Question from John:
Universe had a beginning, “proved” by second law of thermodynamics.
Dear Sir, I understand that an argument used by creationists, in favour of a Universe that had a beginning, is that the second law of thermodynamics requires that it will inevitably wind down. In essence, the claim is that the universe can not have been infinite into the past as it would have inevitably already run down. The fact of a purported finite amount of usable energy therefore implies that the universe MUST have had a beginning or else we would not be here now to discuss this. Is there a scientific rebuttal to this claim please?
Answer by SmartLX:
There are two principal possibilities which address the idea of an infinite universe having run down by now, both of which are centered around the concept of renewal.
1. The universe periodically contracts in a Big Crunch before a new Big Bang. This drags together not only all the matter in the universe but all the space and time as well. All the unusable energy lost to the edges of the universe is brought back to the singularity and can be useful once again.
2. The matter and energy in the hypothetical (but currently quite likely-looking) multiverse is infinite. When one universe runs down, countless others are still going and more universes spontaneously start up all the time. No laws of physics are broken by this sudden emergence if the amount of anti-matter that emerges is equal to the amount of matter, because matter and energy are conserved in an equation akin to 0 = 1 + -1.
Creationists often think, as they are told to by people like William Lane Craig, that once they establish that the universe had a beginning the argument is basically sewn up. Even if the above two possibilities are dismissed and you take it as read that the universe began, that it was begun by a god can only ever be an argument from ignorance. Without knowing how it happened, you can’t just assert it was one particular thing without eliminating all other possibilities, even the ones people haven’t thought of yet. The potential for spontaneous emergence from the “quantum foam” suggested by quantum mechanics, for one, ensures for the moment that well-formulated alternatives are out there, and you don’t even have to appeal to the un-thought-of.
Question from John: