| Budget Amount *help |
¥19,760,000 (Direct Cost: ¥15,200,000、Indirect Cost: ¥4,560,000)
Fiscal Year 2014: ¥4,940,000 (Direct Cost: ¥3,800,000、Indirect Cost: ¥1,140,000)
Fiscal Year 2013: ¥4,810,000 (Direct Cost: ¥3,700,000、Indirect Cost: ¥1,110,000)
Fiscal Year 2012: ¥10,010,000 (Direct Cost: ¥7,700,000、Indirect Cost: ¥2,310,000)
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| Outline of Final Research Achievements |
We exactly calculate vacuum energy and gauge invariant overlaps of identity-based tachyon vacuum solutions and identity-based marginal solutions in open string field theory. First, by numerical analysis of the theory expanded around the identity-based solutions, we expect the values of the physical quantities for them. Next, we consider a modified KBc algebra in the theory on this background. By use of the algebra, classical solutions on the background are constructed and observables for them, including energy densities and gauge invariant overlaps, are calculable. Finally, these results are applied to evaluate observables analytically for the identity-based solutions.
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