Vacuum Cherenkov radiation in quantum electrodynamics with high-energy Lorentz violation

Damiano Anselmi and Martina Taiuti
Phys. Rev. D 83, 056010 – Published 9 March 2011

Abstract

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 ΛL. 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 ΛL (with preserved CPT invariance) can be smaller than the Planck scale, actually as small as 10141015GeV. Our model also predicts the Cherenkov radiation of neutral particles.

  • Figure
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  • Received 17 January 2011

DOI:https://doi.org/10.1103/PhysRevD.83.056010

© 2011 American Physical Society

Authors & Affiliations

Damiano Anselmi1,2,* and Martina Taiuti2,3,†

  • 1Institute of High Energy Physics, Chinese Academy of Sciences, 19 (B) Yuquanlu, Shijingshanqu, Beijing 10049, China
  • 2Dipartimento di Fisica “Enrico Fermi”, Università di Pisa, Largo B. Pontecorvo 3, I-56127 Pisa, Italy
  • 3INFN, Sezione di Pisa, Largo B. Pontecorvo 3, I-56127 Pisa, Italy

  • *damiano.anselmi@df.unipi.it
  • martina.taiuti@df.unipi.it

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Vol. 83, Iss. 5 — 1 March 2011

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