Exactly. Thanks for your affirmation. .. And space itself expanding doesn't require 'dark energy' and has nothing to do with momentum, acceleration etc.
> spdustin
That's the uncertain part of the question. It's the same when you ask Does time require a force that drives it forward? The answer is We don't know yet. -- The certain part of the question is: scaling of space (in cosmic scale) can't be accelerated by 'dark energy' nor slowed down by gravity. It's not about mass, energy, momentum etc. - I really described it in my paper (see post above).