Precision test of the weak equivalence principle from gamma-ray burst polarization
Wei, Jun-Jie1,2; Wu, Xue-Feng1
Source PublicationPHYSICAL REVIEW D
Corresponding AuthorWei, Jun-Jie( ; Wu, Xue-Feng(
AbstractIf the weak equivalence principle (WEP) is broken, the measured values of the parametrized post-Newtonian parameter. from photons with left- and right-handed circular polarizations should differ slightly, leading to the arrival-time difference of these two circular components. Thus, the polarization vector of a linearly polarized light may rotate during the propagation. The rotation angle of the polarization vector depends on both the photon energy and the distance of the source. It is believed that if the rotation angle differs by more than pi/2 over an energy range, then the net polarization of the signal would be significantly suppressed and could not be as high as the observed level. Thus, the detection of highly polarized photons implies that the relative rotation angle (Delta Theta) should not be too large. In this paper, we give a detailed calculation on the evolution of gamma-ray burst (GRB) polarization arising from a possible violation of the WEP, and we find that more than 60% of the initial polarization degree can be conserved even Delta Theta is larger than pi/2. In addition, to tightly constrain the WEP violation, GRBs with harder spectra and polarization observations in a wider energy range seem to be favored. Applying our formulas to the measurements of linear polarization from GRB 110721A and GRB 061122, we obtain strict limits on the differences of the gamma values as low as Delta gamma < 1.3 x 10(-33) and Delta gamma < 0.8 x 10(-33). These provide the most stringent limits to date on a deviation from the WEP, improving at least 6 orders of magnitude over previous bounds.
Indexed BySCI
WOS Research AreaAstronomy & Astrophysics ; Physics
WOS SubjectAstronomy & Astrophysics ; Physics, Particles & Fields
WOS IDWOS:000469024800001
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Cited Times:2[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Corresponding AuthorWei, Jun-Jie; Wu, Xue-Feng
Affiliation1.Chinese Acad Sci, Purple Mt Observ, Nanjing 210034, Jiangsu, Peoples R China
2.Guangxi Univ, Guangxi Key Lab Relativist Astrophys, Nanning 530004, Peoples R China
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GB/T 7714
Wei, Jun-Jie,Wu, Xue-Feng. Precision test of the weak equivalence principle from gamma-ray burst polarization[J]. PHYSICAL REVIEW D,2019,99(10):6.
APA Wei, Jun-Jie,&Wu, Xue-Feng.(2019).Precision test of the weak equivalence principle from gamma-ray burst polarization.PHYSICAL REVIEW D,99(10),6.
MLA Wei, Jun-Jie,et al."Precision test of the weak equivalence principle from gamma-ray burst polarization".PHYSICAL REVIEW D 99.10(2019):6.
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