Study of Lorentz violation in INTEGRAL gammaray bursts
Abstract
We search for possible time lags caused by quantum gravitational effects using gammaray bursts (GRBs) detected by INTEGRAL. The advantage of this satellite is that we have at our disposal the energy and arrival time of every detected single photon, which enhances the precision of the time resolution. We present a new method for seeking time lags in unbinned data using a maximum likelihood method and support our conclusions with Monte Carlo simulations. The analysis establishes a conservative lower bound on the Lorentz invariance violation scale, which is several orders of magnitude below the Planck mass, whose value may however increase if better statistics of GRBs were available. Furthermore, we disagree with previous studies in which a nonmonotonic function of the redshift was used to perform a linear fit.
 Publication:

General Relativity and Gravitation
 Pub Date:
 August 2008
 DOI:
 10.1007/s1071400705806
 arXiv:
 arXiv:0706.4039
 Bibcode:
 2008GReGr..40.1731L
 Keywords:

 Lorentz violation;
 Quantum gravity;
 Gammaray bursts;
 General Relativity and Quantum Cosmology;
 Astrophysics;
 High Energy Physics  Theory
 EPrint:
 14 pages, 4 figures