Pretty please could some one explain it to me. I am very confused. the only thing i understand is that it is dimensionless. but what has it to do with 1. value in early epochs (what?) of universe 2. being bigger in different parts of electromagnetic spectrum 3. and what exactly does it describe?
Basically i have no idea at all (an doing basic particle physics/cosmology type ou course but this was in a bit to do with electromagnetic interactions.
Anyone who has a clue and could kinda put it in idiot language tonight it would be appreiciated.