Title of article :
D-branes and physical states Original Research Article
Author/Authors :
Sanjaye Ramgoolam، نويسنده , , L?rus Thorlacius، نويسنده ,
Issue Information :
روزنامه با شماره پیاپی سال 1997
Pages :
19
From page :
248
To page :
266
Abstract :
States obtained by projecting boundary states, associated with D-branes, to fixed mass level and momentum generically define non-trivial cohomology classes. For on-shell states the cohomology is the standard one, but when the states are off shell the relevant cohomology is defined using a BRST operator with ghost zero-modes removed. The zero-momentum cohomology falls naturally into multiplets of SO(D − 1, 1). At the massless level, a simple set of D-brane configurations generates the full set of zero-momentum states of standard ghost number, including the discrete states. We give a general construction of off-shell cohomology classes, which exhibits a non-trivial interaction between left- and right-movers that is not seen in on-shell cohomology. This includes, at higher mass levels, states obtained from typical D-brane boundary states as well as states with a more intricate ghost dependence.
Keywords :
* Branes , * BRST cohomology , * Boundary states , * Off-shell states
Journal title :
Nuclear Physics B
Serial Year :
1997
Journal title :
Nuclear Physics B
Record number :
878342
Link To Document :
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