Have there been any theories in recent decades that suggest one? Or more? I know it may seem unnecessary or even frivolous, but theories beyond the standard model are, after all, grappling with issues like how the entire universe and its four forces came to exist. Has anyone postulated a fifth force that would have "cooled" away from the TOE force (somehow leading to the big bang), which then cooled into gravity and the GUT force, which then cooled into the strong force and the electroweak, which then cooled into the weak and the electromagnetic... For that matter, has anyone suggested that the electromagnetic would eventually cool into two separate forces? What do you think? Please forgive me, if my layman's understanding seems way off.