{"paper":{"title":"$\\eta/s$ of the Normal Phase of Unitary Fermi Gas from $\\varepsilon$ Expansion","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["nucl-th"],"primary_cat":"cond-mat.quant-gas","authors_text":"Andrei Kryjevski","submitted_at":"2012-06-01T01:24:48Z","abstract_excerpt":"Using $\\varepsilon$-expansion technique we compute $\\eta/s$, where $\\eta$ is the shear viscosity, $s$ is the entropy density, of the normal phase of unitary Fermi gas in $d=4-\\varepsilon$ dimensions to LO in $\\varepsilon$. We use kinetic theory approach and solve transport equations for medium perturbed by a shear hydrodynamic flow. The collision integrals are calculated to $\\varepsilon^2$ which is LO. The LO result is temperature independent with $\\eta/\\rm s\\simeq (0.11/\\varepsilon^2)(\\hbar/k_B).$ The $d=3$ prediction for $\\eta/\\rm s$ exceeds the $\\hbar/4 \\pi k_B$ bound by a factor of about $"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1206.0059","kind":"arxiv","version":1},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"references":{"count":0,"sample":[],"resolved_work":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","internal_anchors":0},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"author_claims":{"count":0,"strong_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"builder_version":"pith-number-builder-2026-05-17-v1"}