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Originally Posted by Suzy
Just found out the answer to this one.
The 11th dimension is TIME. 10 dimensions + time. Doh!  The string theory model doesn't work with anything other than these 11 dimensions. |
Actually, I was just looking through the link Steven recommended on string theory in this thread and this guy says:
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The 26 dimensions required by "bosonic" string theory include time, so that means 25 dimensions of space instead of the three that we're familiar with. (And superstring theory describes "only" nine dimensions of space) …
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… plus one for time = 11 dimensions. [EDIT: oops 9 + 1 = 10 .. got a bit ahead of myself there].
Not sure I've ever heard of this bosonic version of string theory, though.
Witten's version of M-Theory calls for 11-dimensions which unites all five competing string theories (and supersedes them).
Cheers