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(i) Could anyone tell me the difference between p-branes and D-branes please?

(ii) I have recently read that p-branes are some higher dimensional cousins of the extremal Reissner Nordström black hole, what does that actually mean in type IIB string theory?

(iii) If we have a U(2) gauge boson, does that mean it's a 2x2 matrix that is unitary? What other properties does this gauge boson have?

Thank you to all!

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# P-branes v.s. Dp-branes

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