Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2011-01-11
Phys.Rev.D83:056010,2011
Physics
High Energy Physics
High Energy Physics - Phenomenology
27 pages, 2 figures; v2: typos corrected, more references, some more comments - PRD
Scientific paper
10.1103/PhysRevD.83.056010
We study phenomena predicted by a renormalizable, CPT invariant extension of the Standard Model that contains higher-dimensional operators and violates Lorentz symmetry explicitly at energies greater than some scale Lambda_{L}. In particular, we consider the Cherenkov radiation in vacuo. In a rather general class of dispersion relations, there exists an energy threshold above which radiation is emitted. The threshold is enhanced in composite particles by a sort of kinematic screening mechanism. We study the energy loss and compare the predictions of our model with known experimental bounds on Lorentz violating parameters and observations of ultrahigh-energy cosmic rays. We argue that the scale of Lorentz violation Lambda_{L} (with preserved CPT invariance) can be smaller than the Planck scale, actually as small as 10^{14}-10^{15} GeV. Our model also predicts the Cherenkov radiation of neutral particles.
Anselmi Damiano
Taiuti Martina
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