Lorentz gamma factor from vacuum to medium and Minkowski momentum of a photon

Dipok Saikia
Lorentz gamma factor is derived for a photon when it moves from vacuum to a dielectric medium of refractive index μ. This gamma factor can completely explain the increase of photon momentum (Minkowski momentum) in a medium. Covariance problem is resolved without violating energy conservation law and Lorentz invariance.

DOI