[samcottle (OP)]

Ok, so my idea is as follow: what if the photon has mass, and these massive photons can form classical superpositions with one another in the recesses of intergalactic space and after a certain point these superpositions break leading to the expansion of the space in between galaxies. From the current ΛCDM model of cosmology I can't see how the cosmological constant by itself can lead to the accelerating expansion of the universe. Other have also suggested that the idea of photons having mass may explain dark energy (as in real scientists), I was just hoping to get a discussion going on here.

Also I know that current theories state that giving the photon mass would break gauge invariance, but a man called Stueckelberg managed to renormalise QED with a mass term for the photon, so I think it may well be possible.