28:25Z","abstract_excerpt":"Eigenvector continuation (EC) has recently attracted a lot attention in nuclear structure and reactions as a variational resummation tool for many-body expansions. While previous applications focused on ground-state energies, excited states can be accessed on equal footing. This work is dedicated to a detailed understanding of the emergence of excited states from the eigenvector continuation approach. For numerical applications the one-dimensional quartic anharmonic oscillator is investigated, which represents a strongly non-perturbative quantum system where the use of standard perturbation te"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2108.02824","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":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/2108.02824/integrity.json","findings":[],"available":true,"detectors_run":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938"},"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":"2026-07-05T04:30:03Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"xlhTd8xKXzm1VdjKmAbuAfkS51qhS1n61g1xg8uJCZmZAki33dCFaCOJ77DNuuRl9ePJnn6WEcvqDMPiDn3eBQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-09T05:11:45.362378Z"},"content_sha256":"a144de0b46913afba1cf9a504bec363b309d76a9cf47eee2f16aaaf353f8d9af","schema_version":"1.0","event_id":"sha256:a144de0b46913afba1cf9a504bec363b309d76a9cf47eee2f16aaaf353f8d9af"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/EH6Q4AEW2MUZCOWS5BFZ2IOTZC/bundle.json","state_url":"https://pith.science/pith/EH6Q4AEW2MUZCOWS5BFZ2IOTZC/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/EH6Q4AEW2MUZCOWS5BFZ2IOTZC/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":"2026-08-09T05:11:45Z","links":{"resolver":"https://pith.science/pith/EH6Q4AEW2MUZCOWS5BFZ2IOTZC","bundle":"https://pith.science/pith/EH6Q4AEW2MUZCOWS5BFZ2IOTZC/bundle.json","state":"https://pith.science/pith/EH6Q4AEW2MUZCOWS5BFZ2IOTZC/state.json","well_known_bundle":"https://pith.science/.well-known/pith/EH6Q4AEW2MUZCOWS5BFZ2IOTZC/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2021:EH6Q4AEW2MUZCOWS5BFZ2IOTZC","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":"fbd00da842809ee6e4cbaf6e4ea170ae2dfb3ddc0524a0d0cd1d6b72525ea6cc","cross_cats_sorted":["cond-mat.str-el","quant-ph"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"nucl-th","submitted_at":"2021-08-05T19:28:25Z","title_canon_sha256":"035679a745cd36da95f4249820d722c1b62019848d43a7fdffc4c0c5396e7a79"},"schema_version":"1.0","source":{"id":"2108.02824","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2108.02824","created_at":"2026-07-05T04:30:03Z"},{"alias_kind":"arxiv_version","alias_value":"2108.02824v2","created_at":"2026-07-05T04:30:03Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2108.02824","created_at":"2026-07-05T04:30:03Z"},{"alias_kind":"pith_short_12","alias_value":"EH6Q4AEW2MUZ","created_at":"2026-07-05T04:30:03Z"},{"alias_kind":"pith_short_16","alias_value":"EH6Q4AEW2MUZCOWS","created_at":"2026-07-05T04:30:03Z"},{"alias_kind":"pith_short_8","alias_value":"EH6Q4AEW","created_at":"2026-07-05T04:30:03Z"}],"graph_snapshots":[{"event_id":"sha256:a144de0b46913afba1cf9a504bec363b309d76a9cf47eee2f16aaaf353f8d9af","target":"graph","created_at":"2026-07-05T04:30:03Z","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"},"integrity":{"available":true,"clean":true,"detectors_run":[],"endpoint":"/pith/2108.02824/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"Eigenvector continuation (EC) has recently attracted a lot attention in nuclear structure and reactions as a variational resummation tool for many-body expansions. While previous applications focused on ground-state energies, excited states can be accessed on equal footing. This work is dedicated to a detailed understanding of the emergence of excited states from the eigenvector continuation approach. For numerical applications the one-dimensional quartic anharmonic oscillator is investigated, which represents a strongly non-perturbative quantum system where the use of standard perturbation te","authors_text":"Achim Schwenk, Alexander Tichai, Kai Hebeler, Margarida Companys Franzke","cross_cats":["cond-mat.str-el","quant-ph"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"nucl-th","submitted_at":"2021-08-05T19:28:25Z","title":"Excited states from eigenvector continuation: the anharmonic oscillator"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2108.02824","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":"sha256:9b585f897d5800e0d3aa92ead3c389e6f2bb1cff06ef834ed62398cc38a80386","target":"record","created_at":"2026-07-05T04:30:03Z","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":"fbd00da842809ee6e4cbaf6e4ea170ae2dfb3ddc0524a0d0cd1d6b72525ea6cc","cross_cats_sorted":["cond-mat.str-el","quant-ph"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"nucl-th","submitted_at":"2021-08-05T19:28:25Z","title_canon_sha256":"035679a745cd36da95f4249820d722c1b62019848d43a7fdffc4c0c5396e7a79"},"schema_version":"1.0","source":{"id":"2108.02824","kind":"arxiv","version":2}},"canonical_sha256":"21fd0e0096d329913ad2e84b9d21d3c8a5d12a7d8cf489be1c53beb8043096a4","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"21fd0e0096d329913ad2e84b9d21d3c8a5d12a7d8cf489be1c53beb8043096a4","first_computed_at":"2026-07-05T04:30:03.912641Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T04:30:03.912641Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"yvpSg03pydvAzZ/mCNaGUwhoO6FNpTA7ikZYtMKrF9haptA+IpwpFUwSJhqt7Wln2/Ti8Q+ps6Kx9NyN3ciiAA==","signature_status":"signed_v1","signed_at":"2026-07-05T04:30:03.913140Z","signed_message":"canonical_sha256_bytes"},"source_id":"2108.02824","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:9b585f897d5800e0d3aa92ead3c389e6f2bb1cff06ef834ed62398cc38a80386","sha256:a144de0b46913afba1cf9a504bec363b309d76a9cf47eee2f16aaaf353f8d9af"],"state_sha256":"a9d6ae5104572d827d86c39c4b45e347e63cf00ae4396823969b2138cd3e8859"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"SEPqrUvimm+vqNkTHxtEHMZjeXjiuZNVj1SMWiwCz3psCqKagdzrvZGVp6vy4l5GQINPIxtmEnr3c4kR35KICQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-09T05:11:45.371723Z","bundle_sha256":"4c5ed052ab334a8fa8549ccb8d17badd436e3e18f59a07dfba07ace012b0c8e9"}}