Lorentz-symmetry violating decays in a medium
arXiv:0712.4345 · doi:10.1103/PhysRevD.77.113001
Abstract
Various decay processes, such as the decay of a spin-1 particle into two photons or the gravitational decay of a spin-1/2 fermion, are forbidden in the vacuum by a combination of requirements, including angular momentum conservation, Lorentz invariance and gauge invariance. We show that such processes can occur in a medium, such as a thermal background of particles, even if it is homogeneous and isotropic. We carry out a model-independent analysis of the vertex function for such processes in terms of a set of form factors, and show that the amplitude can be non-zero while remaining consistent with the symmetry principles mentioned above. The results simulate Lorentz symmetry violating effects, although in this case they arise from completely Lorentz-invariant physics.
16 pages, Latex, no figures
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- Can Gravity Distinguish between Dirac and Majorana Neutrinos?
- Angular momentum non-conserving decays in isotropic media
- The electric charge and magnetic moment of neutral fundamental particles
- Radiative decay of a scalar in a medium
- Neutrino gravitational decay in a medium