Patterns of Lorentz symmetry breaking in QED by CPT odd interaction

Apr, 1998
9 pages
Published in:
  • Phys.Lett.B 435 (1998) 449-452
e-Print:
Report number:
  • DFUB-98-8,
  • UB-ECM-PF-98-10

Citations per year

199820052012201920240246810
Abstract:
A tiny Lorentz symmetry breaking can be mediated in Electrodynamics by means of the Chern-Simons (CS) interaction polarized along a constant CS vector. Its presence makes the vacuum optically active that has been recently estimated from astrophysical data. We examine two possibilities for the CS vector to be time-like or space-like, under the assumption that it originates from v.e.v. of some pseudoscalar matter. It is shown that: a) a time-like CS vector makes the vacuum unstable under pairs creation of tachyonic photon modes with the finite vacuum decay rate, i.e. it is unlikely realized at macroscopic time scales; b) on the contrary, the space-like CS vector does not yield any tachyonic modes and, moreover, if its dynamical counterpart is substantially described by a scale invariant interaction, then the QED radiation effects induce the dynamical breaking of Lorentz symmetry, i.e. the occurrence of space-like CS vector appears to be rather natural.
Note:
  • 9 pages, LaTeX, version to appear in Phys.Lett.B Report-no: DFUB-98/8; UB-ECM-PF-98/10
  • 11.30.Qc
  • 14.80.Mz
  • quantum electrodynamics
  • violation: Lorentz
  • Chern-Simons term
  • vacuum state: stability
  • photon: mass
  • violation: CPT
  • photon: tachyon
  • photon: dispersion relation