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Robust Limits on Lorentz Violation from Gamma-Ray Bursts | | John Ellis
; Nick E. Mavromatos
; Dimitri V. Nanopoulos
; Alexander S. Sakharov
; Edward K.G. Sarkisyan
; | | Date: |
6 Oct 2005 | | Subject: | astro-ph | | Affiliation: | CERN), Nick E. Mavromatos (King’s Coll., London), Dimitri V. Nanopoulos (Texas A-M & HARC, Woodlands & Athens Academy), Alexander S. Sakharov (CERN & ETHZ), Edward K.G. Sarkisyan (CERN & Univ. Manchester | | Abstract: | We constrain the possibility of a non-trivial refractive index in free space corresponding to an energy-dependent velocity of light: c(E) simeq c_0 (1 - E/M), where M is a mass scale that might represent effect of quantum-gravitational space-time foam, using the arrival times of sharp features observed in the intensities of radiation with different energies from a large sample of gamma-ray bursters (GRBs) with known redshifts. We use wavelet techniques to identify genuine features, which we confirm in simulations with artificial added noise. Using the weighted averages of the time-lags calculated using correlated features in all the GRB light curves, we find a systematic tendency for more energetic photons to arrive earlier. However, there is a very strong correlation between the parameters characterizing an intrinsic time-lag at the source and a distance-dependent propagation effect. Moreover, the significance of the earlier arrival times is less evident for a subsample of more robust spectral structures. Allowing for intrinsic stochastic time-lags in these features, we establish a statistically robust lower limit: M > 0.9x10^{16} GeV on the scale of violation of Lorentz invariance. | | Source: | arXiv, astro-ph/0510172 | | Services: | Forum | Review | PDF | Favorites | |
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