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| Constraints on quantum gravity from fast VHE gamma-ray flares of AGN |
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| content: |
A number of models of quantum gravity violate Lorentz invariance and
predict an energy dependence of the speed of light, leading to a dispersion
of signals at high energies that travel over cosmological distances. Limits
on the dispersion from short-duration substructures observed in soft
gamma-rays emitted by GRBs at cosmological distances have provided
interesting bounds on this violation of Lorentz invariance.
The bright and fast flares observed by the Cherenkov experiment H.E.S.S.
from the blazar PKS 2155-304 during the summer of 2006 provide very tight
constraints,
especially for high-order terms and dispersion relations with an
energy dependence that is steeper than linear.
We present spectral timing analysis from this event, derive limits
on the dispersion and discuss limits on the violation of Lorentz invariance. |
| collaboration: |
HESS |
| Reference: |
Proceedings of the 30th International Cosmic Ray Conference;
Rogelio Caballero, Juan Carlos D'Olivo, Gustavo Medina-Tanco,
Lukas Nellen, Federico A. Sánchez, José F. Valdés-Galicia (eds.);
Universidad Nacional Autónoma de México,
Mexico City, Mexico, 2008;
Vol. 4 (HE part 1), pages 749-752
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| Id: |
942 |
| Place: |
Merida, Mexico
Room: Kabah (Holiday Inn) |
| Starting date: |
| 10-Jul-2007 |
11:42 (Mexico/General) |
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| Duration: |
12' |
| Contribution type: |
Oral |
| Primary Authors: |
Prof. WAGNER, Stefan (LSW) |
| Co-Authors: |
Dr. BENBOW, Wystan (MPIK Heidelberg)
Mr. EMMANOULOPOULOS, Dimitrios (LSW Heidelberg) |
| Presenters: |
Prof. WAGNER, Stefan |
| Material: |
 Paper |
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| Included in session: |
HE 3.3 |
| Included in track: |
HE.3.3 |
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