# Testing Einstein’s Equivalence Principle and Its Cosmological Evolution from Quasar Gravitational Redshifts

@article{Mediavilla2021TestingEE,
title={Testing Einstein’s Equivalence Principle and Its Cosmological Evolution from Quasar Gravitational Redshifts},
author={Evencio Mediavilla and J. Jim'enez-Vicente},
journal={The Astrophysical Journal},
year={2021},
volume={914}
}
• Published 1 June 2021
• Physics
• The Astrophysical Journal
We propose and apply a new test of Einstein’s equivalence principle (EEP) based on the gravitational redshift induced by the central supermassive black hole of quasars in the surrounding accretion disk. Specifically, we compare the observed gravitational redshift of the Fe III λ λ 2039-2113 emission line blend in quasars with the predicted values in a wide, uncharted, cosmic territory (0 ≲ z cosm ≲ 3). For the first time we measure, with statistical uncertainties comparable or better than those…
2 Citations
• Physics
The Astrophysical Journal
• 2022
A key observational prediction of Einstein’s Equivalence Principle is that light undergoes redshift when it escapes from a gravitational field. Although astrophysics provides a wide variety of
• Physics
The Astrophysical Journal
• 2022
Under the hypothesis of gravitational redshift induced by a central supermassive black hole, and based on line widths and shifts of redward-shifted Hβ and Fe ii broad emission lines for a sample of

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