arXiv:2607.02777v1

Hypocoercivity for Hamiltonian Diffusions with Singular Drift

Zhen-Qing Chen, Martin Grothaus, Onno Pfohl

math.PRmath-ph37A2560H1037J2547D07

Abstract

We establish L2L^2-exponential strong ergodicity (strong mixing) with an explicit rate of convergence for a class of degenerate diffusions with multiplicative noise and with singular drift in both the noisy and noise-free components. This class includes diffusions with an additional inert drift given by the gradient of a singular potential, as well as singular generalized stochastic Hamiltonian systems. Cases in which the diffusion is confined to a proper, bounded or unbounded subset of Rd1+d2\mathbb{R}^{d_1+d_2} are included. Concrete examples of admissible potentials are provided. To obtain these results, we use an analytical approach and study the long-time behavior of the strongly continuous contraction semigroup generated by the formal Kolmogorov backward operator. Using the theory of generalized Dirichlet forms, these objects are then identified with the transition semigroup and generator of the unique weak solution to the original stochastic differential equation. The existence and uniqueness of this solution are established under near-minimal conditions.

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Audited against arXiv v1

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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Detailed mathematical audit

Generated August 18, 2026
01Statements2 reported findingsCorrect

The weak well-posedness, semigroup identification, and quantitative hypocoercivity results for Hamiltonian diffusions with singular drift are correct under the stated form-boundedness and coercivity assumptions.

Theorems 1.1, 1.2, and 1.6Correct

The singular diffusion is realized by the hypocoercive semigroup

Pages 3–8 and Sections 3–6 · arXiv:2607.02777v1

The singular antisymmetric drift is controlled at the quadratic-form level, so the closed accretive form defines a Markov semigroup. The abstract modified-energy estimate combines microscopic coercivity, macroscopic coercivity, and the bounded commutator terms to give the stated exponential rate. Approximation of the drift and tightness identify the martingale solution with this semigroup, yielding existence and uniqueness in law.

Full paper, version 1
Theorems 1.1 and 1.6Correct

The closed semigroup is correctly identified with weak solutions of the SDE

Pages 3–10 and Section 6 · arXiv:2607.02777v1

The distributional drift is controlled through the Kolmogorov form, and the later martingale-problem theorem imposes the coefficient hypotheses needed to identify its Markov semigroup with the stochastic equation. Uniqueness of that semigroup then gives uniqueness in law for arbitrary initial distributions.

02Proofs2 reported findingsCorrect

The form construction, hypocoercive energy estimate, approximation, and martingale-problem arguments are correct and complete.

Sections 3–6 and appendicesCorrect and complete

The singular terms are controlled without hidden smoothness

Pages 10–40 · Sections 3–6 and appendices · arXiv:2607.02777v1

All integrations by parts are first performed for regularized coefficients and then passed through uniform form bounds. The auxiliary hypocoercive operator is bounded on the announced spaces, each commutator term is absorbed by the chosen constants, and the limiting martingale problem has enough resolvent uniqueness to identify all subsequential limits.

Sections 3–6Correct and complete

Closure, commutator coercivity, and martingale identification form complete proof chains

Pages 13–53 · arXiv:2607.02777v1

Regularized forms satisfy uniform energy bounds and pass to the distributional drift on a core, giving essential dissipativity. Block commutators transfer coercivity to the degenerate variables with the constants used in the rate, and approximation plus generator convergence closes the martingale-problem identification.

03Novelty0 reported findingsNo non-novelty findings

No non-novelty findings.

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Paper
arXiv:2607.02777v1
Authors listed
Zhen-Qing Chen, Martin Grothaus, Onno Pfohl
Audit date
August 18, 2026
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