Re: What color is a domain wall?
From: Mark Fergerson (nunya_at_biz.ness)
Date: 06/27/04
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Date: Sun, 27 Jun 2004 22:55:04 +0000 (UTC)
Hannu Rjaniemi wrote:
> If I lived in a universe with a domain wall, what would it look like?
>
> To be more precise, suppose I have a universe where the Standard Model
> is not quite the same as ours, i.e. the gauge group is not SU(3) x
> SU(2) x U(1). Now introduce (via some magic) a bubble of our Standard
> Model into this universe. This region should, I believe, be separated
> from the rest of the universe by some sort of domain wall, a
> topological defect.
Seems to me the boundary will be unstable.
> What would it look like? I realise that the answer may depend on what
> sort of particle states, confinement et cetera is allowed by the
> "alien" gauge group, but if I sat in my Standard Model bubble, what
> would the sky look like? I suppose there might be some sort of
> scattering, since penetrating the wall might be energetically
> expensive. But it might not be completely opaque.
>
> Any thoughts?
Either light won't be able to propagate into it at all
(mirror) or won't be able to get out (black).
But the stability issue keeps bugging me; you have
different versions of spacetime, and they will have
different zero-point energy levels and stuff like that. I
personally think the boundary will be bright as all hell,
and racing one way or the other near (or at) c as the one
kind of symmetry collapses into the other kind.
It'd make a dandy doomsday weapon though...
Mark L. Fergerson
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