Coercivity Properties of the Canonical Energy in Double Null Gauge

TL;DR

This paper links the conservation of canonical energy in linearized vacuum Einstein equations to coercivity properties in double null gauge, providing new insights into gravitational perturbations and energy bounds in Schwarzschild and Kerr spacetimes.

Contribution

It establishes a direct correspondence between canonical energy conservation and known conservation laws in double null gauge, enabling coercivity results for gravitational perturbations.

Findings

Proves coercivity of canonical energy in Schwarzschild spacetime.

Shows correspondence between conservation laws and coercivity properties.

Suggests a systematic approach for Kerr spacetime analysis.

Abstract

In this paper, we study the canonical energy associated with solutions to the linearised vacuum Einstein equation on a stationary spacetime. The main result of this paper establishes, in the context of the $4$-dimensional Schwarzschild exterior, a direct correspondence between the conservation law satisfied by the canonical energy and the conservation laws deduced by Holzegel for gravitational perturbations in double null gauge. Since the latter exhibit useful coercivity properties (leading to energy and pointwise boundedness statements) we obtain coercivity results for the canonical energy in the double null gauge as a corollary. More generally, the correspondence suggests a systematic way to uncover coercivity properties in the conservation laws for the canonical energy on Kerr.