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Upper limits on Einstein's weak equivalence principle placed by uncertainties of dispersion measures of fast radio bursts

Authors :
Tetsuya Hashimoto
Tomotsugu Goto
Daryl Joe D. Santos
Simon C.-C. Ho
Tiger Y.-Y. Hsiao
Yi Hang Valerie Wong
Alvina Y. L. On
Seong Jin Kim
Ting-Yi Lu
Ece Kilerci-Eser
Source :
Hashimoto, T, Goto, T, Santos, D J D, Ho, S C-C, Hsiao, T Y-Y, Wong, Y H V, On, A Y L, Kim, S J, Lu, T-Y & Kilerci-Eser, E 2021, ' Upper limits on Einstein's weak equivalence principle placed by uncertainties of dispersion measures of fast radio bursts ', Physical Review D, vol. 104, no. 12, 124026 . https://doi.org/10.1103/PhysRevD.104.124026
Publication Year :
2021
Publisher :
American Physical Society, 2021.

Abstract

Fast radio bursts (FRBs) are astronomical transients with millisecond timescales occurring at cosmological distances. The observed time lag between different energies of each FRB is well described by the inverse-square law of the observed frequency, i.e., dispersion measure. Therefore, FRBs provide one of the ideal laboratories to test Einstein's weak equivalence principle (WEP): the hypothetical time lag between photons with different energies under a gravitational potential. If WEP is violated, such evidence should be exposed within the observational uncertainties of dispersion measures, unless the WEP violation also depends on the inverse-square of the observed frequency. In this work, we constrain the difference of gamma parameters ($\Delta\gamma$) between photons with different energies using the observational uncertainties of FRB dispersion measures, where $\Delta\gamma=0$ for Einstein's general relativity. Adopting the averaged 'Shapiro time delay' for cosmological sources, FRB 121002 at $z=1.6\pm0.3$ and FRB 180817.J1533+42 at $z=1.0\pm0.2$ place the most stringent constraints of $\log\Delta\gamma<br />Comment: Accepted for publication in Physical Review D. A summary video is available at https://youtu.be/Rt7tXN02wpQ

Details

Language :
English
Database :
OpenAIRE
Journal :
Hashimoto, T, Goto, T, Santos, D J D, Ho, S C-C, Hsiao, T Y-Y, Wong, Y H V, On, A Y L, Kim, S J, Lu, T-Y & Kilerci-Eser, E 2021, ' Upper limits on Einstein's weak equivalence principle placed by uncertainties of dispersion measures of fast radio bursts ', Physical Review D, vol. 104, no. 12, 124026 . https://doi.org/10.1103/PhysRevD.104.124026
Accession number :
edsair.doi.dedup.....a1109c06d97d5254d2b9477043e0512b
Full Text :
https://doi.org/10.1103/PhysRevD.104.124026