{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2009:4ECDM74RNSRZA3SE6E3UFBAAMA","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":"7a8139334ba41b9839253801199e5588ae3a931aa892bbd84487930ec68896dd","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"hep-th","submitted_at":"2009-06-26T16:32:16Z","title_canon_sha256":"e240a905f8a0c9c2430f829aef2c4f2c4770265b0322a56031cd0a8a72e60148"},"schema_version":"1.0","source":{"id":"0906.4810","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"0906.4810","created_at":"2026-05-18T03:23:59Z"},{"alias_kind":"arxiv_version","alias_value":"0906.4810v1","created_at":"2026-05-18T03:23:59Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.0906.4810","created_at":"2026-05-18T03:23:59Z"},{"alias_kind":"pith_short_12","alias_value":"4ECDM74RNSRZ","created_at":"2026-05-18T12:25:58Z"},{"alias_kind":"pith_short_16","alias_value":"4ECDM74RNSRZA3SE","created_at":"2026-05-18T12:25:58Z"},{"alias_kind":"pith_short_8","alias_value":"4ECDM74R","created_at":"2026-05-18T12:25:58Z"}],"graph_snapshots":[{"event_id":"sha256:c7d84c11dd220497d36a1b3834c875f7de382b14fd385c9214b20de5d56c18bd","target":"graph","created_at":"2026-05-18T03:23:59Z","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":"Superfluids support many different types of sound waves. We investigate the relation between the sound waves in a relativistic and a non-relativistic superfluid by using hydrodynamics to calculate the various sound speeds. Then, using a particular holographic scalar gravity realization of a strongly interacting superfluid, we compute first, second and fourth sound speeds as a function of the temperature. The relativistic low temperature results for second sound differ from Landau's well known prediction for the non-relativistic, incompressible case.","authors_text":"Amos Yarom, Christopher P. Herzog","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"hep-th","submitted_at":"2009-06-26T16:32:16Z","title":"Sound modes in holographic superfluids"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0906.4810","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":"sha256:9990d5ee01237862c2e3c5c503cb5884b2f00fb78f9d2ea97c704af9b5914945","target":"record","created_at":"2026-05-18T03:23:59Z","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":"7a8139334ba41b9839253801199e5588ae3a931aa892bbd84487930ec68896dd","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"hep-th","submitted_at":"2009-06-26T16:32:16Z","title_canon_sha256":"e240a905f8a0c9c2430f829aef2c4f2c4770265b0322a56031cd0a8a72e60148"},"schema_version":"1.0","source":{"id":"0906.4810","kind":"arxiv","version":1}},"canonical_sha256":"e104367f916ca3906e44f137428400603ac4be3ace53c3106dd635bfccbe0062","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"e104367f916ca3906e44f137428400603ac4be3ace53c3106dd635bfccbe0062","first_computed_at":"2026-05-18T03:23:59.199440Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T03:23:59.199440Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"87ZQnAEtIYuyw4qOZ2s3F2lxvFdaurtSZPmi7cw8Y/jQVjIxeJCNq+CU/Vidt01pY8KrMa9NhCCWRgWzFCzMBw==","signature_status":"signed_v1","signed_at":"2026-05-18T03:23:59.200171Z","signed_message":"canonical_sha256_bytes"},"source_id":"0906.4810","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:9990d5ee01237862c2e3c5c503cb5884b2f00fb78f9d2ea97c704af9b5914945","sha256:c7d84c11dd220497d36a1b3834c875f7de382b14fd385c9214b20de5d56c18bd"],"state_sha256":"337d6ee56ee95b1b4779de32a8f78bbc2330228c556d0c25d8aa48acc304cd4f"}