Gauge-invariant perturbation theory on the Schwarzschild background spacetime Part II: -- Even-mode perturbations

TL;DR

This paper develops a gauge-invariant perturbation theory for even-mode perturbations on Schwarzschild spacetime, explicitly solving for $l=0,1$ modes and confirming the physical reasonableness of the approach.

Contribution

It provides explicit solutions for $l=0,1$ mode perturbations in gauge-invariant form, extending previous work and confirming the physical validity of the method.

Findings

Explicit $l=0,1$ mode solutions derived

Solutions include Schwarzschild mass and Kerr parameter perturbations

Method confirmed to be physically reasonable

Abstract

This is the Part II paper of our series of papers on a gauge-invariant perturbation theory on the Schwarzschild background spacetime. After reviewing our general framework of the gauge-invariant perturbation theory and the proposal on the gauge-invariant treatments for $l=0,1$ mode perturbations on the Schwarzschild background spacetime in the Part I paper [K.~Nakamura, arXiv:2110.13508 [gr-qc]], we examine the linearized Einstein equations for even-mode perturbations. We discuss the strategy to solve the linearized Einstein equations for these even-mode perturbations including $l=0,1$ modes. Furthermore, we explicitly derive the $l=0,1$ mode solutions to the linearized Einstein equations in both the vacuum and the non-vacuum cases. We show that the solutions for $l=0$ mode perturbations includes the additional Schwarzschild mass parameter perturbation, which is physically reasonable. Then, we conclude that our proposal of the resolution of the $l=0,1$-mode problem is physically reasonable due to the realization of the additional Schwarzschild mass parameter perturbation and the Kerr parameter perturbation in the Part I paper.