Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
2004-06-14
JHEP0411:027,2004
Physics
High Energy Physics
High Energy Physics - Theory
29 pages, harvmac
Scientific paper
10.1088/1126-6708/2004/11/027
We study open strings in the noncritical $c=1$ bosonic string theory compactified on a circle at self-dual radius. These strings live on D-branes that are extended along the Liouville direction ({\it FZZT} branes). We present explicit expressions for the disc two- and three-point functions of boundary operators in this theory, as well as the bulk-boundary two-point function. The expressions obtained are divergent because of resonant behaviour at self-dual radius. However, these can be regularised and renormalized in a precise way to get finite results. The boundary correlators are found to depend only on the differences of boundary cosmological constants, suggesting a fermionic behaviour. We initiate a study of the open-string field theory localised to the physical states, which leads to an interesting matrix model.
Ghoshal Debashis
Mukhi Sunil
Murthy Sameer
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