(November 4, 2009 at 6:48 pm)leo-rcc Wrote: As for laws of physics working differently in other universes, that too is a possibility but should we be able to detect their effects in this universe that means that their are either more laws at play than the ones we know to be working in our part of the universe, or our laws as we know them may be proven to be wrong, or they may be some other reason that I can't think of. Either way we would need data to verify and test.That's the whole point though, you wouldn't be able to. The universe in which we live is a closed system; it isn't affected by any external systems. Thus if they exist, it is impossible to detect them.
It's all hypothetical, and I'm not disagreeing with you in any particular way, but the fact is that the mathematical models work and it could very well be the case. You can dismiss it without evidence, but that doesn't mean you have to refuse to discuss it. We dismiss God, yet we discuss God at length. It's an idea, and to understand the idea you need to have definitions for "universe" that comply with the "multiverse", hence why "reality" is usually used as describing the set of everything that exists.
