| Budget Amount *help |
¥4,550,000 (Direct Cost: ¥3,500,000、Indirect Cost: ¥1,050,000)
Fiscal Year 2020: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2019: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2018: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2017: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
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| Outline of Final Research Achievements |
There are 4 forces in nature, that is, electric magnetic, weak, strong and gravity forces. Among these the quantum nature of the gravity is unknown so far. In order to solve this problem, it is promising to consider superstring theory whose fundamental object is string in Planck scale. In our research we consider effective action of the superstring theory which takes account of the quantum effect of the string. By using this effective action, we investigate nature of black hole and inflationary expansion of the early universe. On the interior of the black hole we assumed that there exists a bound state of strings and D0-branes (charged particles) and showed that this bound state reproduces the same gravity potential as the black hole for an faraway observer. On the early universe we constructed a solution of the spacetime which expands rapidly and evaluated cosmological perturbations around this solution.
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