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Astrophysical Limits on Lorentz Violation for Pions
Brett Altschul
Pions, like nucleons, are composed primarily of up and down quarks and gluons. Constraints on spin-independent Lorentz violation in the proton, neutron, and pion sectors translate…
Astrophysical Bounds on the Photon Charge and Magnetic Moment
Brett Altschul
If the photon possessed an electric charge or a magnetic moment, light waves propagating through magnetic fields would acquire new quantum mechanical phases. For a charged photon,…
Finite Duration and Energy Effects in Lorentz-Violating Vacuum Cerenkov Radiation
Brett Altschul
Vacuum Cerenkov radiation is possible in certain Lorentz-violating quantum field theories, when very energetic charges move faster than the phase speed of light. In the presence of…
Bound on the Photon Charge from the Phase Coherence of Extragalactic Radiation
Brett Altschul
If the photon possessed a nonzero charge, then electromagnetic waves traveling along different paths would acquire Aharonov-Bohm phase differences. The fact that such an effect has…
Cerenkov Radiation in a Lorentz-Violating and Birefringent Vacuum
Brett Altschul
We calculate the emission spectrum for vacuum Cerenkov radiation in Lorentz-violating extensions of electrodynamics. We develop an approach that works equally well if the presence…