The reformed hydrodynamic Schrödinger equation and the effective method for eliminating pseudo-quantum potential: a case study on barotropic potential flow
Given the discrepancies between the framework of the hydrodynamic Schrödinger equation (HSE) and classical fluid dynamics, we propose a reformed framework, termed the reformed hydrodynamic Schrödinger equation (RHSE) for clarity. The RHSE for barotropic potential flow is developed; notably, we demonstrate an alternative approach to eliminate the pseudo-quantum potential without resorting to the classical limit. We call this approach the ''correction method.'' We then examine the correction method using Noether's theorem, confirming that it enforces the conservation of energy and momentum. Furthermore, we find that the classical limit fails to completely remove redundant terms when a two-component wave function is used to introduce vorticity. This fact suggests that the classical limit is not a universal fallback, highlighting the importance of further investigating the correction method.
Given the discrepancies between the framework of the hydrodynamic Schrödinger equation (HSE) and classical fluid dynamics, we propose a reformed framework, termed the reformed hydrodynamic Schrödinger equation (RHSE) for clarity. The RHSE for barotropic potential flow is developed; notably, we demonstrate an alternative approach to eliminate the pseudo-quantum potential without resorting to the classical limit. We call this approach the ''correction method.'' We then examine the correction method using Noether's theorem, confirming that it enforces the conservation of energy and momentum. Furthermore, we find that the classical limit fails to completely remove redundant terms when a two-component wave function is used to introduce vorticity. This fact suggests that the classical limit is not a universal fallback, highlighting the importance of further investigating the correction method.
The artificial fluid model known as "Schrödinger flow" (SF) can represent rotational flow with dissipative effects, and has attracted attention despite its gap from real-world fluid behavior. To address the structural discrepancy arising from the incomplete transition from quantum hydrodynamics to classical fluid dynamics, we propose a variant of the hydrodynamic Schrödinger equation (HSE) that better aligns with classical formulations. We then revisit an alternative method for eliminating the quantum potential (referred to in this work as the "cancellation approach") in light of the known non-universality of the classical limit. Beyond examining conservation laws via Lagrangian field theory, we identify its deeper connection to a generalized Lagrangian field theory, which offers a more straightforward route to constructing a Lagrangian density in terms of the components of a two-component wave function for rotational inviscid flow. Finally, we discuss the completeness of Clebsch parameterization, concluding our evaluation of the applicability of the proposed SF-variant formulation.
Simulating fluid dynamics on a quantum computer is intrinsically difficult due to the nonlinear and non-Hamiltonian nature of the Navier-Stokes equation (NSE). We propose a framework for quantum computing of fluid dynamics based on the hydrodynamic Schr\"odinger equation (HSE), which can be promising in simulating three-dimensional turbulent flows in various engineering applications. The HSE is derived by generalizing the Madelung transform to compressible or incompressible flows with finite vorticity and dissipation. Since the HSE is expressed as a unitary operator on a two-component wave function, it is more suitable than the NSE for quantum computing. The flow governed by the HSE can resemble a turbulent flow consisting of tangled vortex tubes with the five-thirds scaling of energy spectrum. We develop a prediction-correction quantum algorithm to solve the HSE. This algorithm is implemented for simple flows on the quantum simulator Qiskit with partial exponential speedup.
This paper develops a hydrodynamic derivation of nonrelativistic quantum mechanics within the Hydrodynamic Quantum Gravity (HQG) programme. Using the Madelung transformation, the Schrödinger equation is written in amplitude–phase form and shown to be exactly equivalent to (i) a continuity equation for a conserved density and (ii) an Euler-type momentum equation augmented by the “quantum potential” term. In this interpretation, the quantum potential is treated as an effective dispersive stress associated with structured vacuum dynamics, rather than as a purely formal mathematical artefact. The paper reviews how standard quantum features appear naturally in the hydrodynamic variables: interference and diffraction as phase-driven flow, stationary states as time-harmonic solutions, and quantisation as a consequence of single-valued phase (circulation) constraints. It also discusses how pilot-wave style dynamics can be expressed in this language, and surveys laboratory analogues (including walking-droplet experiments) as phenomenological motivation and intuition-building, without claiming identity between the analogue systems and the quantum vacuum. Interpretation note: “Superfluid/condensate” language is used here as an effective mathematical/analogue description of vacuum behaviour; the paper does not assert a material substrate or an operationally accessible preferred rest frame. This paper is part of a series. Companion preprints develop the gravitational and electromagnetic components of the HQG framework and discuss additional open problems and testable predictions. Discussion and feedback: https://github.com/Gptham123456/Hydrodynamic-Quantum-Gravity/discussions
I present a unified theoretical and numerical framework that couples quantum wave dynamics (Schrödinger) with classical viscous flow (Navier–Stokes) through an emergent quantum-π field (π_q) that encodes phase-topology and coherence. The model reproduces Schrödinger dynamics in the conservative limit, Navier–Stokes turbulence in the dissipative limit, and novel intermediate regimes where quantum coherence and fluid turbulence coexist and interact. I derive the governing equations by (i) applying a Madelung decomposition to a complex field ψ, (ii) introducing a controlled viscous regularization and non-linear coupling terms, and (iii) coupling a dynamically evolving π_q scalar (or tensor) field that modulates local coherence, effective mass, and information flux. I then present a robust hybrid numerical method (QHFVM — Quantum Hydrodynamic Finite-Volume Method) combining split-step spectral propagation for dispersive quantum terms and conservative finite-volume solvers for advective, viscous and pressure dynamics. I validate the approach on a set of canonical problems (quantum vortex shedding in a viscous background, π-phase revival in confined geometries, and turbulence spectra with quantum corrections), show numerical convergence and conservation properties, and outline applications spanning quantum fluids, nanoscale bio-fluids, materials, and hybrid QEC architectures. Flash explanations highlight intuition and immediate experimental tests.
We demonstrate that the Schrödinger equation is not a fundamental axiom of quantum mechanics but rather the linearized Navier-Stokes equation for torsion flow in a 23-channel structured vacuum. Schrödinger, like a brilliant plumber, discovered the correct equations for how "something" flows through the vacuum's pipes—but without knowing what that something was. Born and Bohr later convinced the world that nothing actually flows, and that ψ represents only "probability amplitude"—thus creating an artificial mystery and abandoning physical reality. We restore the water to the pipes: ψ is the local torsion of the pre-geometric tensor field Ξ_μν, |ψ|² is energy density, e^(iθ) is the helical rotation angle in channel 23, and the "probability current" j is actual hydrodynamic flow. All quantum "mysteries" (wave function collapse, superposition, tunneling, entanglement, uncertainty) emerge naturally from vacuum hydrodynamics without additional postulates. Quantum mechanics is not probabilistic—it is geometric fluid dynamics in disguise. We derive the Schrödinger equation from first principles, reinterpret all standard quantum phenomena as fluid behavior, and provide testable predictions distinguishing this framework from Copenhagen orthodoxy. Key results: (1) ψ = vacuum torsion field (physical, not probabilistic), (2) Schrödinger equation derived from Navier-Stokes, (3) quantum potential = pressure gradient, (4) momentum operator = helical screw geometry, (5) collapse = vortex stabilization at speed c, (6) entanglement = shared channel topology, (7) testable predictions: crystalline anisotropy (4% effect), vacuum viscosity (decoherence limit), propagation delays in entanglement. This work completes the demolition of Copenhagen interpretation and restores physical realism to quantum mechanics. The brilliant plumber (Schrödinger) gave us the pipes. We give you the blueprint.
This research aims to formulate conserved quantities (classical observables) in Noether’s theorem for quantum hydrodynamics within the framework of symplectic geometry. The symplectic one-form or symplectic potential is identical to the Noether current. 31 The Noether current plays an important role in determining classical observables and conserved quantities, namely, [Formula: see text] and [Formula: see text] associated with the above symmetry in quantum hydrodynamics (nonrelativistic and relativistic) associated with Killing vector field and rotational symmetry group [Formula: see text].