| Project/Area Number |
21740193
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| Research Category |
Grant-in-Aid for Young Scientists (B)
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| Allocation Type | Single-year Grants |
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| Research Field |
Particle/Nuclear/Cosmic ray/Astro physics
|
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| Research Institution | Iwate University (2011-2012)
Waseda University (2009-2010) |
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Principal Investigator |
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| Project Period (FY) |
2009 – 2012
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| Project Status |
Completed (Fiscal Year 2012)
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| Budget Amount *help |
¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000)
Fiscal Year 2012: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2011: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2010: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2009: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
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| Keywords | 位置天文学 / 天体暦 / 天文定数 / 重力理論 / 理論天文学 / 宇宙論 / 一天文学 / 宇宙物理学 / 数理科学 / 相対論・重力波 |
|---|
| Research Abstract |
We investigated the secular increase in astronomical unit reported by Krasinsky and Brumberg from the planetary radar and spacecraft orbital tracking data, 15 +/- 4 m/century in terms of verification of gravitational theories. For this purpose, (a) we derived the approximate metric of Einstein's field equation which can describe the time variation of dark matter density in solar system, (b) we showed the method which can calculate the light/signal propagation in the time-dependent gravitational field by using the time transfer function based on Synge's world function, (c) we obtained the perturbation force due to inhomogeneous LTB model, and evaluated its effect on the planetary motion, and (d) based on the orbital angular momentum conservational law, we proposed new scenario to resolve the secular increase in astronomical unit.
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