http://arxiv.org/abs/1912.12629
We study the equivalence principle, regarded as the cornerstone of General Relativity, by analyzing the deformation observable of black hole shadows. Such deformation can arise from new physics and may be expressed as a phenomenological violation of the equivalence principle. Specifically, we assume that there is an additional background vector field acting on the photons. This vector field changes the way the system depends on initial conditions, and can produce different sizes of the black hole shadow at different wave bands. This can be tested by future multi-band observations. Adopting a specific form of the vector field we obtain constraints on model parameters from Event Horizon Telescope observations and measurements of gas/stellar orbits.
C. Li, S. Yan, L. Xue, et. al.
Wed, 1 Jan 20
79/88
Comments: 10 pages, 3 figures
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