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Simplified, that doesn't make sense to me?Where do you get that notion from?

Why is light always a constant 'c'.It's worth thinking of.

Mike - the way gravitational time dilation is calculated at present is that in a region with a low graviational potential time will pass more slowly - we measure this as a ratio of coordinate time (there are differences between this and gravitational field strength which you are relying upon). Coordinate time is the measured time between events for a higher ticking clock observer at an arbitrarily high graviatational potential ie an arbitrarily large distance. By definition light travels at c in this arbitrarily high-ticking region. To postulate a background gravitational potential that is everywhere, needs more theory, testability, and reason than an extrapolation of gravitational time dilation. The reason you need to do more than extrapolate is that time dilation due to gravitational potential goes to a limit of coordinate time and arbitrarily high gravitational potential but not infinite speed of light.

This does however, fit in with quantum mechanics idea of energy of the vacuum.If energy can spontaneously appear from the vacuum it is doing so outside of time. In which case it must be instantaneous. Therefore, it follows that outside of a gravitational field a photon travels instantaneous.