Testing the Einstein's equivalence principle with polarized gamma-ray bursts

Abstract

The Einstein's equivalence principle can be tested by using parameterized post-Newtonian parameters, of which the parameter $\gamma$ has been constrained by comparing the arrival times of photons with different energies. It has been constrained by a variety of astronomical transient events, such as gamma-ray bursts (GRBs), fast radio bursts as well as pulses of pulsars, with the most stringent constraint of $\Delta \gamma \lesssim 10^{-15}$. In this letter, we consider the arrival times of lights with different circular polarization. For a linearly polarized light, it is the combination of two circularly polarized lights. If the arrival time difference between the two circularly polarized lights is too large, their combination may lose the linear polarization. We constrain the value of $\Delta {\gamma }_{\mathrm{p}}<1.6\times 10^{-27}$ by the measurement of the polarization of GRB 110721A, which is the most stringent constraint ever achieved.

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Cited by in corpus (12)

• Multimessenger tests of the weak equivalence principle from GW170817 and its electromagnetic counterparts
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• Shortcomings of Shapiro delay-based tests of the equivalence principle on cosmological scales
• A New Method to Test the Einstein's Weak Equivalence Principle
• Testing Weak Equivalence Principle with Strongly Lensed Cosmic Transients
• Precision Test of the Weak Equivalence Principle from Gamma-Ray Burst Polarization
• Cosmic Transients, Einstein's Equivalence Principle and Dark Matter Halos
• Consistent equivalence principle tests with fast radio bursts
• Gamma-Ray Polarimetry
• Constraining Einstein's Equivalence Principle With Multi-Wavelength Observations of Polarized Blazars
• Constraining Einstein's Equivalence Principle With Multi-Wavelength Polarized astrophysical Sources
• Testing Weak Equivalence Principle with IceCube Event and Blazar