{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2018:DC6QT454N7AZUQF4RZERNW4VI3","short_pith_number":"pith:DC6QT454","canonical_record":{"source":{"id":"1809.01099","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mes-hall","submitted_at":"2018-09-04T17:04:29Z","cross_cats_sorted":["cond-mat.quant-gas","cond-mat.str-el"],"title_canon_sha256":"64947dcf8eac5e2cd093eaba1018b27acc979a47fed7408a42751ab38d6c66f4","abstract_canon_sha256":"92e8d5d962dde1f2f08dfe2f851f701b8f93a83e6dfdb4cbfd70e5cddf5d7043"},"schema_version":"1.0"},"canonical_sha256":"18bd09f3bc6fc19a40bc8e4916db9546d55123e3a1fd1fa22afcc4960dc8c9b2","source":{"kind":"arxiv","id":"1809.01099","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1809.01099","created_at":"2026-05-18T00:01:28Z"},{"alias_kind":"arxiv_version","alias_value":"1809.01099v1","created_at":"2026-05-18T00:01:28Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1809.01099","created_at":"2026-05-18T00:01:28Z"},{"alias_kind":"pith_short_12","alias_value":"DC6QT454N7AZ","created_at":"2026-05-18T12:32:19Z"},{"alias_kind":"pith_short_16","alias_value":"DC6QT454N7AZUQF4","created_at":"2026-05-18T12:32:19Z"},{"alias_kind":"pith_short_8","alias_value":"DC6QT454","created_at":"2026-05-18T12:32:19Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2018:DC6QT454N7AZUQF4RZERNW4VI3","target":"record","payload":{"canonical_record":{"source":{"id":"1809.01099","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mes-hall","submitted_at":"2018-09-04T17:04:29Z","cross_cats_sorted":["cond-mat.quant-gas","cond-mat.str-el"],"title_canon_sha256":"64947dcf8eac5e2cd093eaba1018b27acc979a47fed7408a42751ab38d6c66f4","abstract_canon_sha256":"92e8d5d962dde1f2f08dfe2f851f701b8f93a83e6dfdb4cbfd70e5cddf5d7043"},"schema_version":"1.0"},"canonical_sha256":"18bd09f3bc6fc19a40bc8e4916db9546d55123e3a1fd1fa22afcc4960dc8c9b2","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T00:01:28.491897Z","signature_b64":"7c7Am2e4P8zX1Vjq+JNi0ZhztDOa1sgiJacDqzciWo97Rf96Fhazxj9ICYY2PxJ5kGQ87wjsM1Bjrd2tuix0Ag==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"18bd09f3bc6fc19a40bc8e4916db9546d55123e3a1fd1fa22afcc4960dc8c9b2","last_reissued_at":"2026-05-18T00:01:28.491303Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T00:01:28.491303Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1809.01099","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":"2026-05-18T00:01:28Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"T7P2LarXtnc63Mgj3yJuHpezEIRV/ULhK9FfYsDN1RQfKaYvCV4+6EPiE+ZhMiDFICncsauWa/y6LAcycoeYCg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-04T13:38:10.984256Z"},"content_sha256":"bf5c6600683f4d01e339f6cd6c7273cb2d1766fad08073c7e53b314ffa272f61","schema_version":"1.0","event_id":"sha256:bf5c6600683f4d01e339f6cd6c7273cb2d1766fad08073c7e53b314ffa272f61"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2018:DC6QT454N7AZUQF4RZERNW4VI3","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Propagation and attenuation of sound in one-dimensional quantum liquids","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["cond-mat.quant-gas","cond-mat.str-el"],"primary_cat":"cond-mat.mes-hall","authors_text":"A. V. Andreev, K. A. Matveev","submitted_at":"2018-09-04T17:04:29Z","abstract_excerpt":"At low temperatures, elementary excitations of a one-dimensional quantum liquid form a gas that can move as a whole with respect to the center of mass of the system. This internal motion attenuates at exponentially long time scales. As a result, in a broad range of frequencies the liquid is described by two-fluid hydrodynamics, and the system supports two sound modes. The physical nature of the two sounds depends on whether the particles forming the quantum liquid have a spin degree of freedom. For particles with spin, the modes are analogous to the first and second sound modes in superfluid $"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1809.01099","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":"2026-05-18T00:01:28Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"fGph2YvL3CDWKr289yCNOk5iFXkdKb9J2D3E2VvqHI5QZUR8OYOII2sOpmwUr+6IQHlV3Qjrp8mJiGUQT1mSCg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-04T13:38:10.984954Z"},"content_sha256":"2e51bc48dab750438c70c2fe5ed86dfd22bbf3bb4ae41ccc3251527ffea0d278","schema_version":"1.0","event_id":"sha256:2e51bc48dab750438c70c2fe5ed86dfd22bbf3bb4ae41ccc3251527ffea0d278"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/DC6QT454N7AZUQF4RZERNW4VI3/bundle.json","state_url":"https://pith.science/pith/DC6QT454N7AZUQF4RZERNW4VI3/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/DC6QT454N7AZUQF4RZERNW4VI3/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":"2026-06-04T13:38:10Z","links":{"resolver":"https://pith.science/pith/DC6QT454N7AZUQF4RZERNW4VI3","bundle":"https://pith.science/pith/DC6QT454N7AZUQF4RZERNW4VI3/bundle.json","state":"https://pith.science/pith/DC6QT454N7AZUQF4RZERNW4VI3/state.json","well_known_bundle":"https://pith.science/.well-known/pith/DC6QT454N7AZUQF4RZERNW4VI3/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2018:DC6QT454N7AZUQF4RZERNW4VI3","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":"92e8d5d962dde1f2f08dfe2f851f701b8f93a83e6dfdb4cbfd70e5cddf5d7043","cross_cats_sorted":["cond-mat.quant-gas","cond-mat.str-el"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mes-hall","submitted_at":"2018-09-04T17:04:29Z","title_canon_sha256":"64947dcf8eac5e2cd093eaba1018b27acc979a47fed7408a42751ab38d6c66f4"},"schema_version":"1.0","source":{"id":"1809.01099","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1809.01099","created_at":"2026-05-18T00:01:28Z"},{"alias_kind":"arxiv_version","alias_value":"1809.01099v1","created_at":"2026-05-18T00:01:28Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1809.01099","created_at":"2026-05-18T00:01:28Z"},{"alias_kind":"pith_short_12","alias_value":"DC6QT454N7AZ","created_at":"2026-05-18T12:32:19Z"},{"alias_kind":"pith_short_16","alias_value":"DC6QT454N7AZUQF4","created_at":"2026-05-18T12:32:19Z"},{"alias_kind":"pith_short_8","alias_value":"DC6QT454","created_at":"2026-05-18T12:32:19Z"}],"graph_snapshots":[{"event_id":"sha256:2e51bc48dab750438c70c2fe5ed86dfd22bbf3bb4ae41ccc3251527ffea0d278","target":"graph","created_at":"2026-05-18T00:01:28Z","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":"At low temperatures, elementary excitations of a one-dimensional quantum liquid form a gas that can move as a whole with respect to the center of mass of the system. This internal motion attenuates at exponentially long time scales. As a result, in a broad range of frequencies the liquid is described by two-fluid hydrodynamics, and the system supports two sound modes. The physical nature of the two sounds depends on whether the particles forming the quantum liquid have a spin degree of freedom. For particles with spin, the modes are analogous to the first and second sound modes in superfluid $","authors_text":"A. V. Andreev, K. A. Matveev","cross_cats":["cond-mat.quant-gas","cond-mat.str-el"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mes-hall","submitted_at":"2018-09-04T17:04:29Z","title":"Propagation and attenuation of sound in one-dimensional quantum liquids"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1809.01099","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:bf5c6600683f4d01e339f6cd6c7273cb2d1766fad08073c7e53b314ffa272f61","target":"record","created_at":"2026-05-18T00:01:28Z","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":"92e8d5d962dde1f2f08dfe2f851f701b8f93a83e6dfdb4cbfd70e5cddf5d7043","cross_cats_sorted":["cond-mat.quant-gas","cond-mat.str-el"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mes-hall","submitted_at":"2018-09-04T17:04:29Z","title_canon_sha256":"64947dcf8eac5e2cd093eaba1018b27acc979a47fed7408a42751ab38d6c66f4"},"schema_version":"1.0","source":{"id":"1809.01099","kind":"arxiv","version":1}},"canonical_sha256":"18bd09f3bc6fc19a40bc8e4916db9546d55123e3a1fd1fa22afcc4960dc8c9b2","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"18bd09f3bc6fc19a40bc8e4916db9546d55123e3a1fd1fa22afcc4960dc8c9b2","first_computed_at":"2026-05-18T00:01:28.491303Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:01:28.491303Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"7c7Am2e4P8zX1Vjq+JNi0ZhztDOa1sgiJacDqzciWo97Rf96Fhazxj9ICYY2PxJ5kGQ87wjsM1Bjrd2tuix0Ag==","signature_status":"signed_v1","signed_at":"2026-05-18T00:01:28.491897Z","signed_message":"canonical_sha256_bytes"},"source_id":"1809.01099","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:bf5c6600683f4d01e339f6cd6c7273cb2d1766fad08073c7e53b314ffa272f61","sha256:2e51bc48dab750438c70c2fe5ed86dfd22bbf3bb4ae41ccc3251527ffea0d278"],"state_sha256":"407a7944b64d5dcdbc99a3d99c3656795be178dd185585f0b69ec10bcab2b3f5"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"FEfmwnGUIENBEtQJiEqV8Fjtu9TJJcBO2NHOO5ReDQqkRKMk/cSMqlitZhKpQQQ0Tt/hNLESO2o1SfOfnJd7BA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-04T13:38:10.988567Z","bundle_sha256":"c265d8c4bb02d48fe77249c9ed2eff1c390c03fb157220d2dd81f2d9e33664c6"}}