[FPSPACE] Time to flip?

[Jens Kieffer-Olsen]

>From  <http://arxivblog.com/?p=71> http://arxivblog.com/?p=71 an interesting
hypothesis about our Universe bouncing
the dimension of time back and forth between Lorentzian and Euclidean:
 
It don't get much weirder than this. The universe is about to lose its
dimension of time [...]
 
[...] the universe we see around us is a 4-dimensional cosmos called a
braneworld embedded
in a multidimensional universe. The "signature" of our universe is the
number of space and
time-like dimensions it has: in our case we got 3 space-like dimensions and
one time-like
dimension. It's what astrobods call a Lorentzian universe. 
 
But our universe may not always have been like this. Some theorists think it
may once have
had a Euclidean signature meaning that all the dimensions were space-like.
Now Marc 
Mars and a few pals in Spain say that the Universe's signature might be
about to flip from
Lorentzian to Euclidean. In other words, our dimension of time is about to
turn space-like. 
 
Mars has calculated what it's like to be an observer in a universe that is
about to flip and
get this: it would look as if it were expanding and accelerating away from
us. Sound familiar?
 
Ref:  <http://arxiv.org/abs/0710.0820> arxiv.org/abs/0710.0820: Is the
Accelerated Expansion Evidence of a Forthcoming change
of Signature?
 
--
Jens Kieffer-Olsen
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