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Boundary fermions and coincident D-branes
  KTH/Nordita/SU seminar in Theoretical Physics [before December 2013]

Wednesday 31 January 2007
from 11:00 to 12:00
at AlbaNova ( FB41 )
Speaker : Linus Wulff (SU)
Abstract : The higher-dimensional objects in string theory known as D-branes have been a source of much of the interesting developements in the subject during the past ten years. A very interesting phenomenon occurs when several of these D-branes become coincident: The abelian gauge theory living on each brane is enhanced to a non-abelian gauge theory living on the stack of coincident branes. This gives rise to interesting effects like the natural appearance of non-commutative geometry. The theory governing the dynamics of these coincident branes is still poorly understood however. I will describe an attempt to better the situation by using so-called boundary fermions, originating in considerations of open strings ending on the stack of branes, and writing down actions for coincident branes using these instead of matrices to describe the non-abelian fields. It can be shown that by gauge-fixing and suitably quantizing these boundary fermions the non-abelian action that is known, the Myers action, can be reproduced. Furthermore the action formulated using boundary fermions also posseses a symmetry known as kappa-symmetry, making it a candidate for a full supersymmetric action for coincident D-branes, at least in a certain approximation.

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