arXiv:2606.29352v2

Exponential Mixing for 2D Stochastic Damped Euler Equation Driven by Bounded Noise

Rui Bai, Chunrong Feng, Huaizhong Zhao

math.PRmath.AP60H1537A2535Q3135R60

Abstract

In this paper, we study the long-time behaviour of the two-dimensional stochastic damped Euler equation on the torus driven by bounded random forcing. Unlike stochastic Navier-Stokes or fractionally dissipative Euler equations, the model possesses no viscous regularisation, so the classical parabolic smoothing is unavailable. We prove that when the damping coefficient is sufficiently large, the associated Markov semigroup admits a unique invariant measure and converges exponentially fast to equilibrium. The key ingredient is the establishment of a global-in-time W1,W^{1,\infty} estimate for the vorticity. This estimate yields a compact absorbing mechanism in C(T2)C(\mathbb{T}^2), which enables us to establish the uniqueness of the invariant measure and exponential mixing. To the best of our knowledge, this is the first exponential mixing result for a genuinely inviscid stochastic Euler-type equation. Our approach demonstrates that sufficiently strong linear damping can effectively replace the compactness mechanism usually provided by viscosity and is expected to be applicable to other inviscid or weakly dissipative stochastic partial differential equations driven by bounded random forcing.

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Audited against arXiv v2

Not a correctness certificate. A “Correct” result may include yellow typos or minor formal corrections that do not affect substantive soundness. It means this audit found no unresolved substantive error under the stated criteria; it does not replace expert scrutiny or formal verification.

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Generated August 18, 2026
01Statements2 reported findingsCorrect

The global well-posedness, invariant-measure uniqueness, and exponential mixing statements for the two-dimensional damped Euler equation with bounded noise are correct in the stated phase space and parameter regime.

Theorems 1.1–1.3Correct

Dissipation and coupling yield the claimed exponential mixing

Pages 3–6 and Sections 3–6 · arXiv:2606.29352v2

Vorticity transport with damping preserves the uniform W1,W^{1,\infty} bounds needed for global solutions. The bounded kick law supplies a controllable low-mode component, while high modes contract under the damped dynamics. A same-noise coupling, followed by the low-mode correction, gives a strict Wasserstein contraction on the absorbing set; Lyapunov return estimates extend it globally and imply a unique invariant measure with exponential convergence.

Full paper, version 2
Theorems 2.1, 3.3, and 4.1Correct

Well-posedness, stability, and weak-star continuity use compatible regularity

Sections 2–4 · arXiv:2606.29352v2

The logarithmic Biot–Savart control closes the W1,pW^{1,p} bounds for p>2p>2, damping prevents escape of the vorticity norm, and approximation yields the announced solutions. The stability estimate is strong enough for uniqueness and for continuity of the Markov evolution in the weak-star topology used later.

02Proofs2 reported findingsCorrect

The PDE estimates, Markov regularity, absorbing-set construction, and coupling proof are correct and complete.

Sections 3–6 and Appendix ACorrect and complete

The pathwise estimates support the Markov and coupling steps

Pages 8–29 · Sections 3–6 and Appendix A · arXiv:2606.29352v2

Characteristics give uniqueness despite the low regularity of vorticity, Biot–Savart estimates control the velocity, and damping closes the uniform derivative bounds. Compactness is taken in a topology compatible with the strong solution estimates, and the weak-star passage is backed by uniform spatial regularity. The coupling probabilities and contraction constants are uniform on the absorbing set.

Sections 4–6Correct and complete

Tightness, invariance, and coupling support the ergodic conclusions

Pages 26–46 · arXiv:2606.29352v2

The W1,1W^{-1,1} metric metrizes the needed weak-star convergence on bounded sets, moment estimates make occupation measures tight, and Feller continuity passes invariance to a limit. An absorbing estimate followed by a quantitative coupling contraction gives uniqueness and the stated exponential convergence rate.

03Novelty0 reported findingsNo non-novelty findings

No non-novelty findings.

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Paper
arXiv:2606.29352v2
Authors listed
Rui Bai, Chunrong Feng, Huaizhong Zhao
Audit date
August 18, 2026
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