Horndeski/Galileon black hole shadows

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.

arXiv comment12 pages. arXiv admin note: substantial text overlap with arXiv:1606.08569

Cited by in corpus (5)

• Black hole shadow in an asymptotically-flat, stationary, and axisymmetric spacetime: The Kerr-Newman and rotating regular black holes
• Shadows of Einstein-dilaton-Gauss-Bonnet black holes
• Quantum corrections to the generalized Proca theory via a matter field
• Neutrino pair annihilation above black-hole accretion disks in modified gravity
• Visible shapes of black holes M87* and SgrA*