stbenge <stb### [at] hotmailcom> wrote:
> Some of the new theories point an explanation regarding this. According 
> to the theories, only certain particles can pass between dimensions, or 
> branes.

  Theories are usually devised to try to explain otherwise unexplained
observed phenomena, or in some cases, some consequence of an existing
theory if it is true (eg. the black hole theory is a consequence of GR).

  Exactly which phenomena are these theories trying to explain?

  A theory which doesn't even try to explain some observed phenomenon
is pure speculation and useless.

-- 
                                                          - Warp

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