On the existence of meromorphic solutions of the complex Schr\"{o}dinger equation with a q-shift

TL;DR

This paper investigates the existence and properties of meromorphic solutions to a complex Schr"odinger equation with a q-shift, providing conditions for solutions and exploring their forms, including entire solutions and exponential polynomial solutions.

Contribution

It establishes necessary conditions for meromorphic solutions of the q-shift Schr"odinger equation and proves the existence of entire solutions under specific polynomial coefficient conditions.

Findings

Necessary conditions for meromorphic solutions of zero order.

Existence of entire solutions when R reduces to a quadratic polynomial with constant coefficients.

Analysis of the form and number of solutions, including exponential polynomial solutions.

Abstract

In this paper, we study the following complex Schr\"{o}dinger equation with a $q$-difference term: \begin{align}\tag{{\dag}}\label{dagger} f'(z) = a(z)f(qz) + R(z, f(z)), \quad R(z, f(z)) = \frac{P(z, f(z))}{Q(z, f(z))}, \end{align} where $a(z) \not\equiv 0$ is a small meromorphic function with respect to $f(z)$, and all the coefficient functions of $R(z, f(z))$ are also small meromorphic functions with respect to $f(z)$. We assume that $q\in\mathbb{C}\setminus \left \{ 0,-1,1 \right \} $ and that $R(z, f(z))$ is an irreducible rational function in both $f(z)$ and $z$. We obtain some necessary conditions for \eqref{dagger} to have meromorphic solutions of zero order and non-constant entire solutions, respectively. In particular, if $R(z,f(z))$ reduces to a polynomial in $f(z)$ with degree at most 2 and all the coefficients are constant, then under this assumption and without imposing any restrictions on the growth order of $f(z),$ we prove the existence of entire solutions in many cases, study their number, and further investigate the local and global meromorphic solutions to \eqref{dagger}. Additionally, we consider the possible forms of the meromorphic solutions to \eqref{dagger} in certain conditions and examine exponential polynomials as possible solutions of \eqref{dagger}.