Microlocal analysis, Control for Partial Differential Equations
Propagation of singularities, Controllability/Observability, Stabilisation for wave and dispersive equations :
1. Geometric condition for observability of electromagnetic Schr"odinger operators, with K. Le Balc'h and J. Niu, submitted, [arXiv].
2. Quantitative observability for one-dimensional Schr"odinger equations with potentials, with Pei Su and Xu Yuan, J. Funct. Analysis (2025), Vol.288, 2, [arXiv].
3. Sharp resolvent estimate for the Baouendi-Grushin operator and applications, [with V. Arnaiz], Comm. Math. Phys. 400 (2023), no. 1, 541–637. [Arxiv] Slide
Remark: This work contains the detailed construction and propagation of semiclassical microlocal measures in the subelliptic regime for quasimodes of the Baouendi-Grushin operator.
4. Sharp decay rate for the damped wave equations with convex-shaped damping, Int. Math. Res. Not. IMRN (2023), no. 7, 5905–5973. [Arxiv] Slide
5. Decays rates for Kelvin-Voigt damped wave equations II: the geometric control condition, [with N. Burq], Proc. Amer. Math. Soc. 150 (2022), 1021-1039, arXiv
6. Decays for Kelvin-Voigt damped wave equation: Piece-wise smooth damping, [with N. Burq], J. London. Math. Soc.(2), 106 (2022), no. 1, 446-483. arXiv
7. Time-optimal controllability and observability for Grushin Schrödinger equation, [with N. Burq], Analysis & PDE, Vol. 15 (2022), No. 6, 1487-1530. arXiv
8. Observability of Bouendi-Grushin type equations through resolvent estimates, [with C. Letrouit], J. Inst. Math. Jussieu. 22, No. 2, 541-579 (2023), arXiv
9. Semi-classical propagation of singularities for Stokes system, Comm. Partial Differential Equations, 45:8, 970-1030, [Arxiv]
10. On the stabilization of a hyperbolic Stokes system under geometric control condition. [with F.-W. -Chaves-Silva], Z. Angew. Math. Phys. 71, 139 (2020). [Arxiv]
11. Internal controllability for the Kadomtsev-Petviashvili II equation. [with I. Rivas], SIAM Journal on Control and Optimization 58(3):1715-1734, [Arxiv]
12. Exact controllability of linear KP-I equation. (16 pages), permanent preprint, [Arxiv] :
Remark: This manuscript is a chapter of my PhD thesis and is a natural supplementary of the controllability for the KP-II paper. The result is truth worthy, but for some reason, I intend not to publish it in a journal.
My PhD thesis
Analysis for Nonlinear partial differential equations.
Nonlinear dispersive equations with randomness:
1. Almost sure global nonlinear smoothing for the 2D NLS, [with N. Tzvetkov], arXiv
2. Probabilistic well-posedeness for the nonlinear Schrödinger equation on the 2d sphere I: positive regularities, [with N. Burq, N. Camps, N. Tzvetkov], arXiv.
3. The Second Picard iteration of NLS on the 2d sphere does not regularize Gaussian random initial data, [with N. Burq, N. Camps, M. Latocca, N. Tzvetkov], EMS Survey 2025, 12 (2025), no. 1, 123–154. arXiv.
4. Quasi-invariance of Gaussian measures for the 3d energy critical nonlinear Schr"odinger equations, [with N. Tzvetkov], Comm. Pure Appl. Math, 78 (2025), no. 12, 2305-2353. arXiv.
5. Refined probabilistic well-posedness for the weakly dispersive NLS, [with N. Tzvetkov], Nonlinear Analysis, 213(11): 112530., arXiv.
6. Gibbs measure dynamics for the fractional nonlinear Schrödinger equation, [with N. Tzvetkov], SIAM J. Math. Anal., 52(5), 4638–4704. arxiv.org/abs/1912.07303
7. New examples of probabilistic well-posedness for nonlinear wave equations. [with N. Tzvetkov], J. Funct. Analysis. 278 (2020), 108322, [Arxiv]
8. Weak universality for a class of nonlinear wave equations, [with N. Tzvetkov and Weijun Xu], to appear in Ann. Inst. Fourier, arXiv.
Related overview Universality results for a class of nonlinear wave equations and their Gibbs measures , Séminaire Laurent Schwartz — EDP et applications (2021-2022), Exposé no. 15, 10 p.
9. Probabilistic well-posedness for supercritical wave equations with periodic boundary condition on dimension three. [with B. Xia], Illinois J. Math. 60(2016), no.2, 481-503 [Arxiv]
Other works on nonlinear PDEs:
1. Hyperbolic nonlinear Schrödinger equations on R × T, [with E. Başakoğlu, N. Tzvetkov, Yuzhao Wang], special issue in Partial Diff. Equa. Appl., Vol. 6, 51 (2025) preprint.
1. Local well-posedness for the periodic Boltzmann equation with constant collision kernel, [with E. Başakoğlu, N. Tzvetkov, Yuzhao Wang], to appear in J. Funct. Analysis, preprint
3. On the pathological set in probabilistic well-posedness of nonlinear wave equations, [with N. Tzvetkov], Comptes Rendus Mathematique, Tome 358 (2020) no.9-10, pp. 989-999. arxiv.org/abs/2001.10293 Slide
Remark: A full proof of $G_{\delta}$ dense structure of the pathological set is contained in the updated arXiv version. A better understanding of this type of strong ill-posedness is recently achieved by Camps-Gassot where they proved the result for NLS.
4. Low regularity blowup solutions for the mass-critical NLS in higher dimensions. [with J. Zheng], Journal de Mathématiques Pures et Appliquées, 134 (2020) 255-298, [Arxiv]
5. Scattering below ground state of focusing fractional nonlinear Schrödinger equation with radial data. [with H. Wang, X. Yao, J. Zheng], Discrete and Continuous Dynamical Systems, 2018,38(4):2207-2228 [Arxiv]
Other writings: expository notes, slides, ...
2. Note on the Gibbs measure for the mass-critical focusing NLS
3. Groupe de Travail note (organized by Francis Nier, March 2025) on the derivation of the linear Boltzmann equation from random Schrödinger equation (after Erdös-Yau): Part I, Part II, Part III, Part IV