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:
- hep-ph/9804448 [hep-ph]
Report number:
- DFUB-98-8,
- UB-ECM-PF-98-10
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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
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