Analysis of Partial Differential Equations (APDE)
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Convergence over fractals for the Schrödinger equation
(2021-01)We consider a fractal refinement of the Carleson problem for the Schrödinger equation, that is to identify the minimal regularity needed by the solutions to converge pointwise to their initial data almost everywhere with ... -
Multilinear operator-valued calderón-zygmund theory
(Journal of Functional Analysis, 2020)We develop a general theory of multilinear singular integrals with operator- valued kernels, acting on tuples of UMD Banach spaces. This, in particular, involves investigating multilinear variants of the R-boundedness ... -
Invariant measures for the dnls equation
(Mathematics of Wave Phenomena, 2020-10-02)We describe invariant measures associated to the integrals of motion of the periodic derivative nonlinear Schr\"odinger equation (DNLS) constructed in \cite{MR3518561, Genovese2018}. The construction works for small $L^2$ ... -
End-point estimates, extrapolation for multilinear muckenhoupt classes, and applications
(Trans. Amer. Math. Soc.2020, 2019)In this paper we present the results announced in the recent work by the first, second, and fourth authors of the current paper concerning Rubio de Francia extrapolation for the so-called multilinear Muckenhoupt classes. ... -
Magnetic domain-twin boundary interactions in Ni-Mn-Ga
(Acta Materialia, 2020-04)The stress required for the propagation of twin boundaries in a sample with fine twins increases monotonically with ongoing deformation. In contrast, for samples with a single twin boundary, the stress exhibits a plateau ... -
Sensitivity of twin boundary movement to sample orientation and magnetic field direction in Ni-Mn-Ga
(Acta Materialia, 2019)When applying a magnetic field parallel or perpendicular to the long edge of a parallelepiped Ni- Mn-Ga stick, twin boundaries move instantaneously or gradullay through the sample. We evaluate the sample shape dependence ... -
Generalized Poincaré-Sobolev inequalities
(2020-12)Poincaré-Sobolev inequalities are very powerful tools in mathematical analysis which have been extensively used for the study of differential equations and their validity is intimately related with the geometry of the ... -
Sparse and weighted estimates for generalized Hörmander operators and commutators
(Monatshefte für Mathematik, 2019)In this paper a pointwise sparse domination for generalized Ho ̈rmander and also for iterated commutators with those operators is provided generalizing the sparse domination result in [24]. Relying upon that sparse domination ... -
The Well Order Reconstruction Solution for Three-Dimensional Wells, in the Landau-de Gennes theory.
(University of Strathclyde Glasgow, 2019)We study nematic equilibria on three-dimensional square wells, with emphasis on Well Order Reconstruction Solu- tions (WORS) as a function of the well size, characterized by λ, and the well height denoted by ε. The WORS ... -
A sharp lorentz-invariant strichartz norm expansion for the cubic wave equation in \mathbb{R}^{1+3}
(The Quarterly Journal of Mathematics, 2020)We provide an asymptotic formula for the maximal Stri- chartz norm of small solutions to the cubic wave equation in Minkowski space. The leading coefficient is given by Foschi’s sharp constant for the linear Strichartz ... -
Multilinear singular integrals on non-commutative lp spaces
(Springer International Publishing, 2019)We prove Lp bounds for the extensions of standard multilinear Calderón- Zygmund operators to tuples of UMD spaces tied by a natural product structure. The product can, for instance, mean the pointwise product in UMD ... -
Robust numerical methods for nonlocal (and local) equations of porous medium type. Part I: Theory
(SIAM Journal on Numerical Analysis, 2019)Abstract. We develop a unified and easy to use framework to study robust fully discrete numerical methods for nonlinear degenerate diffusion equations ∂tu − Lσ,μ[φ(u)] = f(x,t) in RN × (0,T), where Lσ,μ is a general ... -
Bayesian approach to inverse scattering with topological priors
(Inverse Problems, 2020)We propose a Bayesian inference framework to estimate uncertainties in inverse scattering problems. Given the observed data, the forward model and their uncertainties, we find the posterior distribution over a finite ... -
The Schrödinger equation and Uncertainty Principles
(2020-09)The main task of this thesis is the analysis of the initial data u0 of Schrödinger’s initial value problem in order to determine certain properties of its dynamical evolution. First we consider the elliptic Schrödinger ... -
The observational limit of wave packets with noisy measurements
(2019)The authors consider the problem of recovering an observable from certain measurements containing random errors. The observable is given by a pseudodifferential operator while the random errors are generated by a Gaussian ... -
Scattering with critically-singular and δ-shell potentials
(2019)The authors consider a scattering problem for electric potentials that have a component which is critically singular in the sense of Lebesgue spaces, and a component given by a measure supported on a compact Lipschitz ... -
Topics in Harmonic Analysis; commutators and directional singular integrals
(2020-03-01)This dissertation focuses on two main topics: commutators and maximal directional operators. Our first topic will also distinguish between two cases: commutators of singular integral operators and BMO functions and ... -
Symmetry and Multiplicity of Solutions in a Two-Dimensional Landau–de Gennes Model for Liquid Crystals
(Archive for Rational Mechanics and Analysis, 2020-05-20)We consider a variational two-dimensional Landau–de Gennes model in the theory of nematic liquid crystals in a disk of radius R. We prove that under a symmetric boundary condition carrying a topological defect of degree ... -
Landau-de Gennes Corrections to the Oseen-Frank Theory of Nematic Liquid Crystals
(Archive for Rational Mechanics and Analysis, 2020-01-03)We study the asymptotic behavior of the minimisers of the Landau-de Gennes model for nematic liquid crystals in a two-dimensional domain in the regime of small elastic constant. At leading order in the elasticity constant, ... -
A Scaling Limit from the Wave Map to the Heat Flow Into S2
(Communications in Mathematical Sciences, 2019-07-08)In this paper we study a limit connecting a scaled wave map with the heat flow into the unit sphere 𝕊2. We show quantitatively how the two equations are connected by means of an initial layer correction. This limit is ...
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