Do Photons Experience Changes in Potential Fields?

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DeG
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Are photons effected by traveling through electric or gravitational potential differences? If so, how so?
 
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DeG said:
Are photons effected by traveling through electric or gravitational potential differences? If so, how so?

Photon is not charged. So it is not affected by the electric field.

Photon has energy, so does responds to gravitation potential different. It can gain/loss energy and therefore red/blue shift.
 
Does the electric field component of em waves not interact with electric fields and likewise with the magnetic component? Also, could I get the mathematics behind the blue and/ or red shift of light do to gravitation?