From BTZ Perturbations to Schwarzian Modes: A Geometrical and Perturbative Analysis
High Energy Physics - Theory
2026-04-13 v4 General Relativity and Quantum Cosmology
Abstract
We provide a detailed derivation of the Schwarzian modes in the full geometry of the Ba\~nados-Teitelboim-Zanelli (BTZ) black hole at finite temperature, establishing the precise conditions under which they emerge from the general solution, thereby clarifying the absence of rotational modes in the full geometry. In addition, we demonstrate that the same modes can be recovered through a purely geometric Kerr-Schild construction. This equivalent approach offers a new geometric understanding of the Schwarzian sector and highlights the correspondence between perturbative and pure geometric approaches, additionally it provides a connection with double copy.
Cite
@article{arxiv.2511.07111,
title = {From BTZ Perturbations to Schwarzian Modes: A Geometrical and Perturbative Analysis},
author = {Lucas Acito and Matías N. Sempé},
journal= {arXiv preprint arXiv:2511.07111},
year = {2026}
}