Massive gravity and its application to cosmology
| Project/Area Number |
25287054
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Partial Multi-year Fund |
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| Section | 一般 |
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| Research Field |
Particle/Nuclear/Cosmic ray/Astro physics
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| Research Institution | Tokyo Institute of Technology |
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Principal Investigator |
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| Project Period (FY) |
2013-04-01 – 2019-03-31
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| Project Status |
Completed (Fiscal Year 2018)
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| Budget Amount *help |
¥18,200,000 (Direct Cost: ¥14,000,000、Indirect Cost: ¥4,200,000)
Fiscal Year 2017: ¥3,770,000 (Direct Cost: ¥2,900,000、Indirect Cost: ¥870,000)
Fiscal Year 2016: ¥3,640,000 (Direct Cost: ¥2,800,000、Indirect Cost: ¥840,000)
Fiscal Year 2015: ¥4,030,000 (Direct Cost: ¥3,100,000、Indirect Cost: ¥930,000)
Fiscal Year 2014: ¥4,030,000 (Direct Cost: ¥3,100,000、Indirect Cost: ¥930,000)
Fiscal Year 2013: ¥2,730,000 (Direct Cost: ¥2,100,000、Indirect Cost: ¥630,000)
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| Keywords | 重力理論 / 重力 / 宇宙論 |
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| Outline of Final Research Achievements |
In massive gravity, the absence of a ghost in a helicity 0 mode is necessary for the stability of the theory. In order to clarify this feature, as a first step, we began with a point particle theory and obtained the generic condition for the absence of a ghost associated with higher derivative terms. We also showed that the equation of motion for a helicity 0 mode in a massive gravity with a general reference metric remains second order and hence that it does not lead to the ghost instability.
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| Academic Significance and Societal Importance of the Research Achievements |
一般相対性理論においてはゼロである重力子の質量がゼロでない理論とはどのようなものであるか、また、このような理論が宇宙のエネルギーの大部分を占めている暗黒エネルギーを説明できるかという問は、我々の宇宙を記述している理論がどのようなものであるかという根源的な問に答えようとするものです。このような問に答えようとすることは学術的意義のみならず、人々の知的好奇心を満たすものでもあり社会的意義も十分にあると思います。
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Report
(7 results)
Research Products
(8 results)
