I am having questions when considering the microscopic models of superfluid BEC. In weakly interacting dilute alkali gas BECs, there are ways to introduce normal fluids without reducing the condensate fraction. I was wondering if any shear/bulk viscosity is going to emerge in these circumstances? E.g. if a rotating bucket experiment would be appropriate to measure the superfluidity?

  • $\begingroup$ Absence of shear viscosity is usually considered the sine qua non of superfluidity. $\endgroup$
    – Buzz
    Commented Apr 13, 2022 at 1:53


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