{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2013:DAZY5URCAYYPV2YYWLHVATVX55","short_pith_number":"pith:DAZY5URC","canonical_record":{"source":{"id":"1302.5232","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2013-02-21T09:58:16Z","cross_cats_sorted":[],"title_canon_sha256":"a9b31534484be8c7fea315d130fbf51f7101387e3561c60eb2ddd6afd77abec8","abstract_canon_sha256":"ca1b33bf11384e3c11a0e317311ed146e66a012db7a5e72d763533b1eb811851"},"schema_version":"1.0"},"canonical_sha256":"18338ed2220630faeb18b2cf504eb7ef6f3c251d995702f0dff030ecba4e3cff","source":{"kind":"arxiv","id":"1302.5232","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1302.5232","created_at":"2026-05-18T01:51:34Z"},{"alias_kind":"arxiv_version","alias_value":"1302.5232v1","created_at":"2026-05-18T01:51:34Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1302.5232","created_at":"2026-05-18T01:51:34Z"},{"alias_kind":"pith_short_12","alias_value":"DAZY5URCAYYP","created_at":"2026-05-18T12:27:40Z"},{"alias_kind":"pith_short_16","alias_value":"DAZY5URCAYYPV2YY","created_at":"2026-05-18T12:27:40Z"},{"alias_kind":"pith_short_8","alias_value":"DAZY5URC","created_at":"2026-05-18T12:27:40Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2013:DAZY5URCAYYPV2YYWLHVATVX55","target":"record","payload":{"canonical_record":{"source":{"id":"1302.5232","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2013-02-21T09:58:16Z","cross_cats_sorted":[],"title_canon_sha256":"a9b31534484be8c7fea315d130fbf51f7101387e3561c60eb2ddd6afd77abec8","abstract_canon_sha256":"ca1b33bf11384e3c11a0e317311ed146e66a012db7a5e72d763533b1eb811851"},"schema_version":"1.0"},"canonical_sha256":"18338ed2220630faeb18b2cf504eb7ef6f3c251d995702f0dff030ecba4e3cff","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:51:34.571413Z","signature_b64":"nEGaZf1zruDKi3/NFO9JwidSAQ5pcUGH+DMipNx6HaZEEoZ6UruDXupxTN7Y6dSSKWEws2EeaLP2vRscYZKiAA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"18338ed2220630faeb18b2cf504eb7ef6f3c251d995702f0dff030ecba4e3cff","last_reissued_at":"2026-05-18T01:51:34.570921Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:51:34.570921Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1302.5232","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":"2026-05-18T01:51:34Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"sMTw2rQZ3/J+SEQHef5rKoJOc/BBXcIU3iWrDVqieLEroQTwP7vzV5axA1so695FUllliK6akSZx1mfvM8LIAQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-04T10:01:54.623550Z"},"content_sha256":"552763961e0afe357e65457b5c4081f5ac6120322b15e65145baa0462d16997a","schema_version":"1.0","event_id":"sha256:552763961e0afe357e65457b5c4081f5ac6120322b15e65145baa0462d16997a"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2013:DAZY5URCAYYPV2YYWLHVATVX55","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Quantum entanglement at negative temperature","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"quant-ph","authors_text":"G.B. Furman, V.L. Sokolovsky, V. M. Meerovich","submitted_at":"2013-02-21T09:58:16Z","abstract_excerpt":"An isolated spin system that is in internal thermodynamic equilibrium and that has an upper limit to its allowed energy states can possess a negative temperature. We calculate the thermodynamic characteristics and the concurrence in this system over the entire range of positive and negative temperatures. Our calculation was performed for different real structures, which can be used in experiments. It is found that the temperature dependence of the concurrence is substantially asymmetrical similarly other thermodynamic characteristics. At a negative temperature the maximum concurrence and the a"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1302.5232","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":"2026-05-18T01:51:34Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"NhnpiKWjlV6BrteqYUtM7cByEgFqx49G4I7iSGWDSPicR2/fjVniiJ/Wivoo32SH+ftUrwoEp+srtWuxlKp+DQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-04T10:01:54.623897Z"},"content_sha256":"f09a0494321defa8c95d5ee13002125983702e0c03ba42d568ea5ca85d42e2a9","schema_version":"1.0","event_id":"sha256:f09a0494321defa8c95d5ee13002125983702e0c03ba42d568ea5ca85d42e2a9"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/DAZY5URCAYYPV2YYWLHVATVX55/bundle.json","state_url":"https://pith.science/pith/DAZY5URCAYYPV2YYWLHVATVX55/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/DAZY5URCAYYPV2YYWLHVATVX55/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":"2026-06-04T10:01:54Z","links":{"resolver":"https://pith.science/pith/DAZY5URCAYYPV2YYWLHVATVX55","bundle":"https://pith.science/pith/DAZY5URCAYYPV2YYWLHVATVX55/bundle.json","state":"https://pith.science/pith/DAZY5URCAYYPV2YYWLHVATVX55/state.json","well_known_bundle":"https://pith.science/.well-known/pith/DAZY5URCAYYPV2YYWLHVATVX55/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2013:DAZY5URCAYYPV2YYWLHVATVX55","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":"ca1b33bf11384e3c11a0e317311ed146e66a012db7a5e72d763533b1eb811851","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2013-02-21T09:58:16Z","title_canon_sha256":"a9b31534484be8c7fea315d130fbf51f7101387e3561c60eb2ddd6afd77abec8"},"schema_version":"1.0","source":{"id":"1302.5232","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1302.5232","created_at":"2026-05-18T01:51:34Z"},{"alias_kind":"arxiv_version","alias_value":"1302.5232v1","created_at":"2026-05-18T01:51:34Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1302.5232","created_at":"2026-05-18T01:51:34Z"},{"alias_kind":"pith_short_12","alias_value":"DAZY5URCAYYP","created_at":"2026-05-18T12:27:40Z"},{"alias_kind":"pith_short_16","alias_value":"DAZY5URCAYYPV2YY","created_at":"2026-05-18T12:27:40Z"},{"alias_kind":"pith_short_8","alias_value":"DAZY5URC","created_at":"2026-05-18T12:27:40Z"}],"graph_snapshots":[{"event_id":"sha256:f09a0494321defa8c95d5ee13002125983702e0c03ba42d568ea5ca85d42e2a9","target":"graph","created_at":"2026-05-18T01:51:34Z","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":"An isolated spin system that is in internal thermodynamic equilibrium and that has an upper limit to its allowed energy states can possess a negative temperature. We calculate the thermodynamic characteristics and the concurrence in this system over the entire range of positive and negative temperatures. Our calculation was performed for different real structures, which can be used in experiments. It is found that the temperature dependence of the concurrence is substantially asymmetrical similarly other thermodynamic characteristics. At a negative temperature the maximum concurrence and the a","authors_text":"G.B. Furman, V.L. Sokolovsky, V. M. Meerovich","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2013-02-21T09:58:16Z","title":"Quantum entanglement at negative temperature"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1302.5232","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":"sha256:552763961e0afe357e65457b5c4081f5ac6120322b15e65145baa0462d16997a","target":"record","created_at":"2026-05-18T01:51:34Z","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":"ca1b33bf11384e3c11a0e317311ed146e66a012db7a5e72d763533b1eb811851","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2013-02-21T09:58:16Z","title_canon_sha256":"a9b31534484be8c7fea315d130fbf51f7101387e3561c60eb2ddd6afd77abec8"},"schema_version":"1.0","source":{"id":"1302.5232","kind":"arxiv","version":1}},"canonical_sha256":"18338ed2220630faeb18b2cf504eb7ef6f3c251d995702f0dff030ecba4e3cff","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"18338ed2220630faeb18b2cf504eb7ef6f3c251d995702f0dff030ecba4e3cff","first_computed_at":"2026-05-18T01:51:34.570921Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:51:34.570921Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"nEGaZf1zruDKi3/NFO9JwidSAQ5pcUGH+DMipNx6HaZEEoZ6UruDXupxTN7Y6dSSKWEws2EeaLP2vRscYZKiAA==","signature_status":"signed_v1","signed_at":"2026-05-18T01:51:34.571413Z","signed_message":"canonical_sha256_bytes"},"source_id":"1302.5232","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:552763961e0afe357e65457b5c4081f5ac6120322b15e65145baa0462d16997a","sha256:f09a0494321defa8c95d5ee13002125983702e0c03ba42d568ea5ca85d42e2a9"],"state_sha256":"b055c72e55c9798dd9d200de3d56379508e62a3c6c59c79ce864f6c9c4125232"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"8aoCVYaIwPegk84VsvTZlYTLPfOWFaxMPHzzvCA1K+eFV1etADuqjGvbpjA3gPfTmy0itacYkEEFEBR4Ll9xAA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-04T10:01:54.625877Z","bundle_sha256":"c61cbcfe12de695fcc478a6f7f57ccbfc2a6911dee44a1e3330f80f336746c06"}}