Comment on "Noncommutativity as a Possible Origin of the Ultrahigh-energy Cosmic Ray and the TeV Photon Paradoxes"

Abstract

A Lorentz-noninvariant modification of the kinematic dispersion law was proposed in [hep-th/0211237], claimed to be derivable from from q-deformed noncommutative theory, and argued to evade ultrahigh energy threshold anomalies (trans-GKZ-cutoff cosmic rays and TeV-photons) by raising the respective thresholds. It is pointed out that such dispersion laws do not follow from deformed oscillator systems, and the proposed dispersion law is invalidated by tachyonic propagation, as well as photon instability, in addition to the process considered.

arXiv commentLaTex2e, 4 pages, further refs added

References in corpus (5)

• Invariance Violation Extends the Cosmic Ray Horizon ?
• An infrared background--TeV gamma-ray crisis?
• Has the GZK suppression been discovered?
• Thermodynamic q-Distributions That Aren't
• Noncommutativity as a Possible Origin of the Ultrahigh Energy Cosmic Ray and the TeV-photon Paradoxes

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• Scattering in Noncommutative Quantum Mechanics
• Noncommutative Decrumpling Inflation and Running of the Spectral Index
• Deriving Spin within a discrete-time theory