The third wheel: ringdown and lensing of triple systems
Abstract
Triple systems have progressively been recognized as ubiquitous in our universe and provide a good testing ground for wave generation and propagation in nontrivial environments. We study the dynamics of triple systems in a fully nonlinear setting. In particular, we analyze numerical relativity simulations of head-on collisions of black holes in the presence of a companion. We show evidence for Doppler and gravitational redshift in the ringdown, and clear signs of amplification by lensing. In certain cases, we also show the appearance of a second image, with hints of resonant mode excitation. Our results pave the way for the understanding of mergers in the vicinity of massive companions. Even in extreme setups we do not find collapse to black holes from lensed gravitational radiation.
Cite
@article{arxiv.2605.20320,
title = {The third wheel: ringdown and lensing of triple systems},
author = {Vitor Cardoso and Giuseppe Ficarra and Jaime Redondo-Yuste and João Sieiro dos Santos},
journal= {arXiv preprint arXiv:2605.20320},
year = {2026}
}
Comments
19 pages, 10 figures. Comments are welcome