Physical Vacuum is a Special Superfluid Medium

The Navier-Stokes equation contains two terms which have been subjected to slight modification: (a) the viscosity term depends of time (the viscosity in average on time is zero, but its variance is non-zero), (b) the pressure gradient contains an added term describing the quantum entropy gradient multiplied by the pressure. Owing to these modifications, the Navier-Stokes equation can be reduced to the Schr\"odinger equation describing behavior of a particle into the vacuum being as a superfluid medium. Vortex structures arising in this medium show infinitely long life owing to zeroth average viscosity. The non-zero variance describes exchange of the vortex energy with zero-point energy of the vacuum. Radius of the vortex trembles around some average value. This observation sheds the light to the Zitterbewegung phenomenon. The long-lived vortex has a non-zero core where the vortex velocity vanishes.Comment: 19 pages, 12 figures. Corrected Eq. (36), "Selected Topics in Applications of Quantum Mechanics", book edited by Mohammad Reza Pahlavani, ISBN 978-953-51-2126-8, Published: May 13, 2015 under CC BY 3.0 licens