Ok, this the response I got from askaastronomer.com about white holes and their answers about the subject.
White holes as the arise in general relativity are nothing more than a time
reversed black hole used for convenience in solving problems in a certain
coordinate choice. However they do give rise to the idea of wormholes linking
black holes and white holes and the like. Here again sadly the wormholes in
general relativity are not quite physical and even if they were are such that
anything entering a wormhole would cause it to collapse before the object that
entered could pass through.
This is not to say that wormholes cannot exist in the context of M theory as
there strings can certainly pass through multiple branes and so might be used as
conduits from one brane to another, since I could envisage a scattering of a
normal string in the brane with one passing through the brane resulting in de
excitation of the in brane string (destruction of/or alteration of a particle)
and simultaneous excitation of the crossing string (creation of or alteration
of/a particle) that then is carried along to another brane where the reverse
process occurs thus transferring the particle across. How such a thing might act
on larger than a per particle basis is difficult, you'd have to transfer bundles
I guess, which seems far less likely.
At any rate it is possible to have wormholes, the question is is it truly
plausible, and more importantly even if its plausible has nature bothered to
avail itself of wormholes. To these later questions we would at present say no
but cant say definitely not.
Hope that helps,
> The following Ask an Astronomer question was sent to
on March 25, 2009 at 12:15:51 am:
> I have a question for your answers about white holes. If you take into
> account the M-Theory wouldn't white holes be pluasible?, especially if you
> also take into account a multiverse and there being energy and matter before
> the Big Bang. Essentially what I'm suggesting is that black holes and white
> holes are ways for the different universes to take and give matter and energy
> to each other, a way to balance each other.
> I'm a High School Grad. I'm not an expert of any kind, I just have research
It was a better answer then I was expecting.