What will be happen if the particle – quantum of light – changes its constant and straight movement in the vacuum.
Lets look at what you might mean by a quantum of light (photon?) changing its constant and straight movement in the vacuum.
Presumably the photon is travelling in a straight line through spacetime. Any change in direction will be caused by a distortion of spacetime. The photon will then be following a geodesic, which is defined as a straight line through curved spacetime. It is still going straight, so is there any real change of direction?
The photon is travelling at “c” in a vacuum. Any apparent change of speed will be in the F of R of the observer. The photon cannot be said to have an inertial frame, nor can it change its speed relative to itself. Can it be said to have changed speed?
