Vortex Shedding from a Microsphere Oscillating in Superfluid 4He at mK Temperatures and from a Laser Beam Moving in a Bose–Einstein Condensate

Turbulent drag of an oscillating microsphere that is levitating in superfluid 4 He at mK temperatures, is unstable slightly above a critical velocity amplitude v c . The lifetime τ of the turbulent state is determined by the number n of vortices shed per half-period. It is found that this number is...

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