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    Limits on Einstein's equivalence principle from the first localized fast radio burst FRB 150418

    240132.pdf (431.8Kb)
    Access Status
    Open access
    Authors
    Tingay, Steven
    Kaplan, D.
    Date
    2016
    Type
    Journal Article
    
    Metadata
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    Citation
    Tingay, S. and Kaplan, D. 2016. Limits on Einstein's equivalence principle from the first localized fast radio burst FRB 150418. Astrophysical Journal Letters. 820 (2): L31.
    Source Title
    Astrophysical Journal Letters
    DOI
    10.3847/2041-8205/820/2/L31
    ISSN
    2041-8205
    School
    Curtin Institute of Radio Astronomy (Physics)
    Remarks

    Copyright © 2016 The American Astronomical Society. All rights reserved.

    URI
    http://hdl.handle.net/20.500.11937/37004
    Collection
    • Curtin Research Publications
    Abstract

    Fast radio bursts (FRBs) have recently been used to place limits on Einstein’s Equivalence Principle via observations of time delays between photons of different radio frequencies by Wei et al. These limits on differential post-Newtonian parameters (Δγ < - 2.52 x 10 -8) are the best yet achieved, but they still rely on uncertain assumptions, namely the relative contributions of dispersion and gravitational delays to the observed time delays and the distances to FRBs. Also, very recently, the first FRB host galaxy has likely been identified, providing the first redshift-based distance estimate to FRB 150418. Moreover, consistency between the ΩIGM estimate from FRB 150418 and ΩIGM, expected from ΛCDM models and WMAP observations, leads one to conclude that the observed time delay for FRB 150418 is highly dominated by dispersion, with any gravitational delays being small contributors. This points to even tighter limits on Δγ. In this paper, the technique of Wei et al. is applied to FRB 150418 to produce a limit of Δγ < 1–2 × 10−9, approximately an order of magnitude better than previous limits and in line with expectations by Wei et al. for what could be achieved if the dispersive delay is separated from other effects. Future substantial improvements in such limits will depend on accurately determining the contribution of individual ionized components to the total observed time delays for FRBs.

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