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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 $"},"verification_status":{"content_addressed":true,"pith_receipt":true,"author_attested":false,"weak_author_claims":0,"strong_author_claims":0,"externally_anchored":false,"storage_verified":false,"citation_signatures":0,"replication_records":0,"graph_snapshot":true,"references_resolved":false,"formal_links_present":false},"canonical_record":{"source":{"id":"1206.0059","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.quant-gas","submitted_at":"2012-06-01T01:24:48Z","cross_cats_sorted":["nucl-th"],"title_canon_sha256":"23124e0446a7e1369a9049c8d3e572cb69a85ef1a48e38a49b7d72aebb556200","abstract_canon_sha256":"eed0aec8c7a6f28da89312060b13ac7b4ff847aaea2dcb75ec1a1ebfb3f5c4e0"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T03:54:27.184382Z","signature_b64":"NypHAtAomDYyUKvk+22dt2LJVfhFRYfNBG/6VlK69Q5WhVq3lJIqUbnkk3BWF9be6VdVHGiazm0whgILpHhpBw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"0d5ac9a5b8ca804d6bed51011ab221c53587a72db4a009f156a454df4a6e2310","last_reissued_at":"2026-05-18T03:54:27.183765Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T03:54:27.183765Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"$\\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 $\\varepsilon$. 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