Rigorous analysis of the unified transform method and long-range instabilities for the inhomogeneous time-dependent Schrödinger equation on the quarter-plane

A Chatziafratis, T Ozawa, SF Tian - Mathematische Annalen, 2024 - Springer
In this paper, we report on the discovery of a previously-unknown type of long-range
instability phenomenon for the one-dimensional linear Schrödinger (LS) equation on the …

Advances in the study of boundary value problems for nonlinear integrable PDEs

B Pelloni - Nonlinearity, 2015 - iopscience.iop.org
In this review I summarize some of the most significant advances of the last decade in the
analysis and solution of boundary value problems for integrable partial differential equations …

Integral representations for the double-diffusivity system on the half-line

A Chatziafratis, EC Aifantis, A Carbery… - Zeitschrift für angewandte …, 2024 - Springer
A novel method is presented for explicitly solving inhomogeneous initial-boundary-value
problems (IBVPs) on the half-line for a well-known coupled system of evolution partial …

A hybrid analytical-numerical method for solving advection-dispersion problems on a half-line

FPJ De Barros, MJ Colbrook, AS Fokas - International Journal of Heat and …, 2019 - Elsevier
This paper employs the unified transform, also known as the Fokas method, to solve the
advection-dispersion equation on the half-line. This method combines complex analysis with …

Boundary behavior for the heat equation on the half‐line

A Chatziafratis, D Mantzavinos - Mathematical Methods in the …, 2022 - Wiley Online Library
The initial‐boundary value problem for the heat equation on x> 0, t> 0\left {x> 0, t>
0\right\} with nonzero Dirichlet boundary data is studied rigorously, with emphasis on the …

The unified transform for evolution equations on the half‐line with time‐periodic boundary conditions

AS Fokas, MC van der Weele - Studies in Applied Mathematics, 2021 - Wiley Online Library
This paper elaborates on a new approach for solving the generalized Dirichlet‐to‐Neumann
map, in the large time limit, for linear evolution PDEs formulated on the half‐line with time …

Numerical computation of Neumann controls for the heat equation on a finite interval

K Kalimeris, T Özsarı, N Dikaios - IEEE Transactions on …, 2023 - ieeexplore.ieee.org
This article presents a new numerical method, which approximates Neumann type null
controls for the heat equation and is based on the Fokas method. This is a direct method for …

[PDF][PDF] Long-Range Instability of Linear Evolution PDE on Semi-Bounded Domains via the Fokas Method

A Chatziafratis, L Grafakos, S Kamvissis - Dynamics of PDE, 2024 - users.math.uoc.gr
We study the inhomogeneous Airy partial differential equation (also called Stokes or
linearized Korteweg-de Vries equation with a negative sign) on the half-line with generic …

A note on uniqueness for linear evolution PDEs posed on the quarter-plane

A Chatziafratis, S Kamvissis - arXiv preprint arXiv:2401.08531, 2024 - arxiv.org
In this paper, we announce a rigorous approach to establishing uniqueness results, under
certain conditions, for initial-boundary-value problems for a class of linear evolution partial …

Nonlocal and multipoint boundary value problems for linear evolution equations

B Pelloni, DA Smith - Studies in Applied Mathematics, 2018 - Wiley Online Library
We derive the solution representation for a large class of nonlocal boundary value problems
for linear evolution partial differential equations (PDE) with constant coefficients in one …