The higher order fractional Calderón problem for linear local operators: uniqueness

G Covi, K Mönkkönen, J Railo, G Uhlmann - Advances in Mathematics, 2022‏ - Elsevier
We study an inverse problem for the fractional Schrödinger equation (FSE) with a local
perturbation by a linear partial differential operator (PDO) of order smaller than the one of …

Fractional Calderón problems and Poincaré inequalities on unbounded domains

J Railo, P Zimmermann - Journal of Spectral Theory, 2023‏ - ems.press
We generalize many recent uniqueness results on the fractional Calderón problem to cover
the cases of all domains with nonempty exterior. The highlight of our work is the …

Unique continuation property and Poincar\'e inequality for higher order fractional Laplacians with applications in inverse problems

G Covi, K Mönkkönen, J Railo - arxiv preprint arxiv:2001.06210, 2020‏ - arxiv.org
We prove a unique continuation property for the fractional Laplacian $(-\Delta)^ s $ when $
s\in (-n/2,\infty)\setminus\mathbb {Z} $. In addition, we study Poincar\'e-type inequalities for …

On corners scattering stably and stable shape determination by a single far-field pattern

ELK Blåsten, H Liu - Indiana University Mathematics Journal, 2021‏ - JSTOR
In this paper, we establish two sharp quantitative results for the direct and inverse time-
harmonic acoustic wave scattering. The first one is concerned with the recovery of the …

An inverse problem for the fractional Schrödinger equation in a magnetic field

G Covi - Inverse Problems, 2020‏ - iopscience.iop.org
This paper shows global uniqueness in an inverse problem for a fractional magnetic
Schrödinger equation (FMSE): an unknown electromagnetic field in a bounded domain is …

[HTML][HTML] Inverse problems for a fractional conductivity equation

G Covi - Nonlinear Analysis, 2020‏ - Elsevier
This paper shows global uniqueness in two inverse problems for a fractional conductivity
equation: an unknown conductivity in a bounded domain is uniquely determined by …

Variational approach for the Stokes and Navier–Stokes systems with nonsmooth coefficients in Lipschitz domains on compact Riemannian manifolds

M Kohr, WL Wendland - Calculus of Variations and Partial Differential …, 2018‏ - Springer
The purpose of this paper is to show well-posedness results for Dirichlet problems for the
Stokes and Navier–Stokes systems with L^ ∞ L∞-variable coefficients in L^ 2 L 2-based …

A fully-discrete virtual element method for the nonstationary Boussinesq equations in stream-function form

LB da Veiga, D Mora, A Silgado - Computer Methods in Applied Mechanics …, 2023‏ - Elsevier
In the present work we propose and analyze a fully-coupled virtual element method of high
order for solving the two dimensional nonstationary Boussinesq system in terms of the …

On the degree of ill-posedness of multi-dimensional magnetic particle imaging

T Kluth, B **, G Li - Inverse Problems, 2018‏ - iopscience.iop.org
Magnetic particle imaging is an imaging modality of relatively recent origin, and it exploits
the nonlinear magnetization response for reconstructing the concentration of nanoparticles …

Low-rank MDPs with Continuous Action Spaces

M Oprescu, A Bennett, N Kallus - … Conference on Artificial …, 2024‏ - proceedings.mlr.press
Abstract Low-Rank Markov Decision Processes (MDPs) have recently emerged as a
promising framework within the domain of reinforcement learning (RL), as they allow for …