{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2021:3YZYX5FHRGRVFMU2DODQU7I42V","short_pith_number":"pith:3YZYX5FH","canonical_record":{"source":{"id":"2103.04726","kind":"arxiv","version":3},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2021-03-08T13:01:16Z","cross_cats_sorted":["cond-mat.str-el"],"title_canon_sha256":"42f8eb1c8e784a6f20a8429d6f83292d702324c74e0f8c76b5977414169cfebb","abstract_canon_sha256":"33f1af3e7f56c8db468be63558ceecc8d6cb12c8198cb1e065a190fccb15c0d9"},"schema_version":"1.0"},"canonical_sha256":"de338bf4a789a352b29a1b870a7d1cd56adad3d8d62a821e6d07cb752217f93f","source":{"kind":"arxiv","id":"2103.04726","version":3},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2103.04726","created_at":"2026-07-05T02:48:21Z"},{"alias_kind":"arxiv_version","alias_value":"2103.04726v3","created_at":"2026-07-05T02:48:21Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2103.04726","created_at":"2026-07-05T02:48:21Z"},{"alias_kind":"pith_short_12","alias_value":"3YZYX5FHRGRV","created_at":"2026-07-05T02:48:21Z"},{"alias_kind":"pith_short_16","alias_value":"3YZYX5FHRGRVFMU2","created_at":"2026-07-05T02:48:21Z"},{"alias_kind":"pith_short_8","alias_value":"3YZYX5FH","created_at":"2026-07-05T02:48:21Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2021:3YZYX5FHRGRVFMU2DODQU7I42V","target":"record","payload":{"canonical_record":{"source":{"id":"2103.04726","kind":"arxiv","version":3},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2021-03-08T13:01:16Z","cross_cats_sorted":["cond-mat.str-el"],"title_canon_sha256":"42f8eb1c8e784a6f20a8429d6f83292d702324c74e0f8c76b5977414169cfebb","abstract_canon_sha256":"33f1af3e7f56c8db468be63558ceecc8d6cb12c8198cb1e065a190fccb15c0d9"},"schema_version":"1.0"},"canonical_sha256":"de338bf4a789a352b29a1b870a7d1cd56adad3d8d62a821e6d07cb752217f93f","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T02:48:21.955548Z","signature_b64":"Vkx7HOwAckOJ1CRoODc9B5ODrQ7KkKZo62Gd0w7oMy5RKsBVPkp16clEGgIYrhqgjA9EYv9679LRzC23hX8GBA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"de338bf4a789a352b29a1b870a7d1cd56adad3d8d62a821e6d07cb752217f93f","last_reissued_at":"2026-07-05T02:48:21.955106Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T02:48:21.955106Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2103.04726","source_version":3,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-07-05T02:48:21Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"+emP3qA8zyenCNHwk4CC5qMUghYA9RctSIuDE3k9yjDgvXCzQXm3wJ2IFT4JbFiQk1uzO4mfEGPj60E92v08Ag==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-18T11:26:48.504282Z"},"content_sha256":"48b08cdc88ef4938fb9778604f28a273219482676c0d06b3bc06ea4b22af01d8","schema_version":"1.0","event_id":"sha256:48b08cdc88ef4938fb9778604f28a273219482676c0d06b3bc06ea4b22af01d8"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2021:3YZYX5FHRGRVFMU2DODQU7I42V","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Exchange constants for local spin Hamiltonians from tight-binding models","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["cond-mat.str-el"],"primary_cat":"cond-mat.mtrl-sci","authors_text":"Anders Bergman, Anna Delin, Attila Szilva, Danny Thonig, Erik Sj\\\"oqvist, Manuel Pereiro, Mikhail I. Katsnelson, Olle Eriksson, Simon Streib, Vladislav Borisov","submitted_at":"2021-03-08T13:01:16Z","abstract_excerpt":"We consider the mapping of tight-binding electronic structure theory to a local spin Hamiltonian, based on the adiabatic approximation for spin degrees of freedom in itinerant-electron systems. Local spin Hamiltonians are introduced in order to describe the energy landscape of small magnetic fluctuations, locally around a given spin configuration. They are designed for linear response near a given magnetic state and in general insufficient to capture arbitrarily strong deviations of spin configurations from the equilibrium. In order to achieve this mapping, we include a linear term in the loca"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2103.04726","kind":"arxiv","version":3},"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/2103.04726/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":"2026-07-05T02:48:21Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"ru0CI0K+eAqdovZzG3WMN/ieORxHq/kDPPQDcO9YNPN5s2wOa+zsLOQKoXhkLlJBcvLrT6xyMF9epJ9WVmFsBw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-18T11:26:48.504779Z"},"content_sha256":"97b653762d6bfb685c89883daea997e591f68bcbe314c9720fa3a708ec6db9b0","schema_version":"1.0","event_id":"sha256:97b653762d6bfb685c89883daea997e591f68bcbe314c9720fa3a708ec6db9b0"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/3YZYX5FHRGRVFMU2DODQU7I42V/bundle.json","state_url":"https://pith.science/pith/3YZYX5FHRGRVFMU2DODQU7I42V/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/3YZYX5FHRGRVFMU2DODQU7I42V/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":"2026-08-18T11:26:48Z","links":{"resolver":"https://pith.science/pith/3YZYX5FHRGRVFMU2DODQU7I42V","bundle":"https://pith.science/pith/3YZYX5FHRGRVFMU2DODQU7I42V/bundle.json","state":"https://pith.science/pith/3YZYX5FHRGRVFMU2DODQU7I42V/state.json","well_known_bundle":"https://pith.science/.well-known/pith/3YZYX5FHRGRVFMU2DODQU7I42V/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2021:3YZYX5FHRGRVFMU2DODQU7I42V","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":"33f1af3e7f56c8db468be63558ceecc8d6cb12c8198cb1e065a190fccb15c0d9","cross_cats_sorted":["cond-mat.str-el"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2021-03-08T13:01:16Z","title_canon_sha256":"42f8eb1c8e784a6f20a8429d6f83292d702324c74e0f8c76b5977414169cfebb"},"schema_version":"1.0","source":{"id":"2103.04726","kind":"arxiv","version":3}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2103.04726","created_at":"2026-07-05T02:48:21Z"},{"alias_kind":"arxiv_version","alias_value":"2103.04726v3","created_at":"2026-07-05T02:48:21Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2103.04726","created_at":"2026-07-05T02:48:21Z"},{"alias_kind":"pith_short_12","alias_value":"3YZYX5FHRGRV","created_at":"2026-07-05T02:48:21Z"},{"alias_kind":"pith_short_16","alias_value":"3YZYX5FHRGRVFMU2","created_at":"2026-07-05T02:48:21Z"},{"alias_kind":"pith_short_8","alias_value":"3YZYX5FH","created_at":"2026-07-05T02:48:21Z"}],"graph_snapshots":[{"event_id":"sha256:97b653762d6bfb685c89883daea997e591f68bcbe314c9720fa3a708ec6db9b0","target":"graph","created_at":"2026-07-05T02:48:21Z","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/2103.04726/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"We consider the mapping of tight-binding electronic structure theory to a local spin Hamiltonian, based on the adiabatic approximation for spin degrees of freedom in itinerant-electron systems. Local spin Hamiltonians are introduced in order to describe the energy landscape of small magnetic fluctuations, locally around a given spin configuration. They are designed for linear response near a given magnetic state and in general insufficient to capture arbitrarily strong deviations of spin configurations from the equilibrium. In order to achieve this mapping, we include a linear term in the loca","authors_text":"Anders Bergman, Anna Delin, Attila Szilva, Danny Thonig, Erik Sj\\\"oqvist, Manuel Pereiro, Mikhail I. Katsnelson, Olle Eriksson, Simon Streib, Vladislav Borisov","cross_cats":["cond-mat.str-el"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2021-03-08T13:01:16Z","title":"Exchange constants for local spin Hamiltonians from tight-binding models"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2103.04726","kind":"arxiv","version":3},"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":"sha256:48b08cdc88ef4938fb9778604f28a273219482676c0d06b3bc06ea4b22af01d8","target":"record","created_at":"2026-07-05T02:48:21Z","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":"33f1af3e7f56c8db468be63558ceecc8d6cb12c8198cb1e065a190fccb15c0d9","cross_cats_sorted":["cond-mat.str-el"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2021-03-08T13:01:16Z","title_canon_sha256":"42f8eb1c8e784a6f20a8429d6f83292d702324c74e0f8c76b5977414169cfebb"},"schema_version":"1.0","source":{"id":"2103.04726","kind":"arxiv","version":3}},"canonical_sha256":"de338bf4a789a352b29a1b870a7d1cd56adad3d8d62a821e6d07cb752217f93f","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"de338bf4a789a352b29a1b870a7d1cd56adad3d8d62a821e6d07cb752217f93f","first_computed_at":"2026-07-05T02:48:21.955106Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T02:48:21.955106Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"Vkx7HOwAckOJ1CRoODc9B5ODrQ7KkKZo62Gd0w7oMy5RKsBVPkp16clEGgIYrhqgjA9EYv9679LRzC23hX8GBA==","signature_status":"signed_v1","signed_at":"2026-07-05T02:48:21.955548Z","signed_message":"canonical_sha256_bytes"},"source_id":"2103.04726","source_kind":"arxiv","source_version":3}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:48b08cdc88ef4938fb9778604f28a273219482676c0d06b3bc06ea4b22af01d8","sha256:97b653762d6bfb685c89883daea997e591f68bcbe314c9720fa3a708ec6db9b0"],"state_sha256":"bd12493382ac879c5945759bf9ec49acc7d081876faa837293f077f0d9c1356d"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"bIpVDD+mnWGar/dhksIlw5p6sG9CewO1HaC/Q1GBTwVn9juef9pjW6xxnsln1WikX7zTRVJFeuPplCYeDPjdCw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-18T11:26:48.508482Z","bundle_sha256":"4888fe73f70b5ffb370a9bae715e1f5fbe0123771d9154ed917f90a556d323f7"}}