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arxiv: 2607.01374 · v1 · pith:IS4SWWZW · submitted 2026-07-01 · math.DS

Algebraic conditions for second-moment stability boundaries of linear, time-invariant stochastic delay-differential equations

Zsolt Iklodi , Harry Dankowicz This is my paper

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classification math.DS
keywords stochastic delay-differential equationssecond-moment stabilityalgebraic stability conditionsboundary-value problemscorrelation functionsmultiplicative noiseparameter continuationinfinitesimal generator
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The pith

Algebraic equality conditions identify second-moment stability boundaries for stochastic delay equations without discretization.

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

This paper derives optimal semi-analytic algebraic equality conditions for locating the boundaries at which second-moment stability is lost in linear time-invariant stochastic delay-differential equations that include a single constant delay together with both multiplicative and additive noise. The conditions arise from reducing an advection-type boundary-value problem for a three-variable correlation function to a delay-differential boundary-value problem for a two-variable correlation function, then equating stability loss with loss of uniqueness of stationary solutions to the reduced problem. A reader would care because these boundaries determine whether the statistical second moments of the solution remain bounded, which governs long-term behavior in applications such as control or biological systems subject to delay and noise. The resulting conditions scale only with the square of the system dimension and support direct use of parameter continuation methods; in the one-dimensional case they become fully closed-form expressions in elementary functions. Validation against Monte Carlo simulations and earlier published results for low-dimensional models shows agreement while avoiding the computational cost of discretization.

Core claim

For linear time-invariant stochastic delay-differential equations with a single constant delay and both multiplicative and additive noise, second-moment stability boundaries are identified with the loss of uniqueness of stationary solutions to a reduced delay-differential boundary-value problem for a two-variable correlation function. This identification is motivated by the observation that stability is lost when a real eigenvalue of the discretization of the corresponding infinitesimal generator passes through the origin. The reduction begins with an advection-type boundary-value problem with non-local boundary conditions for a three-variable correlation function. The resulting algebraic eq

What carries the argument

The reduced delay-differential boundary-value problem for the two-variable correlation function, whose stationary solutions lose uniqueness exactly at the second-moment stability boundaries.

If this is right

  • Second-moment stability boundaries become computable by applying parameter continuation directly to the discretization-free algebraic equality conditions.
  • Computational effort scales only with the square of the system dimension rather than with a chosen discretization resolution.
  • In the one-dimensional case the stability condition reduces to an explicit expression in elementary functions.
  • The algebraic conditions can be used to test and clarify limitations of previously published stability criteria for the same class of equations.

Where Pith is reading between the lines

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

  • The same reduction strategy could be examined for systems with multiple distinct delays if analogous correlation equations can be derived.
  • The algebraic conditions supply a practical test that could be embedded inside optimization routines seeking parameter values that keep second moments stable.
  • Higher-dimensional numerical implementations of the equality conditions could be benchmarked against existing discretization codes to quantify the scaling advantage beyond the low-dimensional examples already checked.

Load-bearing premise

Second-moment stability is lost precisely when a real eigenvalue of the discretized infinitesimal generator passes through the origin, which corresponds to non-uniqueness of stationary solutions to the reduced correlation boundary-value problem.

What would settle it

A Monte Carlo simulation of a concrete low-dimensional stochastic delay equation in which the algebraic condition predicts a stability boundary but the simulated second moments either remain bounded or diverge on the opposite side of the predicted curve.

Figures

Figures reproduced from arXiv: 2607.01374 by Harry Dankowicz, Zsolt Iklodi.

Figure 1
Figure 1. Figure 1: Domains of definition for the solutions to the covariance and [PITH_FULL_IMAGE:figures/full_fig_p006_1.png] view at source ↗
Figure 2
Figure 2. Figure 2: Analytic first-moment stability bounds of a scalar SDDE of the [PITH_FULL_IMAGE:figures/full_fig_p008_2.png] view at source ↗
Figure 3
Figure 3. Figure 3: Parameter regions (shaded pink) in the ( [PITH_FULL_IMAGE:figures/full_fig_p010_3.png] view at source ↗
Figure 4
Figure 4. Figure 4: (a) Stationary solutions ϕ¯(ϑ) to the scalar correlation boundary-value problem; (b) eigenvalues of the corresponding discretized (M = 20) covariance matrix in (31) given Ct(θ, ϑ) = C¯(θ, ϑ) = ϕ¯ (−|θ − ϑ|); and (c) variations of χ in Eq. (54) (red) and the spectral abscissa ρ(F) (blue) for F = A ⊕ A + B ⊗ B and A and B in (40) and (37) under variations in a and given τ = 1, b = −2, α = −1.5, β = 0.5, γ = … view at source ↗
Figure 5
Figure 5. Figure 5: (a) Stationary solutions ϕ¯(ϑ) to the scalar correlation boundary-value problem; (b) eigenvalues of the corresponding discretized covariance (M = 20) matrix in (31) given Ct(θ, ϑ) = C¯(θ, ϑ) = ϕ¯ (−|θ − ϑ|); and (c) variations of χ in Eq. (54) (red) and the spectral abscissa ρ(F) (blue) for F = A ⊕ A + B ⊗ B and A and B in (40) and (37) under variations in a and given τ = 1, b = 0, α = −1.5, β = 0.5, γ = 1… view at source ↗
Figure 6
Figure 6. Figure 6: Candidate second-moment stability boundaries for the scalar [PITH_FULL_IMAGE:figures/full_fig_p014_6.png] view at source ↗
Figure 7
Figure 7. Figure 7: Candidate second-moment stability boundaries for the scalar [PITH_FULL_IMAGE:figures/full_fig_p016_7.png] view at source ↗
Figure 12
Figure 12. Figure 12: For a parameter combination securely within the pre￾dicted region of second-moment stability, panel (c) in [PITH_FULL_IMAGE:figures/full_fig_p016_12.png] view at source ↗
Figure 8
Figure 8. Figure 8: Numeric study for point A (a = −3.0, b = 1.0) from [PITH_FULL_IMAGE:figures/full_fig_p017_8.png] view at source ↗
Figure 9
Figure 9. Figure 9: Numeric study of point B (a = −3.0, b = 2.1) from Fig.7, for which Eq. (1) is predicted by the theory in this paper to be both first- and second-moment stable (ρ(A) = −0.264, ρ(F) = −0.303). For legends, see the description of panels (a), (d), and (f) in the caption of Fig.8 [PITH_FULL_IMAGE:figures/full_fig_p018_9.png] view at source ↗
Figure 10
Figure 10. Figure 10: Numeric study of point C (a = −0.4, b = −0.9) from Fig.7, for which Eq. (1) is predicted by the theory in this paper to be first- but not second-moment stable (ρ(A) = −0.511, ρ(F) = 1.288). For legends, see the description of panels (a) and (d) in the caption of Fig.8. well-informed choice for these parameters is crucial for ensuring stable and reliable material removal without un￾wanted, harmful chatter … view at source ↗
Figure 11
Figure 11. Figure 11: Numeric study of point D (a = 1.0, b = −1.5) from Fig.7, for which Eq. (1) is predicted by the theory in this paper to neither first- nor second-moment stable (ρ(A) = 0.273, ρ(F) = 4.149). For legends, see the description of panels (a) and (d) in the caption of Fig.8. diagram. Panel (A) shows a desirable operation, where both the mean and variance settle to a stationary solu￾tion. In contrast, panel (B) d… view at source ↗
Figure 12
Figure 12. Figure 12: Numeric study of a noisy, single-degree-of-freedom model of an inverted pendulum subjected to delayed feedback control ( [PITH_FULL_IMAGE:figures/full_fig_p020_12.png] view at source ↗
Figure 13
Figure 13. Figure 13: First and second-moment stability map and the results of stochastic integration for a single-degree-of-freedom mathematical model [PITH_FULL_IMAGE:figures/full_fig_p021_13.png] view at source ↗
read the original abstract

For linear, time-invariant stochastic delay-differential equations with a single constant delay and both multiplicative and additive noise, this paper derives optimal semi-analytic algebraic equality conditions that can be used to identify second-moment stability boundaries without the use of problem discretization. Successful validation against Monte Carlo simulations and published results for several low-dimensional models clarifies limitations of stability conditions proposed in the literature and demonstrates considerable savings in computational effort relative to discretization-based approaches. In particular, using the theory derived in this paper, second-moment stability boundaries are shown to be computable using parameter continuation techniques applied to discretization-free equality conditions that scale only with the square of the problem dimension. For the case of one-dimensional stochastic delay-differential equations, in particular, the analysis is entirely closed form with a stability condition expressed entirely in terms of elementary functions. These results are enabled by the derivation of an advection-type boundary-value problem with non-local boundary conditions for a three-variable correlation function followed by a reduction to a delay-differential boundary-value problem for a two-variable correlation function. For the former problem, observations regarding the spectral abscissa of the discretization of the corresponding infinitesimal generator, particularly that second-moment stability is lost when a real eigenvalue passes through the origin, motivate identification of second-moment stability boundaries with a loss of uniqueness of stationary solutions to the latter problem.

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

2 major / 0 minor

Summary. The manuscript derives semi-analytic algebraic equality conditions for second-moment stability boundaries of linear time-invariant stochastic delay-differential equations with constant delay and both multiplicative and additive noise. It proceeds by deriving an advection-type BVP for a three-variable correlation function, reducing it to a delay-differential BVP for a two-variable correlation function, and identifying stability boundaries with parameter values at which the reduced BVP loses uniqueness of stationary solutions; this identification is motivated by the observation that, on a discretized infinitesimal generator, stability is lost precisely when a real eigenvalue crosses the origin. The resulting conditions are validated against Monte Carlo simulations and published results for low-dimensional models, with closed-form expressions available for the scalar case, and are shown to enable discretization-free parameter continuation that scales with the square of the system dimension.

Significance. If the central identification between stability loss and loss of uniqueness in the reduced BVP can be placed on a rigorous footing, the work supplies a scalable, discretization-free route to stability boundaries that improves computational cost relative to existing methods and clarifies limitations of prior algebraic conditions in the literature.

major comments (2)
  1. [Abstract] Abstract: the equivalence between second-moment stability boundaries and loss of uniqueness of stationary solutions to the reduced two-variable delay-differential BVP is motivated solely by the numerical observation that a real eigenvalue of the discretized infinitesimal generator crosses the origin; no direct spectral analysis of the continuous (infinite-dimensional) operator is supplied to show that other crossings (complex eigenvalues, essential spectrum) cannot produce instability without a real zero eigenvalue, nor is a rigorous passage-to-the-limit argument given that the discretized crossing implies the continuous one.
  2. [Abstract] Abstract: because the algebraic conditions are obtained exactly by imposing the non-uniqueness condition on the reduced BVP, the absence of a continuous-operator justification for the identification directly undermines the claim that the resulting equalities locate the true stability boundaries.

Simulated Author's Rebuttal

2 responses · 1 unresolved

We thank the referee for the careful reading and for highlighting the need for greater rigor in the central identification of our work. We respond to the major comments point by point below.

read point-by-point responses

  1. Referee: [Abstract] Abstract: the equivalence between second-moment stability boundaries and loss of uniqueness of stationary solutions to the reduced two-variable delay-differential BVP is motivated solely by the numerical observation that a real eigenvalue of the discretized infinitesimal generator crosses the origin; no direct spectral analysis of the continuous (infinite-dimensional) operator is supplied to show that other crossings (complex eigenvalues, essential spectrum) cannot produce instability without a real zero eigenvalue, nor is a rigorous passage-to-the-limit argument given that the discretized crossing implies the continuous one.

    Authors: We agree that the identification is motivated by the observed crossing of a real eigenvalue through the origin in the discretized generator and that no direct spectral analysis of the continuous operator (addressing complex eigenvalues or essential spectrum) or passage-to-the-limit argument is provided. In the revised manuscript we have added explicit language in the abstract and introduction stating that the algebraic conditions rest on this numerically motivated identification, and we have inserted a brief discussion of why other crossings are not expected on the basis of the structure of the correlation equations. A complete operator-theoretic proof lies beyond the present scope. revision: partial

  2. Referee: [Abstract] Abstract: because the algebraic conditions are obtained exactly by imposing the non-uniqueness condition on the reduced BVP, the absence of a continuous-operator justification for the identification directly undermines the claim that the resulting equalities locate the true stability boundaries.

    Authors: The referee is correct that, without a rigorous continuous-operator justification, the derived equalities locate the stability boundaries only under the stated identification. We have revised the abstract to describe the conditions as those obtained by imposing non-uniqueness on the reduced BVP under the identification supported by discretization evidence and low-dimensional validation, rather than asserting an unconditional equivalence. The computational advantages and empirical agreement with Monte Carlo simulations remain as reported. revision: partial

standing simulated objections not resolved
  • A rigorous spectral analysis of the continuous infinite-dimensional operator establishing that stability loss occurs precisely when a real eigenvalue crosses the origin, together with a passage-to-the-limit argument from the discretized to the continuous setting.

Circularity Check

0 steps flagged

No circularity; algebraic conditions derived directly from BVP non-uniqueness without reduction to inputs by construction

full rationale

The paper reduces the three-variable correlation-function BVP to a two-variable delay-differential BVP and obtains the algebraic equality conditions by imposing the non-uniqueness condition on stationary solutions of the reduced problem. This derivation step is independent of the target stability data and is not shown to be tautological or statistically forced. The identification of stability boundaries with loss of uniqueness is motivated by a discretization observation, but that motivation is external to the algebraic derivation itself and does not create a self-definitional or fitted-input loop. No load-bearing self-citation, uniqueness theorem imported from the authors, or ansatz smuggled via citation is indicated. The chain from BVP to algebraic conditions is therefore self-contained.

Axiom & Free-Parameter Ledger

0 free parameters · 0 axioms · 0 invented entities

Abstract supplies no explicit free parameters, ad-hoc axioms, or invented entities; the derivation relies on standard existence and spectral properties of linear operators on function spaces.

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