{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2014:URUUNWMS7NRWNG6LF5PAMCROV7","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":"5b07792d85e7375b2c0db31ce89467930ff1f6853a3c888a233ab61f99e6979b","cross_cats_sorted":["cond-mat.quant-gas"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mes-hall","submitted_at":"2014-10-01T14:22:04Z","title_canon_sha256":"5c2f871decd0fc1558c794864b8dd448d5f689b7f9649fbd4464301839bbc983"},"schema_version":"1.0","source":{"id":"1410.0238","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1410.0238","created_at":"2026-05-18T01:09:37Z"},{"alias_kind":"arxiv_version","alias_value":"1410.0238v1","created_at":"2026-05-18T01:09:37Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1410.0238","created_at":"2026-05-18T01:09:37Z"},{"alias_kind":"pith_short_12","alias_value":"URUUNWMS7NRW","created_at":"2026-05-18T12:28:52Z"},{"alias_kind":"pith_short_16","alias_value":"URUUNWMS7NRWNG6L","created_at":"2026-05-18T12:28:52Z"},{"alias_kind":"pith_short_8","alias_value":"URUUNWMS","created_at":"2026-05-18T12:28:52Z"}],"graph_snapshots":[{"event_id":"sha256:2ef70271779bf3c91952c6606a7858095973347c6c611bf08a31af767b75d7f7","target":"graph","created_at":"2026-05-18T01:09:37Z","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":"We report an experimental study of superfluid hydrodynamic effects in a one-dimensional polariton fluid flowing along a laterally patterned semiconductor microcavity and hitting a micron-sized engineered defect. At high excitation power, superfluid propagation effects are observed in the polariton dynamics, in particular, a sharp acoustic horizon is formed at the defect position, separating regions of sub- and super-sonic flow. Our experimental findings are quantitatively reproduced by theoretical calculations based on a generalized Gross-Pitaevskii equation. Promising perspectives to observe ","authors_text":"A. Amo, A. Lema\\^itre, D. Gerace, D. Sanvitto, E. Galopin, H. S. Nguyen, I. Carusotto, I. Sagnes, J. Bloch","cross_cats":["cond-mat.quant-gas"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mes-hall","submitted_at":"2014-10-01T14:22:04Z","title":"An acoustic black hole in a stationary hydrodynamic flow of microcavity polaritons"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1410.0238","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":"sha256:4a2825e54283738ad2d51d6cf67fc873d7983c7b96e15493d9c6badf60a8eb8e","target":"record","created_at":"2026-05-18T01:09:37Z","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":"5b07792d85e7375b2c0db31ce89467930ff1f6853a3c888a233ab61f99e6979b","cross_cats_sorted":["cond-mat.quant-gas"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mes-hall","submitted_at":"2014-10-01T14:22:04Z","title_canon_sha256":"5c2f871decd0fc1558c794864b8dd448d5f689b7f9649fbd4464301839bbc983"},"schema_version":"1.0","source":{"id":"1410.0238","kind":"arxiv","version":1}},"canonical_sha256":"a46946d992fb63669bcb2f5e060a2eaff68a3b939bee7dc17b14f17829987428","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"a46946d992fb63669bcb2f5e060a2eaff68a3b939bee7dc17b14f17829987428","first_computed_at":"2026-05-18T01:09:37.403118Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:09:37.403118Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"XHCSY8dQAphpxMcyoLhnEzheSWmH6AuEkYrc7GmGV0NDwAep5Pdu0oQ+oHqn+vURLcCyoUFTsLwPuAyj0Va1Dg==","signature_status":"signed_v1","signed_at":"2026-05-18T01:09:37.403512Z","signed_message":"canonical_sha256_bytes"},"source_id":"1410.0238","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:4a2825e54283738ad2d51d6cf67fc873d7983c7b96e15493d9c6badf60a8eb8e","sha256:2ef70271779bf3c91952c6606a7858095973347c6c611bf08a31af767b75d7f7"],"state_sha256":"84e55652393f20ceab544a60c0521cfa6678c1dbffd7eede2afe4771d5bfca10"}