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Is there physical content in D Branes?

  1. Apr 23, 2008 #1


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    I am having a hard time to see how/if D Branes are physics, at all.

    We are told that it is the modern notation for Chan Paton charges. But then Marcus and Sagnotti, in the unique paper I have found on the topic, seem to think different

    Group Theory from Quarks at the Ends of Strings.
    Neil Marcus (UC, Berkeley & LBL, Berkeley) , Augusto Sagnotti (Rome U.,Tor Vergata & INFN, Rome) . UCB-PTH-86/27, LBL-22076, ROM2F-86/015, Oct 1986. 10pp.
    Published in Phys.Lett.B188:58,1987.

    Is there any good work relating D-branes to "charges at the end of strings"?
  2. jcsd
  3. Apr 23, 2008 #2


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    Are you specifically interested in string theory as applied to a theory of QCD or string theory in general (as a theory of everything)?

    The need for branes in superstring theory goes beyond the introduction of gauge indices. I think that what Polchinski showed was that branes are required as elementary constituents in addition to strings. Introducing Chan-Paton factors at the end of open strings which end on branes can be done in order to introduce gauge groups but as far as I know, branes do not require Chan Paton factors (I mightbe wrong).

    In any case, have you look at Zwiebach? He gives a nice introduction.
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