Document Type

Article

Publication Date

1-1-1999

Abstract

Explosive astrophysical events at high redshift can be used to place severe limits on the fractional variation in the speed of light with frequency (Δc/c), the photon mass (mγ), and the energy scale of quantum gravity (EQG). I find Δc/c<6.3×10-21 based on the simultaneous arrival of a flare in GRB 930229 with a rise time of 220±30μs for photons of 30 and 200 keV. The limit on mγ is 4.2×10-44g for GRB 980703 from radio to gamma ray observations. The limit on EQG is 8.3×1016GeV for GRB 930131 from 30 keV to 80 MeV photons. © 1999 The American Physical Society.

Publication Source (Journal or Book title)

Physical Review Letters

First Page

4964

Last Page

4966

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