GW: "photon" is a gauge boson. Carrier of emr. Gravity and the weak force came out first. They think, although they don't know for sure, that when the weak force dropped out of the initial "soup" inflation started. > > "gravity", if in the standard model, would be a graviton. The weak force is carried by the W-Z particles. If use as the electro-week force, than The combo of these forces is on the way to unification. Very high temps. But maybe they are the same "particle" just seen differently. > dwh is fine with your take. end it there or we have to explore what you mean in > detail.- We agree: I use this blog to look at the 'particles':-http://profmattstrassler.com/articles-and-posts/particle-physics-basics/the-known-apparently-elementary-particles/-All I showed you was a period of photon formation in the Wiki page