So is this a proof of the photons 'travel'?

As they need a 'speed' to have a momentum.

And how about their energy?

They have a electromagnetic energy that influences matter, but not other photons if I understands it right?

Either they travel and then the momentum is a product of their travel, which then seems to say that they should have one 'shape' and not exist in 'many paths' where we count on probability to say whether a photon might have passed us or not.

Or they don't travel and 'many paths' is a reasonable idea, which then leaves momentum to become something truly strange when it comes to photons.

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Why I say that you can't have both is due to that if both exist. 'probability of many simultaneous paths' and momentum, then it seems as those not realized paths also should contain a momentum, which then should be testable by f ex. a solar-sail or something similar. It should also mean that there is a continuous 'push' everywhere if so?

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Sorry wrote this rather late, but it still makes sense, to me :)

You can look at 'many paths' two ways, as a mathematical tool describing probabilities where the solution will be the actual path, or as a straight proposal which is true for all possible paths.

From the observers perspective the first may seem to make the most sense but as I understands it it doesn't make the same sense from the photons perspective.

http://www.sporys.info/PhysicsTheMysteryoftheTwoSlotExperiment.htmAnd that one is confusing to me.

If one assume that a photon exist without 'matter', that is being 'mass less', then the momentum it has should, if it is what we call a 'force', need a 'source'.

In the photons case that 'source' doesn't have much to offer, its intrinsic 'energy' or/and speed. When it comes to matter you have both mass and speed, and both are easily proof able.

But to have a 'speed' normally is to have a path, and we have clear problems showing that path.

And if we can't prove the photons path what have we left? It's intrinsic 'energy' perhaps.

But that 'energy' seems very selective, normally I would expect electromagnetic energy to influence other electromagnetic energy but photons doesn't influence each other although they transmit it?