{"schema":"pubphys.bundle/1","record":{"author":{"account_ref":null,"orcid":null},"builds_on":[],"content_schema":"pubphys.content.revision/1","content_sha256":"f2ce6f84c0a0deff6f25fe1dffefac77182f687dbd27fa3a8e1c09756362a207","created":"2026-10-03T07:17:54Z","files":[],"origin":{"assisted_by":[],"kind":"seed"},"parents":["5475cf5dc5b1a72283d26dc95dc6e00d7ea4e00096a7c6492e409a1816eeb011"],"salt":"53e8a0a689ddad995a969daedeabcb413c217205adfcc9a769e1a927bcf41bf8","schema":"pubphys.record/2","site":"pubphys.com","target":null,"type":"revision"},"content":{"answer_type":"value","assisted_by":[],"external_id":"amo.unitary-fermi-transport.pseudogap-at-unitarity","kind":"well-posed","literature_status":"contested","n":"1","parents":[],"plain":"Atoms may form short-lived pairs above the temperature where they become superfluid, opening a partial energy gap. Experiments disagree on whether this gap exists.","posed_since":"","precise":"Homogeneous unitary gas for $T_{c} < T < 1.5 T_{c}$. Measure the single-particle spectral function $A(k, \\omega)$ and determine whether spectral weight at $k = k_{F}$ and $\\omega = 0$ is suppressed, the gap scale $\\Delta_{\\mathrm{pg}}$, and the temperature $T*$ where it closes. Answer: $T*/T_{c}$ and $\\Delta_{\\mathrm{pg}}/E_{F}$ with errors, or an upper bound excluding a gap.","problem_ref":null,"references":"","settled_by":"Momentum-resolved spectroscopy of a uniform gas with final-state effects removed, reproduced by two independent groups.","status_note":"A 2024 microwave-spectroscopy experiment reported a pseudogap (Li et al., Nature 626, 288), while earlier rf studies of uniform gases were interpreted without one.","title":"Is there a pairing pseudogap above $T_{\\mathrm{c}}$ in the unitary 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