Authors: Calin Vasilescu
Here I study the behaviour of internal orbital angular momentum OAM light beams in a gravitational field. According to this study, such a beam will behave like a particle with rest mass, therefore the wavefront will slow down if the beam is pointed against the gravitational field and it will accelerate if pointed in the same direction as the gravitational field. This study is conducted in a classical context, intentionally ignoring Lorentz factors. However, the relativistic effects associated with these helical structures will emerge naturally. The paper will focus on a single relativistic phenomenon – naturally occurring velocity limitation of a spin ½ particle concept which poses a rest mass. However, this rest mass is also a redefined concept. It is interesting that if a beam is pointed against a gravitational field, the step length of the helical structure reduces which acts on increasing the detected frequency of the incoming beam (considering a stationary detector above the source and the gravitational filed direction pointing downward), but since the speed of the wavefront reduces, it acts as a reducing factor for the frequency that the detector will read. In other words, although the wavelength of the beam reduces as the wave-front advances, the speed of the wavefront reduces as well, resulting in a decreasing frequency. When the front-wave velocity tends to zero, this frequency tends to a positive number. It is clear that if the wavefront speed reduces under a gravitational field, it will eventually stop and reverse the direction, falling towards the source of the field. This behaviour is similar to a particle with rest mass. However, if photons don't have mass, then, my suggestion is that particles are helical structures that have similar construction to OAM |m| = 1 and therefore, we could say they don't have mass either.
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