Properties and formulation of nonperturbative excitations in string theor

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We propose a description of D-branes, which are solitons in string theory, as BRST invariant second-quantized states in the OSp invariant closed bosonic string field theory. For the purpose of a supersymmetric extension of this construction, we investigate the light-cone gauge NSR superstring field theory. We propose a dimensional regularization scheme to regularize the unwanted divergences in this string field theory. In order to verify our prescription, we construct a superconformal field theory in noncritical dimensions as a worldsheet theory for such string theory.