| Budget Amount *help |
¥5,070,000 (Direct Cost: ¥3,900,000、Indirect Cost: ¥1,170,000)
Fiscal Year 2013: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2012: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2011: ¥2,210,000 (Direct Cost: ¥1,700,000、Indirect Cost: ¥510,000)
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| Research Abstract |
The purpose of this research is to overcome the ``contact term problem", which is a divergence problem possessed by superstring field theory and has been an obstacle to the formulation of the theory for a long time. We proposed a novel regularization scheme in which the number of space-time dimensions are shifted to a sufficiently large negative value. We verified our regularization mainly in the context of the light-cone gauge superstring field theory in the NSR formalism. We have shown that our regularization works well at least for the tree-level amplitudes. We have made a progress also in the analysis of the multiloop amplitudes.
In addition to these analyses, we have pursued a new formulation of string field theory in which the string worldsheet is discritized. We also have studied cosmology particularly including quantum effects and back-reaction of matter fields.
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