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complementary, that is, to the cartoon for the black D-branes which I had added a few days back. That must have been in the brief period where the announcement mechanism was not working.
have added this:
But actual checks of the proposal that D-brane charge is given by K-theory, via concrete computation in boundary conformal field theory, have revealed some subtleties:
Stefan Fredenhagen, Thomas Quella, Generalised permutation branes, JHEP0511:004, 2005 (arXiv:hep-th/0509153)
It might surprise that despite all the progress that has been made in understanding branes on group manifolds, there are usually not enough D-branes known to explain the whole charge group predicted by (twisted) K-theory.
finally added the original article
although it appears that we have modified the type II theory by adding something new to it, we are now arguing that these objects are actually intrinsic to any nonperturbative formulation of the type II theory; presumably one should think of them as an alternate representation of the black $p$-branes
as well as more review texts, such as
The ambition of that book is really nice. Sad that the publisher didn’t bother to have a native English speaker look over it even briefly.
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