Measuring the Scale of Quantum Gravity with MAGIC

Details Measuring the Scale of Quantum Gravity with MAGIC Measuring the Scale of Quantum Gravity with MAGIC

Jul 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003icrc....3.1669l&link_type=abstract

Proceedings of the 28th International Cosmic Ray Conference. July 31-August 7, 2003. Trukuba, Japan. Under the auspices of the I

Physics

Scientific paper

Any quantum theory of gravitation leads unavoidably to quantum fluctuations in the gravitational vacuum. In this scenario, an energy-dep endent propagation speed for electromagnetic waves emerges. Therefore gammas of different energies being emitted simultaneously by an extragalactic source should reach the human observatories at different times. Despite the propagation speed correction should be very small, the time delay might become measurable for gamma rays traversing cosmological distances. Active Galaxy Nuclei have shown to be sources with a fast and intense variability at TeV energies which should allow to use them as probes to search for Quantum Gravity effects. The first generation of ground based Cherenkov telescopes already placed some limits on the effective scale of Quantum Gravity using the data from a single Mkn 421 flare. The new generation of IACTs expects to improve it. They should see many more AGNs and they also expect to see other extragalactic sources with high variability at the GeV-TeV range, such as Gamma Ray Burst. Considering the characteristic time scales of flaring AGN and GRB at all redshifts, the range of the effective Quantum Gravity scale accessible to MAGIC has been studied using Monte Carlo simulations.

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