On one real basis for $L^2(Q_p)$

TL;DR

This paper constructs new eigenfunction bases for $L^2$ spaces over $p$-adic fields, linking them to $p$-adic wavelets and applying these to solve pseudo-differential equations with initial conditions on compact sets.

Contribution

It introduces novel eigenfunction bases for $L^2$ spaces over $p$-adic fields and relates them to existing $p$-adic wavelet bases, enabling new solutions to pseudo-differential equations.

Findings

New bases of eigenfunctions for $L^2(B_r)$ and $L^2(Q_p)$ are constructed.

A relation between these bases and $p$-adic wavelet bases is established.

Application to solving pseudo-differential equations with initial conditions on compact sets.

Abstract

We construct new bases of real functions from $L^{2}\left(B_{r}\right)$ and from $L^{2}\left(\mathbb{Q}_{p}\right)$. These functions are eigenfunctions of the $p$-adic pseudo-differential Vladimirov operator, which is defined on a compact set $B_{r}\subset\mathbb{Q}_{p}$ of the field of $p$-adic numbers $\mathbb{Q}_{p}$ or, respectively, on the entire field $\mathbb{Q}_{p}$. A relation between the basis of functions from $L^{2}\left(\mathbb{Q}_{p}\right)$ and the basis of $p$-adic wavelets from $L^{2}\left(\mathbb{Q}_{p}\right)$ is found. As an application, we consider the solution of the Cauchy problem with the initial condition on a compact set for a pseudo-differential equation with a general pseudo-differential operator, which is diagonal in the basis constructed.