Tachyon condensation, boundary state and string field theory

초록

We discuss tachyon condensation in the framework of boundary state formulation and in string field theory. The boundary state in the background of tachyon condensation and the NS B-field is explicitly constructed. Then we perform canonical quantization of open string on it unstable D-brane in the background of tachyon condensation. Evaluating the Polyakov path-integral on a strip. we obtain a field theoretical propagator in the open string theory. The behaviours of the boundary state and the open string field have been examined near the infrared fixed point of the condensation.

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