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    • CommentRowNumber1.
    • CommentAuthorUrs
    • CommentTimeApr 13th 2018

    added also the complementary cartoon for D-branes in string perturbation theory (the usual picture)

    diff, v48, current

    • CommentRowNumber2.
    • CommentAuthorUrs
    • CommentTimeApr 13th 2018

    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.

    • CommentRowNumber3.
    • CommentAuthorUrs
    • CommentTimeSep 29th 2018
    • (edited Sep 29th 2018)

    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.

    diff, v60, current

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