{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2019:YTJ5Z3P7PKBQJDITJCAGZVYDHI","short_pith_number":"pith:YTJ5Z3P7","canonical_record":{"source":{"id":"1905.05133","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.quant-gas","submitted_at":"2019-05-13T16:41:17Z","cross_cats_sorted":["nucl-th"],"title_canon_sha256":"9731e8689c5d9be057a15a7ff862618aa91fbcd37095afde02936b5382985760","abstract_canon_sha256":"d8240bff437db41759c15fd7b4276a9e1a57c7299ed0c41c4e2f76bfe45c532e"},"schema_version":"1.0"},"canonical_sha256":"c4d3dcedff7a83048d1348806cd7033a3a0aaf85c20b9a68e8acbae8c8673d5c","source":{"kind":"arxiv","id":"1905.05133","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1905.05133","created_at":"2026-07-05T00:34:39Z"},{"alias_kind":"arxiv_version","alias_value":"1905.05133v2","created_at":"2026-07-05T00:34:39Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1905.05133","created_at":"2026-07-05T00:34:39Z"},{"alias_kind":"pith_short_12","alias_value":"YTJ5Z3P7PKBQ","created_at":"2026-07-05T00:34:39Z"},{"alias_kind":"pith_short_16","alias_value":"YTJ5Z3P7PKBQJDIT","created_at":"2026-07-05T00:34:39Z"},{"alias_kind":"pith_short_8","alias_value":"YTJ5Z3P7","created_at":"2026-07-05T00:34:39Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2019:YTJ5Z3P7PKBQJDITJCAGZVYDHI","target":"record","payload":{"canonical_record":{"source":{"id":"1905.05133","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.quant-gas","submitted_at":"2019-05-13T16:41:17Z","cross_cats_sorted":["nucl-th"],"title_canon_sha256":"9731e8689c5d9be057a15a7ff862618aa91fbcd37095afde02936b5382985760","abstract_canon_sha256":"d8240bff437db41759c15fd7b4276a9e1a57c7299ed0c41c4e2f76bfe45c532e"},"schema_version":"1.0"},"canonical_sha256":"c4d3dcedff7a83048d1348806cd7033a3a0aaf85c20b9a68e8acbae8c8673d5c","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T00:34:39.587581Z","signature_b64":"NaIodE88egqGfmCi4WWG6s32df7mb5vbcMCi08jufdz0XuQUiGRBBtcxnv34nNRd0iEWkbhLi4eLn1vT+KOMBw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"c4d3dcedff7a83048d1348806cd7033a3a0aaf85c20b9a68e8acbae8c8673d5c","last_reissued_at":"2026-07-05T00:34:39.587162Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T00:34:39.587162Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1905.05133","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":"2026-07-05T00:34:39Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"FEW2vU1xf6FCwt/WrDNOd5SawteAd7ZbzqqXcOY6FgMidrscP7+g2jvEyw4w/mTo33K+mT6x8fkcmQ/qKHKECA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-16T03:43:10.345934Z"},"content_sha256":"cbc86c11c358c1640ec0f22099ad45a932de814b2e95b7c6b75faa59c3c4380c","schema_version":"1.0","event_id":"sha256:cbc86c11c358c1640ec0f22099ad45a932de814b2e95b7c6b75faa59c3c4380c"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2019:YTJ5Z3P7PKBQJDITJCAGZVYDHI","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"High-temperature expansion of the viscosity in interacting quantum gases","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["nucl-th"],"primary_cat":"cond-mat.quant-gas","authors_text":"Johannes Hofmann","submitted_at":"2019-05-13T16:41:17Z","abstract_excerpt":"We compute the frequency-dependent shear and bulk viscosity spectral functions of an interacting Fermi gas in a quantum virial expansion up to second quadratic order in the fugacity parameter $z=e^{\\beta \\mu}$, which is small at high temperatures. Calculations are carried out using a diagrammatic finite-temperature field-theoretic framework, in which the analytic continuation from Matsubara to real frequencies is carried out in closed analytic form. Besides a possible zero-frequency Drude peak, our results for the spectral functions show a broad continuous spectrum at all frequencies with an a"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1905.05133","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/1905.05133/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":"2026-07-05T00:34:39Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"rtJLwoFM7pzi/3Aal4f060Sukddvt9qGi20HV8VC/hFrz+TF6W6r2qA0Kb2Us7PzuBZ5rTKrHDVvA5bs7KQqDw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-16T03:43:10.346464Z"},"content_sha256":"440b2e1629b90a86e3ff452890c64ab4c09f27d06cbeaa639c706ce4d588f116","schema_version":"1.0","event_id":"sha256:440b2e1629b90a86e3ff452890c64ab4c09f27d06cbeaa639c706ce4d588f116"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/YTJ5Z3P7PKBQJDITJCAGZVYDHI/bundle.json","state_url":"https://pith.science/pith/YTJ5Z3P7PKBQJDITJCAGZVYDHI/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/YTJ5Z3P7PKBQJDITJCAGZVYDHI/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":"2026-08-16T03:43:10Z","links":{"resolver":"https://pith.science/pith/YTJ5Z3P7PKBQJDITJCAGZVYDHI","bundle":"https://pith.science/pith/YTJ5Z3P7PKBQJDITJCAGZVYDHI/bundle.json","state":"https://pith.science/pith/YTJ5Z3P7PKBQJDITJCAGZVYDHI/state.json","well_known_bundle":"https://pith.science/.well-known/pith/YTJ5Z3P7PKBQJDITJCAGZVYDHI/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2019:YTJ5Z3P7PKBQJDITJCAGZVYDHI","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":"d8240bff437db41759c15fd7b4276a9e1a57c7299ed0c41c4e2f76bfe45c532e","cross_cats_sorted":["nucl-th"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.quant-gas","submitted_at":"2019-05-13T16:41:17Z","title_canon_sha256":"9731e8689c5d9be057a15a7ff862618aa91fbcd37095afde02936b5382985760"},"schema_version":"1.0","source":{"id":"1905.05133","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1905.05133","created_at":"2026-07-05T00:34:39Z"},{"alias_kind":"arxiv_version","alias_value":"1905.05133v2","created_at":"2026-07-05T00:34:39Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1905.05133","created_at":"2026-07-05T00:34:39Z"},{"alias_kind":"pith_short_12","alias_value":"YTJ5Z3P7PKBQ","created_at":"2026-07-05T00:34:39Z"},{"alias_kind":"pith_short_16","alias_value":"YTJ5Z3P7PKBQJDIT","created_at":"2026-07-05T00:34:39Z"},{"alias_kind":"pith_short_8","alias_value":"YTJ5Z3P7","created_at":"2026-07-05T00:34:39Z"}],"graph_snapshots":[{"event_id":"sha256:440b2e1629b90a86e3ff452890c64ab4c09f27d06cbeaa639c706ce4d588f116","target":"graph","created_at":"2026-07-05T00:34:39Z","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/1905.05133/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"We compute the frequency-dependent shear and bulk viscosity spectral functions of an interacting Fermi gas in a quantum virial expansion up to second quadratic order in the fugacity parameter $z=e^{\\beta \\mu}$, which is small at high temperatures. Calculations are carried out using a diagrammatic finite-temperature field-theoretic framework, in which the analytic continuation from Matsubara to real frequencies is carried out in closed analytic form. Besides a possible zero-frequency Drude peak, our results for the spectral functions show a broad continuous spectrum at all frequencies with an a","authors_text":"Johannes Hofmann","cross_cats":["nucl-th"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.quant-gas","submitted_at":"2019-05-13T16:41:17Z","title":"High-temperature expansion of the viscosity in interacting quantum gases"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1905.05133","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:cbc86c11c358c1640ec0f22099ad45a932de814b2e95b7c6b75faa59c3c4380c","target":"record","created_at":"2026-07-05T00:34:39Z","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":"d8240bff437db41759c15fd7b4276a9e1a57c7299ed0c41c4e2f76bfe45c532e","cross_cats_sorted":["nucl-th"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.quant-gas","submitted_at":"2019-05-13T16:41:17Z","title_canon_sha256":"9731e8689c5d9be057a15a7ff862618aa91fbcd37095afde02936b5382985760"},"schema_version":"1.0","source":{"id":"1905.05133","kind":"arxiv","version":2}},"canonical_sha256":"c4d3dcedff7a83048d1348806cd7033a3a0aaf85c20b9a68e8acbae8c8673d5c","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"c4d3dcedff7a83048d1348806cd7033a3a0aaf85c20b9a68e8acbae8c8673d5c","first_computed_at":"2026-07-05T00:34:39.587162Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T00:34:39.587162Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"NaIodE88egqGfmCi4WWG6s32df7mb5vbcMCi08jufdz0XuQUiGRBBtcxnv34nNRd0iEWkbhLi4eLn1vT+KOMBw==","signature_status":"signed_v1","signed_at":"2026-07-05T00:34:39.587581Z","signed_message":"canonical_sha256_bytes"},"source_id":"1905.05133","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:cbc86c11c358c1640ec0f22099ad45a932de814b2e95b7c6b75faa59c3c4380c","sha256:440b2e1629b90a86e3ff452890c64ab4c09f27d06cbeaa639c706ce4d588f116"],"state_sha256":"ee81a780055117b93f22c035af4d9431dc9d2d2aca6d94497dbfd486846b67b9"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"LT22Tu3UpbkdWYID3+0seVcx77Yn6/xOkIW/mKGu4QH33jbCM8YdVlFIoB+7RgKYE57Gh007aiy+fSOyJHQCDA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-16T03:43:10.350134Z","bundle_sha256":"f959fcdda5ab9dc7f2a99625880294e2cbbdbb2c8bb2efdc8e834d34e114695e"}}