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In supergravity theory, 11d have 3 dimensional scalar object and 6 dimensional anti-symmetric tensor object. This allows that M-theory have M2 brane and M5 brane only. (By studying on following question, D branes Ns brane and p-branes i found some interesting paper, supermembrane, arXiv:9611203, It seems to me that section an "brane scan" describes ...


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In type IIA string theory, there are D0, D2, D4, D6, D8 branes, and in type IIB there are D1, D3, D5, D7, D9 branes. The D9 is a bit special because it is spacetime filling (p+1 = 10 for p=9). In both theories there are NS5 branes and NS1 "branes", more commonly known as fundamental strings (i.e. the string in string theory). The brane content can be ...


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There are models where the extra dimensions don't need to be curled up. The main issue with extra dimensions is, 'why don't the particles/fields we interact with travel in those directions?' We have extremely good limits on standard model particles (electrons, photons) travelling in extra dimensions. However, it is possible to imagine a string inspired ...



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