{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2017:KRRMXCWKGZ7Y5UYT4DVXCK7FRH","short_pith_number":"pith:KRRMXCWK","canonical_record":{"source":{"id":"1705.05423","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.str-el","submitted_at":"2017-05-15T19:49:20Z","cross_cats_sorted":[],"title_canon_sha256":"935e6c0580d055734afffe3d4b07b4cf637b6044dec96817211644c8d8d54c70","abstract_canon_sha256":"8547bbde8a88d8eab021c4b7a56a3f4b8664d47fda7da806d565c79d9e75a165"},"schema_version":"1.0"},"canonical_sha256":"5462cb8aca367f8ed313e0eb712be589f808c6bc286efd232dfe4fab9e246903","source":{"kind":"arxiv","id":"1705.05423","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1705.05423","created_at":"2026-05-18T00:36:52Z"},{"alias_kind":"arxiv_version","alias_value":"1705.05423v2","created_at":"2026-05-18T00:36:52Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1705.05423","created_at":"2026-05-18T00:36:52Z"},{"alias_kind":"pith_short_12","alias_value":"KRRMXCWKGZ7Y","created_at":"2026-05-18T12:31:28Z"},{"alias_kind":"pith_short_16","alias_value":"KRRMXCWKGZ7Y5UYT","created_at":"2026-05-18T12:31:28Z"},{"alias_kind":"pith_short_8","alias_value":"KRRMXCWK","created_at":"2026-05-18T12:31:28Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2017:KRRMXCWKGZ7Y5UYT4DVXCK7FRH","target":"record","payload":{"canonical_record":{"source":{"id":"1705.05423","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.str-el","submitted_at":"2017-05-15T19:49:20Z","cross_cats_sorted":[],"title_canon_sha256":"935e6c0580d055734afffe3d4b07b4cf637b6044dec96817211644c8d8d54c70","abstract_canon_sha256":"8547bbde8a88d8eab021c4b7a56a3f4b8664d47fda7da806d565c79d9e75a165"},"schema_version":"1.0"},"canonical_sha256":"5462cb8aca367f8ed313e0eb712be589f808c6bc286efd232dfe4fab9e246903","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T00:36:52.155051Z","signature_b64":"wstS16VSigyt016vbxMlX+FJHs4ZAjx7olSDeYwceO3CEOk1goanEF+HLC3myhg37YSRNQ/5cQQ6paEmIzwQCg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"5462cb8aca367f8ed313e0eb712be589f808c6bc286efd232dfe4fab9e246903","last_reissued_at":"2026-05-18T00:36:52.154497Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T00:36:52.154497Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1705.05423","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":"2026-05-18T00:36:52Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"PJ2/MHUTu6Z9jGnmeIeNbsnXvKOWHRrmXj28ux3JvAjJ4tdV8Rr7gqi5eaUR6yVYDQwOm6J7bqnBzi77QONtCg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-05T16:47:23.778112Z"},"content_sha256":"1a951488224e76823872ee70d7bc4c00663c780a0a0dc283ac36dae511b7ded2","schema_version":"1.0","event_id":"sha256:1a951488224e76823872ee70d7bc4c00663c780a0a0dc283ac36dae511b7ded2"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2017:KRRMXCWKGZ7Y5UYT4DVXCK7FRH","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Excitation spectrum and Density Matrix Renormalization Group iterations","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"cond-mat.str-el","authors_text":"Fr\\'ed\\'eric Mila, Natalia Chepiga","submitted_at":"2017-05-15T19:49:20Z","abstract_excerpt":"We show that, in certain circumstances, exact excitation energies appear as locally site-independent (or flat) modes if one records the excitation spectrum of the effective Hamiltonian while sweeping through the lattice in the variational Matrix Product State formulation of the Density Matrix Renormalization Group (DMRG), a remarkable property since the effective Hamiltonian is only constructed to target the ground state. Conversely, modes that are very flat over several consecutive iterations are systematically found to correspond to faithful excitations. We suggest to use this property to ex"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1705.05423","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":"2026-05-18T00:36:52Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"mJz5/fFTz4aIiIz9Opq/7pSx2h5amdDxNh0FBXWq0uBJxnp6b7qsMzuL8bH40hi1n4JPyqEg5PEF1uOT0W7TAg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-05T16:47:23.778487Z"},"content_sha256":"71ece866de2c597625b0444e8fe035c7f0a42f43ae729875d4936d8e2fffa9bd","schema_version":"1.0","event_id":"sha256:71ece866de2c597625b0444e8fe035c7f0a42f43ae729875d4936d8e2fffa9bd"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/KRRMXCWKGZ7Y5UYT4DVXCK7FRH/bundle.json","state_url":"https://pith.science/pith/KRRMXCWKGZ7Y5UYT4DVXCK7FRH/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/KRRMXCWKGZ7Y5UYT4DVXCK7FRH/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":"2026-06-05T16:47:23Z","links":{"resolver":"https://pith.science/pith/KRRMXCWKGZ7Y5UYT4DVXCK7FRH","bundle":"https://pith.science/pith/KRRMXCWKGZ7Y5UYT4DVXCK7FRH/bundle.json","state":"https://pith.science/pith/KRRMXCWKGZ7Y5UYT4DVXCK7FRH/state.json","well_known_bundle":"https://pith.science/.well-known/pith/KRRMXCWKGZ7Y5UYT4DVXCK7FRH/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2017:KRRMXCWKGZ7Y5UYT4DVXCK7FRH","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":"8547bbde8a88d8eab021c4b7a56a3f4b8664d47fda7da806d565c79d9e75a165","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.str-el","submitted_at":"2017-05-15T19:49:20Z","title_canon_sha256":"935e6c0580d055734afffe3d4b07b4cf637b6044dec96817211644c8d8d54c70"},"schema_version":"1.0","source":{"id":"1705.05423","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1705.05423","created_at":"2026-05-18T00:36:52Z"},{"alias_kind":"arxiv_version","alias_value":"1705.05423v2","created_at":"2026-05-18T00:36:52Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1705.05423","created_at":"2026-05-18T00:36:52Z"},{"alias_kind":"pith_short_12","alias_value":"KRRMXCWKGZ7Y","created_at":"2026-05-18T12:31:28Z"},{"alias_kind":"pith_short_16","alias_value":"KRRMXCWKGZ7Y5UYT","created_at":"2026-05-18T12:31:28Z"},{"alias_kind":"pith_short_8","alias_value":"KRRMXCWK","created_at":"2026-05-18T12:31:28Z"}],"graph_snapshots":[{"event_id":"sha256:71ece866de2c597625b0444e8fe035c7f0a42f43ae729875d4936d8e2fffa9bd","target":"graph","created_at":"2026-05-18T00:36:52Z","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 show that, in certain circumstances, exact excitation energies appear as locally site-independent (or flat) modes if one records the excitation spectrum of the effective Hamiltonian while sweeping through the lattice in the variational Matrix Product State formulation of the Density Matrix Renormalization Group (DMRG), a remarkable property since the effective Hamiltonian is only constructed to target the ground state. Conversely, modes that are very flat over several consecutive iterations are systematically found to correspond to faithful excitations. We suggest to use this property to ex","authors_text":"Fr\\'ed\\'eric Mila, Natalia Chepiga","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.str-el","submitted_at":"2017-05-15T19:49:20Z","title":"Excitation spectrum and Density Matrix Renormalization Group iterations"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1705.05423","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":"sha256:1a951488224e76823872ee70d7bc4c00663c780a0a0dc283ac36dae511b7ded2","target":"record","created_at":"2026-05-18T00:36:52Z","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":"8547bbde8a88d8eab021c4b7a56a3f4b8664d47fda7da806d565c79d9e75a165","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.str-el","submitted_at":"2017-05-15T19:49:20Z","title_canon_sha256":"935e6c0580d055734afffe3d4b07b4cf637b6044dec96817211644c8d8d54c70"},"schema_version":"1.0","source":{"id":"1705.05423","kind":"arxiv","version":2}},"canonical_sha256":"5462cb8aca367f8ed313e0eb712be589f808c6bc286efd232dfe4fab9e246903","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"5462cb8aca367f8ed313e0eb712be589f808c6bc286efd232dfe4fab9e246903","first_computed_at":"2026-05-18T00:36:52.154497Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:36:52.154497Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"wstS16VSigyt016vbxMlX+FJHs4ZAjx7olSDeYwceO3CEOk1goanEF+HLC3myhg37YSRNQ/5cQQ6paEmIzwQCg==","signature_status":"signed_v1","signed_at":"2026-05-18T00:36:52.155051Z","signed_message":"canonical_sha256_bytes"},"source_id":"1705.05423","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:1a951488224e76823872ee70d7bc4c00663c780a0a0dc283ac36dae511b7ded2","sha256:71ece866de2c597625b0444e8fe035c7f0a42f43ae729875d4936d8e2fffa9bd"],"state_sha256":"8236a0b609c46ca9c79cc729811ceb3a104555e13c93236c75619792e32db72c"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"RcbjmhK0UU1818oOw/Z0W4FjX7R8/ly8MGY8h/QFPkV5c/nWTOVTt7eom04Of5CklVLA3klSWtGIVWkX4dt/Cw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-05T16:47:23.780825Z","bundle_sha256":"0d939a055d3b92dcf48acd86da1f28870129067217e400f29285fba01e35b978"}}