# Testing the equivalence principle via the shadow of black holes

@article{Li2019TestingTE, title={Testing the equivalence principle via the shadow of black holes}, author={Chunlong Li and Sheng-Feng Yan and Lingqin Xue and Xin Ren and Yifu Cai and Damien A. Easson and Yefei Yuan and Hongsheng Zhao}, journal={arXiv: Cosmology and Nongalactic Astrophysics}, year={2019} }

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… CONTINUE READING

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