This seems absurd as the speed of photon is constant. And according to NP-Tetrad 3 base-null vectors of photons are considered in the metric space. Therefore, if in the region of magnetorotational instability, a photon curves its path either in unison or not in spin direction of the black hole, experiences change in velocity called acceleration? This is also a question of comoving photons with ions.
There's no meaningful difference between ``acceleration'' and ``deceleration''. In a curved spacetime the speed of a photon isn't constant, incidentally, precisely due to the property that spacetime is curved.
Our universe is a most complete entity that it follows it journey.
Article The formation of Quantum Sun
sun is creating photon and space is transferring the photon. Not is mystery about it.
Our dear Einstein is wrong with all his theories.
most regards
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