D-branes and closed string field theory

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I have done research on string field theory which gives a nonperturbative definition of string theory. The specific topic includes1. We have proposed the dimensional regularization method to deal with the contact term problem of light-cone gauge superstring field theory. We have shown that the string field theory can reproduce the tree amplitudes correctly.2. We have shown that the dimensional regularization can be considered for Witten type string field theory.3. We have shown that the energy for classical solutions in Witten’s open string field theory can be written in terms of a gauge invariant observable.