{"record":{"author":{"account_ref":null,"orcid":null},"builds_on":[],"content_schema":"pubphys.content.revision/1","content_sha256":"d1df4af1f32e0ee2c774208790615f66287db00703c73f6d1f2fee1af0b64b67","created":"2026-10-03T07:17:59Z","files":[],"origin":{"assisted_by":[],"kind":"seed"},"parents":["5475cf5dc5b1a72283d26dc95dc6e00d7ea4e00096a7c6492e409a1816eeb011"],"salt":"631e345aa4cc874899e86a6a576a04585b9b4e7837d28c52ad5ab6772bb8f310","schema":"pubphys.record/2","site":"pubphys.com","target":null,"type":"revision"},"content":{"answer_type":"yes-no","assisted_by":[],"external_id":"cm.driven-dissipative.kpz-2d-condensate","kind":"well-posed","literature_status":"open","n":"1","parents":[],"plain":"A two-dimensional light-matter condensate that is constantly pumped and leaking was predicted to lose long-range coherence at very large distances, unlike an equilibrium superfluid. This prediction lacks a decisive experimental test.","posed_since":"2015","precise":"For a 2D driven-dissipative condensate described by a stochastic complex Ginzburg-Landau equation, phase dynamics maps to the compact KPZ equation, predicting algebraic order only up to a length $L*$ growing exponentially with the inverse nonequilibrium coupling (Altman, Sieberer, Chen, Diehl, Toner 2015). Is the loss of algebraic order beyond $L*$ observed in exciton-polariton condensates, and what replaces it (vortex-dominated disorder or a KPZ-roughened phase)? Answer yes or no, with the large-distance correlation form.","problem_ref":null,"references":"","settled_by":"Measurement of first-order coherence $g1(r, t)$ in a large uniform 2D polariton condensate showing the crossover from algebraic decay to KPZ or stretched-exponential scaling.","status_note":"$1\\mathrm{D}$ KPZ scaling of the condensate phase was observed in 2022 (Fontaine et al., Nature); a 2026 PRL (Misko, Starkova, Lagoudakis, doi:10.1103/z3ty-255t) reports KPZ physics in optically confined continuous condensates, and its bearing on the $2\\mathrm{D}$ question was not checked.","title":"Does KPZ physics destroy order in two-dimensional polariton condensates","topic_ref":"5dd6029e43cc7f7be6ee23b6a25d17a2dd7c22cce665f531e739c624b325e253"},"attested":{"attestation":{"batch":null,"client_id":null,"id_token_sha256":null,"kind":"platform"},"record_hash":"b64ec7c0a829f8621b07772b25c87041f3d0b2696fa31986caee08a9a4006adc","schema":"pubphys.attested/1"},"envelope":{"attested_hash":"fcc170bcb6650b7daaca52064a9248e522321a08a9b43518510bcfc9810c7d68","platform_signature":{"key_id":"c6afc19b31429869751f06879c75cd64ea92654423d15b44be775bf1310a60da","sig":"ATfHaAaaxmYIE2i4d9DpgyeNwzskt1_B46auqkY0uIlVA0wNNwBZFLxAU1gK1j6daoBX1mInr3qSoYxFtdrvBQ"},"schema":"pubphys.envelope/1"},"record_hash":"b64ec7c0a829f8621b07772b25c87041f3d0b2696fa31986caee08a9a4006adc","leaf_index":960}