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arxiv: 2601.07932 · v1 · submitted 2026-01-12 · 🪐 quant-ph · physics.hist-ph

Bohmian mechanics: A legitimate hydrodynamic picture for quantum mechanics, and beyond

Pith reviewed 2026-05-16 14:40 UTC · model grok-4.3

classification 🪐 quant-ph physics.hist-ph
keywords Bohmian mechanicshydrodynamic pictureSchrödinger equationquantum representationspractical applicationshidden variablesnumerical methods
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The pith

Bohmian mechanics provides a legitimate hydrodynamic picture of quantum mechanics through its practical analytical uses.

A machine-rendered reading of the paper's core claim, the machinery that carries it, and where it could break.

Bohmian mechanics began as a hidden-variable approach meant to sidestep von Neumann's theorem but met strong initial resistance. Applications to concrete problems in physics since the late 1990s shifted its role toward a pragmatic tool for analysis and computation based on the Schrödinger equation. This change supports treating it as a valid quantum representation that belongs in elementary courses. The paper supports the view by re-examining the Schrödinger equation and numerical examples under a less restrictive lens than usual.

Core claim

Bohmian mechanics, once framed as a hidden-variable model, now functions as a hydrodynamic representation for quantum mechanics, where the wave function guides fluid-like trajectories; this pragmatic shift, shown through re-analysis of the Schrödinger equation and specific examples, establishes it as a legitimate quantum framework suitable for teaching and extension to other fields.

What carries the argument

The hydrodynamic picture of the Schrödinger equation, in which quantum evolution is recast as a fluid flow with trajectories determined by the wave function.

If this is right

  • Bohmian mechanics serves as an effective analytical and computational tool for problems across branches of physics.
  • It can be taught in elementary quantum mechanics courses as a standard representation.
  • The hydrodynamic approach allows transfer of ideas to benefit other fields.
  • Moderate acceptance replaces early controversy as operational value becomes clear.

Where Pith is reading between the lines

These are editorial extensions of the paper, not claims the author makes directly.

  • Trajectory-based methods may offer computational advantages in simulating certain many-particle quantum systems.
  • Similar pragmatic acceptance could apply to other alternative quantum pictures without full resolution of foundational issues.
  • Extensions to relativistic domains or open quantum systems could follow the same operational path.

Load-bearing premise

Community attitude shifts and practical examples are enough to establish legitimacy without directly resolving foundational objections such as von Neumann's theorem.

What would settle it

A specific quantum problem where Bohmian trajectory calculations produce results that systematically disagree with both standard quantum predictions and experimental measurements.

Figures

Figures reproduced from arXiv: 2601.07932 by A. S. Sanz.

Figure 1
Figure 1. Figure 1: Probability density (a) and velocity field (b) for a linear superposition of two Gaussian [PITH_FULL_IMAGE:figures/full_fig_p011_1.png] view at source ↗
Figure 2
Figure 2. Figure 2: Transverse cuts of the velocity field at various times for a two-Gaussian wave-packet super [PITH_FULL_IMAGE:figures/full_fig_p012_2.png] view at source ↗
Figure 3
Figure 3. Figure 3: This does not mean that we the phase coherence has been lost; it has only been lost for a single [PITH_FULL_IMAGE:figures/full_fig_p013_3.png] view at source ↗
Figure 4
Figure 4. Figure 4: Bohmian trajectories associated with a Bell-type bipartite continuous variable state (a)-(b), [PITH_FULL_IMAGE:figures/full_fig_p014_4.png] view at source ↗
Figure 5
Figure 5. Figure 5: Propagation of an ideal Airby beam (a) and a finite-energy Airy beam (b). The contour [PITH_FULL_IMAGE:figures/full_fig_p017_5.png] view at source ↗
Figure 6
Figure 6. Figure 6: In the central part, Bohmian trajectories associated with a superposition of two counter [PITH_FULL_IMAGE:figures/full_fig_p018_6.png] view at source ↗
read the original abstract

Since its inception, Bohmian mechanics has been surrounded by a halo of controversy. Originally proposed to bypass the limitations imposed by von Neumann's theorem on the impossibility of hidden-variable models in quantum mechanics, it faced strong opposition from the outset. Over time, however, its use in tackling specific problems across various branches of physics has led to a gradual shift in attitude, turning the early resistance into a more moderate acceptance. A plausible explanation for this change may be that, since the late 1990s and early 2000s, Bohmian mechanics has been taking on a more operational and practical role. The original hidden-variable idea has gradually faded from its framework, giving way to a more pragmatic approach that treats it as a suitable analytical and computational tool. This discussion explores how and why such a shift in perspective has occurred and, therefore, answers questions such as whether Bohmian mechanics should be considered once and for all a legitimate quantum representation (i.e., worth being taught in elementary quantum mechanics courses) or, by extension, whether these ideas can be transferred to and benefit other fields. Here, the Schr\"odinger equation and several specific numerical examples are re-examined in the light of a less restrictive view than the standard one usually adopted in quantum mechanics.

Editorial analysis

A structured set of objections, weighed in public.

Desk editor's note, referee report, simulated authors' rebuttal, and a circularity audit. Tearing a paper down is the easy half of reading it; the pith above is the substance, this is the friction.

Referee Report

3 major / 2 minor

Summary. The manuscript claims that Bohmian mechanics, originally introduced to circumvent von Neumann's theorem on the impossibility of hidden-variable models, has undergone a pragmatic shift since the late 1990s toward operational and computational use as a hydrodynamic picture. This evolution, away from strict hidden-variable interpretations, is presented as establishing it as a legitimate quantum representation suitable for elementary teaching, with the Schrödinger equation and selected numerical examples re-examined under a less restrictive viewpoint to illustrate broader applicability across physics.

Significance. If the historical and pragmatic narrative holds, the paper could support greater inclusion of Bohmian trajectories in quantum mechanics education and computational practice, potentially aiding analytical tools in related fields. However, the absence of new derivations, quantitative benchmarks, or direct engagement with foundational no-go theorems limits its technical impact to interpretive discussion rather than advancing core methods or resolving longstanding objections.

major comments (3)
  1. [Abstract] Abstract and introduction: The assertion that observed community acceptance and practical applications since the 1990s suffice to declare Bohmian mechanics a 'legitimate quantum representation' is not supported by any derivation showing how the hydrodynamic formulation evades or modifies the non-contextuality assumptions underlying von Neumann's theorem, which the paper itself identifies as the original motivation.
  2. [Schrödinger equation discussion] Section re-examining the Schrödinger equation: The claim of a 'less restrictive view' is advanced without explicit formal comparison (e.g., to the standard derivation of the continuity equation or probability current) or quantitative metrics demonstrating improved insight or computational advantage over conventional treatments.
  3. [Numerical examples] Numerical examples section: The manuscript references specific examples but provides no error-controlled benchmarks, convergence data, or direct comparisons to alternative methods (such as standard wave-function propagation), undermining the claim of suitability as a practical analytical tool.
minor comments (2)
  1. The abstract is lengthy and could be condensed to focus more sharply on the central pragmatic argument.
  2. Additional citations to post-1990s applications of Bohmian mechanics would strengthen the historical narrative of the shift in attitude.

Simulated Author's Rebuttal

3 responses · 0 unresolved

We thank the referee for the constructive report. Our manuscript is an interpretive discussion of the observed pragmatic shift in Bohmian mechanics toward hydrodynamic use, not a source of new derivations or quantitative benchmarks. We address each major comment below, indicating revisions where they strengthen clarity without altering the paper's scope.

read point-by-point responses
  1. Referee: [Abstract] Abstract and introduction: The assertion that observed community acceptance and practical applications since the 1990s suffice to declare Bohmian mechanics a 'legitimate quantum representation' is not supported by any derivation showing how the hydrodynamic formulation evades or modifies the non-contextuality assumptions underlying von Neumann's theorem, which the paper itself identifies as the original motivation.

    Authors: We agree the manuscript provides no new derivation addressing von Neumann's theorem or non-contextuality. The claim of legitimacy is grounded in documented community practice and applications since the 1990s, where the hydrodynamic picture functions operationally regardless of hidden-variable ontology. The original motivation is presented only as historical background. We will revise the abstract and introduction to explicitly separate historical context from the pragmatic argument. revision: yes

  2. Referee: [Schrödinger equation discussion] Section re-examining the Schrödinger equation: The claim of a 'less restrictive view' is advanced without explicit formal comparison (e.g., to the standard derivation of the continuity equation or probability current) or quantitative metrics demonstrating improved insight or computational advantage over conventional treatments.

    Authors: The less restrictive view treats the hydrodynamic equations as a valid analytical representation without requiring ontological commitment to trajectories as hidden variables. We will add an explicit side-by-side comparison to the standard derivation of the continuity equation and probability current from the Schrödinger equation to clarify equivalence and the trajectory-based perspective. Quantitative metrics are outside the manuscript's interpretive scope and will not be added. revision: partial

  3. Referee: [Numerical examples] Numerical examples section: The manuscript references specific examples but provides no error-controlled benchmarks, convergence data, or direct comparisons to alternative methods (such as standard wave-function propagation), undermining the claim of suitability as a practical analytical tool.

    Authors: The examples are drawn from existing literature to illustrate pragmatic adoption, not new computations performed here. We will revise the section to state this explicitly and add citations to published works containing error-controlled benchmarks and comparisons to standard propagation methods, thereby supporting the practical-utility claim through reference rather than new data. revision: yes

Circularity Check

0 steps flagged

No significant circularity in the historical and pragmatic argument

full rationale

The paper advances a historical and interpretive discussion of shifting attitudes toward Bohmian mechanics, citing its practical use as an analytical tool and re-examining the Schrödinger equation plus numerical examples. No load-bearing derivation, equation, or parameter fit is presented that reduces by construction to its own inputs, self-citations, or ansatzes. The central claim equates observed community acceptance with legitimacy for teaching without invoking uniqueness theorems, fitted predictions, or self-referential definitions; the argument remains self-contained as opinion grounded in external usage trends rather than internal loops.

Axiom & Free-Parameter Ledger

0 free parameters · 1 axioms · 0 invented entities

The claim rests on standard quantum mechanics via the Schrödinger equation and historical observation of community attitudes; no new free parameters, ad-hoc axioms, or invented entities are introduced.

axioms (1)
  • standard math The Schrödinger equation remains the valid dynamical law for quantum systems.
    The paper states it re-examines the Schrödinger equation under a less restrictive view.

pith-pipeline@v0.9.0 · 5523 in / 1223 out tokens · 48425 ms · 2026-05-16T14:40:58.857879+00:00 · methodology

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extends
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uses
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contradicts
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unclear
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Reference graph

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