{"record":{"author":{"account_ref":null,"orcid":null},"builds_on":[],"content_schema":"pubphys.content.revision/1","content_sha256":"0797765ad4b561702854767ecd88333a16161a6abff45be6a387fd99425e4100","created":"2026-10-15T23:43:22Z","files":[],"origin":{"assisted_by":["ai:gpt-5.5"],"kind":"seed"},"parents":["685f9b8c875eff20e5a6b04f0df8911c92de091ff9ce3fd61b2dec769536d0da","ce59fb6cd812fc05906d0c60a71c75ea22bc686bcf38e7c3ef7010834d98ee7b"],"salt":"86678f0ad0609edb53bfedcfa34bdbbb97023c8fb72af49a3877938c6d7217b5","schema":"pubphys.record/2","site":"pubphys.com","target":null,"type":"revision"},"content":{"answer_type":"identification","assisted_by":["ai:gpt-5.5"],"external_id":"stat.kpz-higher-d.experiment-2plus1","kind":"well-posed","literature_status":"partially-resolved","n":"2","parents":[],"plain":"One-dimensional KPZ laws have been seen in liquid-crystal turbulence and in fluids of light, while two-dimensional tests exist only for flat growing films. A clean experiment in another geometry or system would measure the full statistics of a growing two-dimensional surface or its analog, not only its exponents.","posed_since":"","precise":"Measure, in a $2+1$ dimensional KPZ system other than flat thin-film deposition (curved or stationary initial geometry, or the phase of a 2D driven-dissipative condensate), the one-point distribution of $\\chi$ and the spatial and two-time correlation functions, and compare them with simulated universal functions for that geometry (exponents $\\alpha \\text{ approximately } 0.39, z \\text{ approximately } 1.61$).","problem_ref":"685f9b8c875eff20e5a6b04f0df8911c92de091ff9ce3fd61b2dec769536d0da","references":"","settled_by":"A measurement whose distribution of $\\chi$, including skewness and kurtosis, and whose two-time correlations agree with simulations for the matching geometry within experimental error.","status_note":"Height distributions matching 2+1 KPZ simulations were measured in CdTe thin films (Almeida, Ferreira, Oliveira, Aarao Reis, Phys. Rev. B 89, 045309, 2014); a 2025 exciton-polariton experiment reported 2D KPZ scaling of phase correlations (arXiv:2506.15521); curved and stationary geometries and two-time statistics remain untested.","title":"Measuring 2+1 KPZ statistics beyond flat thin-film growth","topic_ref":null},"attested":{"attestation":{"batch":null,"client_id":null,"id_token_sha256":null,"kind":"platform"},"record_hash":"c3c88b35faa8060195570d9697e2cc204765725977853f9b32a96f09aef8a222","schema":"pubphys.attested/1"},"envelope":{"attested_hash":"83c4b49c6c1fa0492dbc3607db5b3f0c4030d2bd49eaf3390b247b213e0b2119","platform_signature":{"key_id":"c6afc19b31429869751f06879c75cd64ea92654423d15b44be775bf1310a60da","sig":"xchREfCheTyXZlvc8iVrWfZtSsIrnmyFB15O_8c77uIndJ4nyqAzmA6M_URsZimBOkiFy8F5mMBPS0h1u75FCw"},"schema":"pubphys.envelope/1"},"record_hash":"c3c88b35faa8060195570d9697e2cc204765725977853f9b32a96f09aef8a222","leaf_index":3784}