- #1
Sauron
- 102
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If you see the usual pictures of D-Branes or you go with the idea of the brane univereses you would get the impresion that branes are infinite planes. But, are there more viewpoints?.
I guess that tehere should be, but I am not sure (that´s why I open the thread aftheall). The most generic brane is a p-brane, whcih is nothing else that the natural generalization to most dimensions of the idea of an string. If the strings are supossed to be Planck sized a p-brane should also be so, unnles there is some strong motivation to think otherwise.
The most strightforward way to realize the p-brane idea, I belive, are the (two and five dimensional) M-branes. You need them as sources of some fields that appear in the low energy limit of M-theory (11 dimensional supergravity). From this viewpoint I see no dfinitive clue of which size they should have (probably it would depend on the supoort of the fields they are source for). But on the other hand we have dualities. Under some this dualities the M2-Brane would become an string, That would imply, I guess, that they must hae a topology [tex] S^1xI[/tex] (I beeing the unit interval). That would imply that they would have Planckanian size.
Well, there are more brane fauna, and every brane has it´s own indiosincracy, so I want to consider all of them in a single post. they could be adrresed in subsequent ones...
I guess that tehere should be, but I am not sure (that´s why I open the thread aftheall). The most generic brane is a p-brane, whcih is nothing else that the natural generalization to most dimensions of the idea of an string. If the strings are supossed to be Planck sized a p-brane should also be so, unnles there is some strong motivation to think otherwise.
The most strightforward way to realize the p-brane idea, I belive, are the (two and five dimensional) M-branes. You need them as sources of some fields that appear in the low energy limit of M-theory (11 dimensional supergravity). From this viewpoint I see no dfinitive clue of which size they should have (probably it would depend on the supoort of the fields they are source for). But on the other hand we have dualities. Under some this dualities the M2-Brane would become an string, That would imply, I guess, that they must hae a topology [tex] S^1xI[/tex] (I beeing the unit interval). That would imply that they would have Planckanian size.
Well, there are more brane fauna, and every brane has it´s own indiosincracy, so I want to consider all of them in a single post. they could be adrresed in subsequent ones...
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