I don't know about why anything exists, but it stands to reason for me at least that if there is a non-zero net energy, without any boundary conditions, then it has to expand. That it expanded and cooled down into its current form is coincidental.
Why there is non-zero energy in the first place is, I'll agree, odd. Your idea of it balancing out some negative energy elsewhere is interesting.. Maybe we're just the positive side of a temporary virtual particle in a higher universe-particle "foam" like the quantum foam.
Why there is non-zero energy in the first place is, I'll agree, odd. Your idea of it balancing out some negative energy elsewhere is interesting.. Maybe we're just the positive side of a temporary virtual particle in a higher universe-particle "foam" like the quantum foam.