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How many dimensions do physicist think exist?


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Initial post: Jan 14, 2013 8:46:52 PM PST
Last edited by the author on Jan 14, 2013 8:48:26 PM PST
D. Vicks says:
I've heard that some of the physicist at Cambridge think that there are 10 or 11.

In reply to an earlier post on Jan 14, 2013 9:20:07 PM PST
depends on context

our universe has ten dimensions
because it is a vibrating membrane from an 11 dimensional thingy

which implies that there could be oodles of other universes along tht 11th dimension each created by a vibrating ten dimensional membrane like ours is

but tht is just a math model

some new models go as high as 248 dimensions

we can only see 4 of them so do the other really matter to you

Posted on Jan 14, 2013 9:27:34 PM PST
D. Vicks says:
Can String theory or muti-dimensions be proven in a lab?

In reply to an earlier post on Jan 14, 2013 9:38:13 PM PST
no

there are many string theories
they are all special cases of m-theory

no known way to prove the models using that approach

In reply to an earlier post on Jan 14, 2013 9:55:27 PM PST
Doctor Who says:
String theory only allows 10,11 or 26 dimensions without introducing a tachyon. The 26 dimensional theories suffer from a lack of normal matter, so they are unlikely. The 10 dimensional string theories include hadrons, so they are more likely. The 11 dimensional M-theory is also a possibility. It has the potential to unify the other string theories into one, if correct. However, there has been no evidence for any extra dimensions experimentally at this point. Experimentally, there is also no evidence for string theory. Any discussion of the topic is theoretical in nature and purely speculative as to whether reality is actually described by any of the above theories.
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Discussion in:  Science forum
Participants:  3
Total posts:  5
Initial post:  Jan 14, 2013
Latest post:  Jan 14, 2013

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