If there was a Universe with nothing but photons, and these photons were all left-circularly polarized, would it stay like this?
(I know this is possible since in a lab you can create a beam of left-circularized light for use with 3D glasses).
But on the other hand we know that massless spin-1 particles have 2 quantum states (which is partly what makes them spin-1 and not spin-0) particles.
So I see an apparent contradiction. In that a masslesss spin-1 particle must come in two states, yet, it seems like it is consistent to have a Universe which only has one of those states.
Where is my mistake in my reasoning?