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High Energy Astrophysics Tests of Lorentz Invariance and Quantum Gravity ModelsHigh-energy astrophysics observations provide the best possibilities to detect a very small violation of Lorentz invariance such as may be related to the structure of space-time near the Planck scale of approximately 10-35 m. I will discuss here the possible signatures of Lorentz invariance violation (LIV) from observations of the spectra, polarization, and timing of gamma-rays from active galactic nuclei and gamma-ray bursts. Other sensitive tests are provided by observations ofthe spectra of ultrahigh energy cosmic rays and neutrinos. Using the latest data from the Pierre Auger Observatory one can already derive an upper limit of 4.5 x 10(exp -23) to the amount of LIV at a proton Lorentz factor of -2 x 10(exp 11). This result has fundamental implications for quantum gravity models. I will also discuss the possibilities of using more sensitive space based detection techniques to improve searches for LIV in the future.
Document ID
20110015155
Acquisition Source
Goddard Space Flight Center
Document Type
Conference Paper
Authors
Stecker, Floyd W. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Date Acquired
August 25, 2013
Publication Date
September 8, 2011
Subject Category
Astrophysics
Report/Patent Number
GSFC.ABS.4735.2011
Meeting Information
Meeting: Symposium on Particle Astrophysics and Cosmology including Fundamental Interactions
Location: Moorea
Country: French Polynesia
Start Date: September 8, 2011
End Date: September 13, 2011
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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