I am getting quite confused with this terminology when I read the papers. Like while constructing the near horizon AdS3 in the D1−D5 system one considers IIB on R1,4×M4×S1 and one "wraps" N1 D1 branes on the S1 and N5 D5-branes on M4×S1. What does it exactly mean?
Coming from reading how D-branes were introduced in Polchinksi's book I would think that in a 9+1 spacetime Dp branes are some planar streched out stuff with a p+1 worldvolume and whose p spatial dimensions are transverse to the 9−p spatial dimensions which have been compactified and T-dualized. So are we now saying that its possible that instead of imagining the Dp branes as some set of periodically arranged planes on the T-dual torus we can also think of their spatial world being compactified on some arbitrary p-manifold?
If "wrapping" is really a choice of topology for the p-spatial dimensions of the Dp-brane then what determines this choice? Is this something put in by hand or does this happen naturally?
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