Definition of "helicity" []

• The quality of being helical. (noun)
• The quantized spin component of a moving particle (noun)

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• "Also gravity waves have to directions of polarization, instead of one for EM waves, which is tied to something called helicity which is 2."
• "In section 33.8, Penrose brings in "Massless fields of mixed helicity-such as a plane-polarized photon, which is the sum of a right-handed and left-handed part"."
• "The photon has a helicity or spin, momentum and energy."