Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
1998-07-19
JHEP 9808 (1998) 005
Physics
High Energy Physics
High Energy Physics - Theory
5 pages, no figures, RevTeX 3.0; published version, references added
Scientific paper
10.1088/1126-6708/1998/08/005
We consider Type IIB superstring theory with the addition of n 9-branes and n anti-9-branes (and no orientifolds). The result is a ten-dimensional chiral theory of open and closed oriented strings with gauge group U(n) \times U(n). There is, however, a tachyonic instability which can be understood as the consequence of brane-antibrane annihilation. We therefore expect to recover the usual IIB theory as the tachyon rolls to infinity.
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