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<blockquote data-quote="Umbran" data-source="post: 2932824" data-attributes="member: 177">By the way, in some places here I may seem to equivocate - I say things like &quot;not necessarily&quot;.&nbsp; This is not to be evasive.&nbsp; I say that when the various theories either don't all agree, or make no predictions on the matter.Depends on which version of the theories you're working with.&nbsp; As I recall it, it is not necessary to define any other space (real or otherwise) in which the branes exist.&nbsp; Alternatively, they exist within our spacetime, and not outside it.&nbsp; Or alternatively, our spacetime is defined by the intersection of branes, and nothing (including the branes themselves) exists outside that intersection.&nbsp; Or, what we call spacetime is one entire brane, and material particles must be anchored to it so that they cannot move beyond it.Um, well, no, not in any human sense. It is one of the brain-benders of cosmology...In order to talk about an &quot;event&quot;, you have to be able to point to a place and time ans say, &quot;it happened there&quot;.&nbsp; But, time and space were created in the Big Bang.&nbsp; There can be no event beforehand, for there was nowhere for the event to take place, and no time at which it might happen.</blockquote>

[QUOTE="Umbran, post: 2932824, member: 177"] By the way, in some places here I may seem to equivocate - I say things like "not necessarily". This is not to be evasive. I say that when the various theories either don't all agree, or make no predictions on the matter. Depends on which version of the theories you're working with. As I recall it, it is not necessary to define any other space (real or otherwise) in which the branes exist. Alternatively, they exist [i]within[/i] our spacetime, and not outside it. Or alternatively, our spacetime is [i]defined by[/i] the intersection of branes, and nothing (including the branes themselves) exists outside that intersection. Or, what we call spacetime is one entire brane, and material particles must be anchored to it so that they cannot move beyond it. Um, well, no, not in any human sense. It is one of the brain-benders of cosmology... In order to talk about an "event", you have to be able to point to a place and time ans say, "it happened there". But, time and space were created in the Big Bang. There can be no event beforehand, for there was nowhere for the event to take place, and no time at which it might happen. [/QUOTE]

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