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Title: Exploring Quantum Gravity with Very-High-Energy Gamma-Ray Instruments - Prospects and Limitations

Abstract

Some models for quantum gravity (QG) violate Lorentz invariance and predict an energy dependence of the speed of light, leading to a dispersion of high-energy gamma-ray signals that travel over cosmological distances. Limits on the dispersion from short-duration substructures observed in gamma-rays emitted by gamma-ray bursts (GRBs) at cosmological distances have provided interesting bounds on Lorentz invariance violation (LIV). Recent observations of unprecedentedly fast flares in the very-high energy gamma-ray emission of the active galactic nuclei (AGNs) Mkn 501 in 2005 and PKS 2155-304 in 2006 resulted in the most constraining limits on LIV from light-travel observations, approaching the Planck mass scale, at which QG effects are assumed to become important. I review the current status of LIV searches using GRBs and AGN flare events, and discuss limitations of light-travel time analyses and prospects for future instruments in the gamma-ray domain.

Authors:
 [1]
  1. Max-Planck-Institut fuer Physik, D-80805 Muenchen (Germany)
Publication Date:
OSTI Identifier:
21293537
Resource Type:
Journal Article
Journal Name:
AIP Conference Proceedings
Additional Journal Information:
Journal Volume: 1112; Journal Issue: 1; Conference: 6. workshop on high energy gamma-ray experiments: Bridging the gap between GeV and TeV, Abano Terme (Italy), 8-10 Oct 2008; Other Information: DOI: 10.1063/1.3125781; (c) 2009 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0094-243X
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; 72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; COSMIC GAMMA BURSTS; COSMIC PHOTONS; COSMOLOGY; DISTANCE; ENERGY DEPENDENCE; GALAXY NUCLEI; GAMMA ASTRONOMY; GAMMA DETECTION; GAMMA RADIATION; LORENTZ INVARIANCE; QUANTUM GRAVITY; TELESCOPE COUNTERS; VISIBLE RADIATION

Citation Formats

Wagner, Robert. Exploring Quantum Gravity with Very-High-Energy Gamma-Ray Instruments - Prospects and Limitations. United States: N. p., 2009. Web. doi:10.1063/1.3125781.
Wagner, Robert. Exploring Quantum Gravity with Very-High-Energy Gamma-Ray Instruments - Prospects and Limitations. United States. doi:10.1063/1.3125781.
Wagner, Robert. Wed . "Exploring Quantum Gravity with Very-High-Energy Gamma-Ray Instruments - Prospects and Limitations". United States. doi:10.1063/1.3125781.
@article{osti_21293537,
title = {Exploring Quantum Gravity with Very-High-Energy Gamma-Ray Instruments - Prospects and Limitations},
author = {Wagner, Robert},
abstractNote = {Some models for quantum gravity (QG) violate Lorentz invariance and predict an energy dependence of the speed of light, leading to a dispersion of high-energy gamma-ray signals that travel over cosmological distances. Limits on the dispersion from short-duration substructures observed in gamma-rays emitted by gamma-ray bursts (GRBs) at cosmological distances have provided interesting bounds on Lorentz invariance violation (LIV). Recent observations of unprecedentedly fast flares in the very-high energy gamma-ray emission of the active galactic nuclei (AGNs) Mkn 501 in 2005 and PKS 2155-304 in 2006 resulted in the most constraining limits on LIV from light-travel observations, approaching the Planck mass scale, at which QG effects are assumed to become important. I review the current status of LIV searches using GRBs and AGN flare events, and discuss limitations of light-travel time analyses and prospects for future instruments in the gamma-ray domain.},
doi = {10.1063/1.3125781},
journal = {AIP Conference Proceedings},
issn = {0094-243X},
number = 1,
volume = 1112,
place = {United States},
year = {2009},
month = {4}
}