String Theory Question

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igorsboss

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What are the names of the 11 dimensions postulated by String Theory?<br /><br />Alternately, if they don't have names, do any of them have a meaningful interpretation?
 
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igorsboss

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Sneezy, Sleepy, Creepy, Happy, Sleasy, Dopey, Ditzy, Joey, Grumpy, Bashful, Doc.<br /><br />Yeah, yeah, that's not what I mean...<img src="/images/icons/wink.gif" /><br />
 
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igorsboss

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No responses yet... Hmmm....<br /><br />Are all 11 dimensions representationless?
 
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igorsboss

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That was a great article, for sure.<br /><br /><font color="yellow">It's written in a manner for those not fully conversant with the concepts of modern physics..</font><br /><br />I recently earned a BA - Math (Teacher preparation option), with enough physics credits to earn a supporting teaching endorsement in Physics. I can think abstractly enough. I'm looking for meaning behind the acronyms, as it were.<br /><br />Here are some key points I took away...<br /><br /><font color="yellow">M-theory (M for “membrane”</font><br /><br />Aha! Words mean so much more than letters alone, don't they?<br /><br /><font color="yellow">point particles are 0-branes, strings are 1-branes, membranes are 2-branes, and so on.) For the p-dimensional case, some wag dubbed them p-branes (pronounced “pea brains”). </font><br /><br />Fabulous!<br /><br />So M Theory must be about lower-dimensional subspaces of the 11 dimensional space. These subspaces are called branes.<br /><br />Although all 11 dimensions are too hard to work with directly, we can still hope to get a lower-dimensional glimpse of the elephant by looking at one of the branes.<br /><br /><font color="yellow">They showed that if you “curled up” one of the extra dimensions into a circle with radius R, the theory was the same if we curled up this dimension with radius 1/R. This is now called T- duality: R <--> 1/R </font><br /><br />Excellent! Profound! This sounds like inversion in a circle from my geometry class. Very powerful stuff here.
 
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qzzq

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This is, imho, the best website on String Theory. It features both a basic and a more advanced explanation of the theory: The Official String Theory Website<br /><br /><ul type="square"><b>How many string theories are there?</b><br /><br />There are several ways theorists can build string theories. Start with the elementary ingredient: a wiggling tiny string. Next decide: should it be an open string or a closed string? Then ask: will I settle for only bosons ( particles that transmit forces) or will I ask for fermions, too (particles that make up matter)? (Remember that in string theory, a particle is like a note played on the string.) <br /><br />If the answer to the last question is "Bosons only, please!" then one gets bosonic string theory. If the answer is "No, I demand that matter exist!" then we wind up needing supersymmetry, which means an equal matching between bosons (particles that transmit forces) and fermions (particles that make up matter). A supersymmetric string theory is called a superstring theory. There are five kinds of superstring theories, shown in the table below <i>(see the link)</i>. <br /><br />The final question for making a string theory should be: can I do quantum mechanics sensibly? For bosonic strings, this question is only answered in the affirmative if the spacetime dimensions number 26. For superstrings we can whittle it down to 10. How we get down to the four spacetime dimensions we observe in our world is another story.</ul> <div class="Discussion_UserSignature"> <p> </p><p>***</p> </div>
 
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alokmohan

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Boson is named after India physicist satyendranath Bose.While talking about boson remember me.
 
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igorsboss

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<font color="yellow">For superstrings we can whittle it down to 10.</font><br /><br />I'm fine with that. Really. However, this takes me back to the question at the top of this thread... Perhaps if I rephrase my question, it will become clearer.<br /><br />For each of these 10 dimensions in your favorite superstring theory, what is the (name, ramification, specification, effect, or freedom) of that dimension?<br /><br />For example:<br />Dimension A says how tight the strings are.<br />Dimension B says how long the strings are.<br />Dimension C says how wide the strings are.<br />Dimension D says how curly the strings are.<br />etc...<br /><br />Now, it might be the case that nobody knows, so that all we can know is how many dimensions, but not what each or any of them means.
 
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qzzq

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They are all spatial dimensions, so they don't have specific functions. If another dimension were to unfold, we may end up with a 5-D Universe. <div class="Discussion_UserSignature"> <p> </p><p>***</p> </div>
 
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