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Forum index » Science and Technology » Physics » Research
Landscape
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S.M
science forum beginner


Joined: 14 Feb 2006
Posts: 6

PostPosted: Fri May 19, 2006 11:46 am    Post subject: Landscape Reply with quote
Hi,
Can anyone explain to me what the landscape is, and why there are so
many vacua in string theory?
Thanks
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Kris Kennaway
science forum beginner


Joined: 06 Jul 2005
Posts: 7

PostPosted: Sat May 20, 2006 3:38 pm    Post subject: Re: Landscape Reply with quote
On 2006-05-19, S.M <smetalman2006@yahoo.com> wrote:
Quote:
Hi,
Can anyone explain to me what the landscape is, and why there are so
many vacua in string theory?

It's a similar question to "why are there so many different consistent
quantum field theories that one may right down (different gauge
groups, matter content, cosmological constant, etc), but only one of
them gives the standard model?".

In string theory one obtains QFTs at low energies in some
compactification scheme (e.g. from a particular 10-dimensional
space-time geometry). Some kinds of QFTs apparently cannot be
obtained from string theory, but based on current knowledge this does
not seem to be very restrictive.

The extra thing is that in string theory these different QFTs are
embedded in a larger framework, so one may hope to obtain insight into
a selection mechanism on the space of QFTs (string theory vacua) that
may pick out the "right" one (or not). Most studies so far have
looked at frequency distribution of QFTs (gauge groups, matter
content, couplings, etc) in certain classes of string theory
compactifications, but one may hope to do more sophisticated things.

Kris
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