25,532 research outputs found
Potential constrains on Lorentz invariance violation from the HAWC TeV gamma-rays
Astrophysical scenarios provide a unique opportunity to test the possible
signatures of Lorentz Invariance Violation (LIV) due to the high energies and
the very long distances they involve. An isotropic correction to the photon
dispersion relation, by hypothetical Lorentz invariance violation, has a
consequence that photons of sufficient energy are unstable and decay very fast.
The High Altitude Water Cherenkov (HAWC) observatory is sensitive to gamma-rays
in the 100 GeV to 100 TeV energy range, making it a very useful tool to study
LIV. In this work we present potential stringent limits for the LIV energy
scale at first and second order correction by the potential observations of
primary very high energy photons in HAWC energy range.Comment: Presented at the 35th International Cosmic Ray Conference (ICRC2017),
Bexco, Busan, Korea. See arXiv:1708.02572 for all HAWC contribution
Sigma theory for Bredon modules
We develop new invariants similar to the Bieri-Strebel-Neumann-Renz
invariants but in the category of Bredon modules (with respect to the class of
the finite subgroups of G). We prove that for virtually soluble groups of type
FP_{\infty} and finite extension of the Thompson group F the new invariants
coincide with the classical ones
Analysis of marketing systems on traditional bananas and plantains in Peru
Poster presented at Tropentag 2011 - Development on the Margin. Bonn (Germany), 3-7 Oct 2011
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