[ExI] End of time?
scerir at libero.it
Wed Sep 29 17:42:34 UTC 2010
I've got the impression that it is sometimes dangerous to think in terms of
'time' (or space-time). As Spike suggested, the question comes down to whether
the 'vacuum state' - and not time itself - is stable. http://en.wikipedia.
org/wiki/Vacuum_state . Our universe might be a pocket of low energy (in terms
of VEV), which might decay further if this it is a meta-stable state. The meta-
stable vacuum with a small lambda may expand for a very long time if the decay
is slow enough (inflationary state). If the vacuum state is not stable there
might be some phase transition that ends the universe (as we know it). As
somebody (L.B.C.) wrote the argument of that paper only really makes sense if
we can understand the stability of the vacuum. Sidney Coleman and Frank di
Luccia worked the theory of an unstable false vacuum with gravity in 1980 http:
//prd.aps.org/abstract/PRD/v21/i12/p3305_1 and this is still the main paper
which leads to the theory of nucleating bubbles of real vacuum expanding within
a false vacuum.
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