{"record":{"author":{"account_ref":null,"orcid":null},"builds_on":[],"content_schema":"pubphys.content.revision/1","content_sha256":"a4d4a8de2b0e757f2a554ae1d44698a5f9c18c75a9f94837038054e98fa1a26a","created":"2026-10-03T07:18:03Z","files":[],"origin":{"assisted_by":[],"kind":"seed"},"parents":["5475cf5dc5b1a72283d26dc95dc6e00d7ea4e00096a7c6492e409a1816eeb011"],"salt":"a8dcfaf06a673c1e677c7f348f06c9cf1a911753d98b82e9b28a04eb529a6c0e","schema":"pubphys.record/2","site":"pubphys.com","target":null,"type":"revision"},"content":{"answer_type":"identification","assisted_by":[],"external_id":"fluid.quantum-turbulence.crossover-bottleneck","kind":"well-posed","literature_status":"contested","n":"1","parents":[],"plain":"In superfluid turbulence, energy moves first through swirls made of many vortex lines and then along single lines. At the handover scale energy may pile up, and theories disagree on how.","posed_since":"2007","precise":"At scales near the mean intervortex spacing $\\ell = L^{-1/2}$, energy passes from the Kolmogorov cascade carried by polarized vortex bundles to the Kelvin-wave cascade on individual lines. Determine the energy spectrum across this crossover at $T \\to 0$ (a bottleneck pile-up predicted by L'vov, Nazarenko and Rudenko, versus a reconnection-driven crossover proposed by Kozik and Svistunov) and its consequence for $\\nu'$.","problem_ref":null,"references":"","settled_by":"Vortex-filament or Gross-Pitaevskii simulations resolving at least a decade on each side of l, compared with the predicted crossover spectra.","status_note":"","title":"Energy transfer across the classical-quantum crossover scale","topic_ref":"cfe86b913c28db61b8da643149e508af2654c7237f0b6efa1efaa4c2c1fe95b1"},"attested":{"attestation":{"batch":null,"client_id":null,"id_token_sha256":null,"kind":"platform"},"record_hash":"9aab43e2c404c2be15d2051e36d78d05bd0c9f67ab43b5f0eae579ec289dd499","schema":"pubphys.attested/1"},"envelope":{"attested_hash":"9bc2e0f5d14f6a90c4bc7f4cb5e98daafce724e2d9efa9853cdc3f829dbd8cdf","platform_signature":{"key_id":"c6afc19b31429869751f06879c75cd64ea92654423d15b44be775bf1310a60da","sig":"6wG8Qs_AUhNbt_ck8fgd1qKBCBtH9Ch3nVudSEwGGkpBZnDtRkejAvzk0luvEDcFLsHXIJOE3WGmSwYK1pSIBw"},"schema":"pubphys.envelope/1"},"record_hash":"9aab43e2c404c2be15d2051e36d78d05bd0c9f67ab43b5f0eae579ec289dd499","leaf_index":1420}