Why is there something rather then nothing?
The problem is, it's ultimately a meaningless question.
Even in Krauss' "universe from nothing" model, the "nothing" is really a "something"- a volatile field of quantum potentiality that due to its inherent volatility, automatically generates universes. This then begs the question- where did that "field" come from?
And this is where the perennial "unmoved mover" debate resumes once again. Either that quantum field was/is un-generated and simply IS, or it was generated from something else. If it was the latter, that same problem continues ad infinitum and you are left with infinitely regressive sequence of causality.
But curiously, in the final analysis, you are still left with something that exists yet was uncreated. If the quantum field was produced by something else, which was produced by something else...stretching infinitely into the "past" (at least, causal past), then that sequence of cause-and-effect which generates everything must be, in of itself, un-generated. So, either the quantum field was un-generated, or the dynamic process which generated that field (and everything else) is un-generated. Either way, by necessity, there must be something is un-generated.
Now, something that is un-generated, is by virtue of that, simply existent. What I mean by that is that it has "existence" or "being" as a fundamental aspect. It simply IS. There is no reason or purpose for its existence. A reason and/or a purpose necessitates a cause.
Now, the question "why" presupposes causality. When someone asks "why", they are inquiring as to a cause, an explanation. Something that is un-generated has no cause, and thus, there is no "why" for it's existence. It's being has no explanation. Mind you, this has been exceedingly difficult for the human mind. If you follow where all the "whys" lead you, you reach something that has no "why". It has a parallel in physics, where if you go back far enough in time closer to the big bang, all of the laws of physics break down and are no longer applicable. Needless to say, they are meaningless at that point.
There is no reason there is something rather than nothing.
Edited by Soma, 30 October 2014 - 09:32 PM.