Horndeski/Galileon black hole shadows
General Relativity and Quantum Cosmology
2016-10-25 v1
Abstract
We examine observational signatures of the asymptotically de Sitter branch of static spherically symmetric Horndeski/Galileon solutions. Our analysis reveales that possible deviations of the photon sphere size from those of the GR Schwarzshild solution are vanishing compared to the resolution of modern radio-interferometric observations. These deviations are heavily suppressed by the bounds coming from the weak-field observation. We conclude that shadow size would not be a useful characteristic to distinguish the Horndeski/Galileon static spherically symmetric spacetimes in the foreseeable future.
Keywords
Cite
@article{arxiv.1610.07300,
title = {Horndeski/Galileon black hole shadows},
author = {D. A. Tretyakova and T. M. Adyev},
journal= {arXiv preprint arXiv:1610.07300},
year = {2016}
}
Comments
12 pages. arXiv admin note: substantial text overlap with arXiv:1606.08569