| 研究課題/領域番号 |
16K05348
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| 研究機関 | 京都大学 |
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研究代表者 |
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| 研究期間 (年度) |
2016-04-01 – 2019-03-31
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| キーワード | Massive gravity / Modified gravity / Dark Energy / Cosmology |
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| 研究実績の概要 |
During the last year I have worked on massive gravity and other related modified gravity models. In each of these models, I have attempted to search for a modification of gravity which could get a better fit to the data, and at the same time, to give some insight of how a viable theory of massive gravity might look like.
Since last April, I have written seven papers published in high-impact-factor peer-reviewed journals.
I am satisifed with the papers I have written and by the information gathered for my research in the last year. In particular, I have understood how to introduce matter terms in the Minimal Theory of Massive Gravity (MTMG). I have studied the phenomenology of the MTMG and found it can fit late-time experimental data very well, stimulating further research in this field.
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| 現在までの達成度 (区分) |
現在までの達成度 (区分)
2: おおむね順調に進展している
理由
I believe the project has progressed in a good way. I have smoothly finished the papers related to project I had intended to study.
In particular, at the moment, I am learning how to use the Hamiltonian formalism in order to constrain theories, so that the new built-up theories will have fewer degrees of freedom with respect to the unconstrained system.
Also I have written down a computer numerical code which, by means of experimental data and a Monte-Carlo-Markov-Chain algorithm, has set constraints to some of the models I have recently introduced, setting bounds for the parameters of the
theories.
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| 今後の研究の推進方策 |
In the future, I plan to extend both the theoretical analysis and experimental constraints on the models I have been working on.
In particular I want explore the possibility of having a scalar field which interact with a massive graviton, which can pass solar system constraints and at the same time represent a viable model of dark energy. Afer this, I would like to explore the possibility of defining a minimal theory with two graviton, i.e. the so called bigravity.
I also want to extend further the already written numerical code in order to cover all the experimental data, which are sensitive to dark energy models and the late-time dynamics of the universe.
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| 次年度使用額が生じた理由 |
Since in the last year I bought the necessary computer-power to be active in my field, in the next fiscal year, I will want to interact with people more both in Japan, Asia, and Europe, where most of my present collaborators live.
I will need then funding to either go abroad or invite people to work me with for some time in Japan.
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| 次年度使用額の使用計画 |
I will use most of the grant to travel to Europe, Asia, and Tokyo. Nonetheless I may also invite collaborators to work with me in Kyoto.
I may participate to conferences/workshops. On the other hand I prefer to meet collaborators individually so that we can focus on starting and/or developing and/or finishing some common projects.
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