It's what the standard model teaches.
Is light actually a massless traveling particle? Experiments show contradicting possibilities.
Concerning the double slit experiment: The quantum fields must be responsible because electrons sent through two negatively ionized slits in a vacuum one at a time every 60 seconds for a month accumulate as a sum into the exact same interference pattern on the screen which means it cannot be interacting waves of particles forming the pattern.
I have been told things that make no sense concerning electromagnetism.
If light is a massless particle, then it is the only particle that we know of that has zero mass. Somehow a massless light particle can still retain momentum even though momentum is dependent on mass because mass has inertia which propagates momentum. P=mv. I don't know what your definition of momentum is, but to me if an object has momentum, it must have mass with inertia otherwise it wouldn't retain a given movement. Or if light is actually an electromagnetic wave, then it wouldn't have mass with inertia or momentum but rather would be a wave that attenuates through an EM field. If light is an electromagnetic wave moving through an electromagnetic field, then it wouldn't have mass and it wouldn't have momentum either because the field is already there and the wave is only changing the field flux where it already is.
If you dare, read this entire physics article about what you were never taught. You may attempt to write me a better explanation. I've never heard of one.
Science is about asking questions over phenomena in order to understand them which doesn’t begin without speculation. There is a type of speculation that is ordered and structured into a network of comparisons that predicts unknowns with the known. The theory must come first in order to find the variables. An accurate mathematical function cannot be written without knowing and understanding the relationship between the variables in the system that you are trying to describe.