Asymptotics for Null-timelike Boundary Problems for General Linear Wave Equations

TL;DR

This paper analyzes the behavior of solutions to the linear wave equation in asymptotically flat spacetimes with null-timelike boundary conditions, deriving estimates and asymptotic expansions relevant for understanding wave propagation at infinity.

Contribution

It provides new $H^{p}$-estimates and asymptotic expansions for solutions of the wave equation with null-timelike boundary conditions in asymptotically flat Lorentzian manifolds.

Findings

Derived spacetime $H^{p}$-estimates for $ru$

Established asymptotic expansion of $ru$ as $r o fty$

Analyzed wave behavior in Bondi-Sachs coordinates

Abstract

We study the linear wave equation $\Box_{g}u=0$ in Bondi-Sachs coordinates, for an asymptotically flat Lorentz metric $g$. We consider the null-timelike boundary problem, where an initial value is given on the null surface $\tau=0$ and a boundary value on the timelike surface $r=r_{0}$. We obtain spacetime $H^{p}$-estimates of $ru$ for $r>r_0$ and derive an asymptotic exapnsion of $ru$ in terms of ${1}/{r}$ as $r\to\infty$.