Linear and NonLinear Waves
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On the Hausdorff dimension of Riemann's nondifferentiable function
(20210101)Recent findings show that the classical Riemann's nondifferentiable function has a physical and geometric nature as the irregular trajectory of a polygonal vortex filament driven by the binormal flow. In this article, we ... 
A pseudospectral method for the onedimensional fractional Laplacian on R
(20210115)In this paper, we propose a novel pseudospectral method to approximate accurately and efficiently the fractional Laplacian without using truncation. More precisely, given a bounded regular function defined over R, we map ... 
Discrepancy of Minimal Riesz Energy Points
(20211201)We find upper bounds for the spherical cap discrepancy of the set of minimizers of the Riesz senergy on the sphere Sd. Our results are based on bounds for a Sobolev discrepancy introduced by Thomas Wolff in an unpublished ... 
Selfadjointness of twodimensional Dirac operators on corner domains
(20210101)We investigate the selfadjointness of the twodimensional Dirac operator D, with quantumdot and Lorentzscalar ishell boundary conditions, on piecewise C2 domains (with finitely many corners). For both models, we prove ... 
Dirac Operators and Shell Interactions: A Survey
(20210101)In this survey we gather recent results on Dirac operators coupled with δshell interactions. We start by discussing recent advances regarding the question of selfadjointness for these operators. Afterwards we switch to ... 
On the regularity of solutions to the kgeneralized kortewegde vries equation
(20180101)This work is concerned with special regularity properties of solutions to the kgeneralized Kortewegde Vries equation. In [Comm. Partial Differential Equations 40 (2015), 1336–1364] it was established that if the initial ... 
The Frisch–Parisi formalism for fluctuations of the Schrödinger equation
(2022)We consider the solution of the Schrödinger equation $u$ in $\mathbb{R}$ when the initial datum tends to the Dirac comb. Let $h_{\text{p}, \delta}(t)$ be the fluctuations in time of $\int\lvert x \rvert^{2\delta}\lvert ... 
On the Schrödinger map for regular helical polygons in the hyperbolic space
(20220101)The main purpose of this article is to understand the evolution of X t = X s ∧− X ss , with X(s, 0) a regular polygonal curve with a nonzero torsion in the threedimensional Minkowski space. Unlike in the case of the ... 
Pointwise Convergence of the Schr\"odinger Flow
(202101)In this paper we address the question of the pointwise almost everywhere limit of nonlinear Schr\"odinger flows to the initial data, in both the continuous and the periodic settings. Then we show how, in some cases, certain ... 
Quasiinvariance of low regularity Gaussian measures under the gauge map of the periodic derivative NLS
(20220101)The periodic DNLS gauge is an anticipative map with singular generator which revealed crucial in the study of the periodic derivative NLS. We prove quasiinvariance of the Gaussian measure on L2(T) with covariance [1+(−Δ)s]−1 ... 
Numerical approximation of the fractional Laplacian on R using orthogonal families
(20201201)In this paper, using wellknown complex variable techniques, we compute explicitly, in terms of the F12 Gaussian hypergeometric function, the onedimensional fractional Laplacian of the complex Higgins functions, the complex ... 
Vortex Filament Equation for a regular polygon in the hyperbolic plane
(20200709)The aim of this article is twofold. First, we show the evolution of the vortex filament equation (VFE) for a regular planar polygon in the hyperbolic space. Unlike in the Euclidean space, the planar polygon is open and ... 
Riemann's nondifferentiable function and the binormal curvature flow
(20200714)We make a connection between a famous analytical object introduced in the 1860s by Riemann, as well as some variants of it, and a nonlinear geometric PDE, the binormal curvature flow. As a consequence this analytical object ... 
A Hardytype inequality and some spectral characterizations for the Dirac–Coulomb operator
(20200101)We prove a sharp Hardytype inequality for the Dirac operator. We exploit this inequality to obtain spectral properties of the Dirac operator perturbed with Hermitian matrixvalued potentials V of Coulomb type: we characterise ... 
Uniqueness properties of solutions to the BenjaminOno equation and related models
(20200315)We prove that if u1,u2 are real solutions of the BenjaminOno equation defined in (x,t)∈R×[0,T] which agree in an open set Ω⊂R×[0,T], then u1≡u2. We extend this uniqueness result to a general class of equations of BenjaminOno ... 
Asymptotics in Fourier space of selfsimilar solutions to the modified Kortewegde Vries equation
(20200501)We give the asymptotics of the Fourier transform of selfsimilar solutions for the modified Kortewegde Vries equation. In the defocussing case, the selfsimilar profiles are solutions to the Painlevé II equation; although ... 
Evolution of Polygonal Lines by the Binormal Flow
(20200601)The aim of this paper is threefold. First we display solutions of the cubic nonlinear Schrödinger equation on R in link with initial data a sum of Dirac masses. Secondly we show a Talbot effect for the same equation. Finally ... 
On the energy of critical solutions of the binormal flow
(20200702)The binormal flow is a model for the dynamics of a vortex filament in a 3D inviscid incompressible fluid. The flow is also related with the classical continuous Heisenberg model in ferromagnetism, and the 1D cubic ... 
On the improvement of the Hardy inequality due to singular magnetic fields
(20200901)We establish magnetic improvements upon the classical Hardy inequality for two specific choices of singular magnetic fields. First, we consider the AharonovBohm field in all dimensions and establish a sharp Hardytype ... 
On the unique continuation of solutions to nonlocal nonlinear dispersive equations
(20200802)We prove unique continuation properties of solutions to a large class of nonlinear, nonlocal dispersive equations. The goal is to show that if (Formula presented.) are two suitable solutions of the equation defined in ...