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Physical review. D. Particles, fields, gravitation, and cosmology/Physical review. D. Particles and fields

Lie-Bäcklund transformations for the Madelung quantum fluid

A. J. Purcell

Published Nov 15, 1984• 3 citations
Publisher

Abstract

The Madelung quantum fluid is shown to possess an infinite sequence of Lie-B"acklund transformations; in addition, the effect of the lowest-order transformation on an exact solution of the fluid equations is explicitly calculated.
DOI
10.1103/physrevd.30.2128

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•Nov 15, 2021•0 citations
Some quantum fluid models are written as the Lagrangian flow of mass distributionsand their geometric properties are explored. The first model includes magnetic effectsand leads, via the Madelung transform,to the electromagnetic Schrödinger equation in the Madelung representation.It is shown that the Madelung transform is a symplectic map between Hamiltoniansystems. The second model is obtained from the Euler-Lagrange equations withfriction induced from a quadratic dissipative potential. This model corresponds to thequantum Navier-Stokes equations with density-dependent viscosity. The fact thatthis model possesses two different energy-dissipation identities is explainedby the definition of the Noether currents.
Quantum Fluids follow Quantum Dynamical Equation(s), which were not known till date. There exist a set of two equations that is semi classical approach to Quantum Fluids called Madelung’s Equations. But a new fully quantum variant of Madelung’s Equations when embedded in the Schrodinger Equation is gives full description of evolution of Quantum fluid with respect to time and position. The equation presented in this article has two unknown variables, one is density and other is velocity field as a function of spatial and time coordinates. The equation presented in this article, is derived from Schrodinger Equation, obeying Continuity equation, and Navier Strokes Equation. Bohm’s potential was externally added in Madeline’s equation. But the new equation which is fully quantum mechanical in nature; Bohm’s potential appears out of the equation, which is interesting to observe. Astrophysical cold stellar dynamics and condensed fluids have the main application of this equation. Quantum fluids show strange behaviour when compared to normal fluids. It is also shown that quantum fluid also has spins which has no classical analog.
Abstract Quantum Fluids follow Quantum Dynamical Equation(s), which were not known till date. There exist a set of two equations, that is semiclassical approach to Quantum Fluids called Madelung’s Equations. But a new fully quantum variant of Madelung’s Equations when embedded in the Schrodinger Equation is gives full description of evolution of Quantum fluid with respect to time and position. The equation presented in this article has two unknown variables, one is density and other is velocity field as a function of spatial and time coordinates. The equation presented in this article, is derived from Schrodinger Equation, obeying Continuity equation, and Navier Strokes Equation. Bohm’s potential were externally added in Madeline’s equation. But the new equation which is fully quantum mechanical in nature; Bohm’s potential appears out of the equation, which is interesting to observe. Astrophysical cold stellar dynamics and condensed fluids have the main application of this equation. Quantum fluids show strange behaviour when compared to normal fluids. It is also shown that quantum fluid also have spins which has no classical analog.