Polarization

Description

Polarization[k] = Polarization[k, I] is the head of a polarization momentum with (incoming) momentum k. A slashed polarization vector (e1(k) slash) has to be entered as DiracSlash[Polarization[k]]. The internal representation for a polarization vector e1 corresponding to a boson with four momentum k is: Momentum[ Polarization[ k, I ] ]. With this notation transversality of polarization vectors is provided, i.e. , Pair[ Momentum[k], Momentum[ Polarization[k, I] ] ] yields 0. Polarization[k,-I] denotes the complex conjugate polarization. Polarization is also an option of various functions related to the operator product expansion. The setting 0 denotes the unpolarized and 1 the polarized case.

See also:  PolarizationVector.

Examples

Polarization[k]

Polarization[k] // StandardForm

Polarization[k] // ComplexConjugate

Polarization[k] // ComplexConjugate // StandardForm

DiracSlash[Polarization[k]]

DiracSlash[Polarization[k]] // StandardForm

Pair[ Momentum[k],  Momentum[ Polarization[k,  I] ] ]