Abstract
Violations of both the weak equivalence principle (WEP) and Lorentz invariance can produce vacuum birefringence, which leads to an energy-dependent rotation of the polarization vector of linearly polarized emission from a given astrophysical source. However, the search for the birefringent effect has been hindered by our ignorance concerning the intrinsic polarization angle in different energy bands. Considering the contributions to the observed linear polarization angle from both the intrinsic polarization angle and the rotation angles induced by violations of the WEP and Lorentz invariance, and assuming the intrinsic polarization angle is an unknown constant, we simultaneously obtain robust bounds on possible deviations from the WEP and Lorentz invariance, by directly fitting the multiwavelength polarimetric data of the optical afterglows of gamma-ray burst (GRB) 020813 and GRB 021004. Here, we show that at the \(3\sigma \) confidence level, the difference of the parameterized post-Newtonian parameter \(\gamma \) values characterizing the departure from the WEP is constrained to be \(\varDelta \gamma =\left( -4.5^{+10.0}_{-16.0}\right) \times 10^{-24}\) and the birefringent parameter \(\eta \) quantifying the broken degree of Lorentz invariance is limited to be \(\eta =\left( 6.5^{+15.0}_{-14.0}\right) \times 10^{-7}\). These are the first simultaneous verifications of the WEP and Lorentz invariance in the photon sector. More stringent limits can be expected as the analysis presented here is applied to future multiwavelength polarization observations in the prompt gamma-ray emission of GRBs.
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Notes
Although the potential model of the Milky Way is still not well known, Ref. [3] examined two popular potential models (i.e., the Keplerian potential and the isothermal potential) and suggested that the adoption of a different model for \(U_\mathrm{MW}(r)\) has only a minimal influence on the WEP tests.
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Acknowledgements
This work is partially supported by the National Natural Science Foundation of China (grant Nos. 11673068, 11725314, and U1831122), the Youth Innovation Promotion Association (2017366), the Key Research Program of Frontier Sciences (grant Nos. QYZDB-SSW-SYS005 and ZDBS-LY-7014), and the Strategic Priority Research Program “Multi-waveband gravitational wave universe” (grant No. XDB23000000) of Chinese Academy of Sciences.
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Wei, JJ., Wu, XF. Testing the weak equivalence principle and Lorentz invariance with multiwavelength polarization observations of GRB optical afterglows. Eur. Phys. J. Plus 135, 527 (2020). https://doi.org/10.1140/epjp/s13360-020-00554-x
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DOI: https://doi.org/10.1140/epjp/s13360-020-00554-x