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Title:
Severe Limits on Variations of the Speed of Light with Frequency
Authors:
Schaefer, Bradley E.
Affiliation:
AA(Physics Department, Yale University, P.O. Box 208121, New Haven, Connecticut 06520-8121)
Publication:
Physical Review Letters, Volume 82, Issue 25, June 21, 1999, pp.4964-4966 (PhRvL Homepage)
Publication Date:
06/1999
Origin:
AIP; APS
DOI:
10.1103/PhysRevLett.82.4964
Bibliographic Code:
1999PhRvL..82.4964S

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+/-30 μs for photons of 30 and 200 keV. The limit on mγ is 4.2×10-44 g for GRB 980703 from radio to gamma ray observations. The limit on EQG is 8.3×1016 GeV for GRB 930131 from 30 keV to 80 MeV photons.
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