2016 Fiscal Year Annual Research Report
Cosmic acceleration by means of a massive graviton
Publicly Offered Research
| Project Area | Why does the Universe accelerate? - Exhaustive study and challenge for the future - |
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| Project/Area Number |
16H01099
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| Research Institution | Kyoto University |
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Principal Investigator |
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| Project Period (FY) |
2016-04-01 – 2018-03-31
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| Keywords | Massive gravity / Modified gravity / Dark Energy / Cosmology |
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| Outline of Annual Research Achievements |
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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| Current Status of Research Progress |
Current Status of Research Progress
2: Research has progressed on the whole more than it was originally planned.
Reason
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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| Strategy for Future Research Activity |
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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[Journal Article] Cosmology in generalized Proca theories2016
Author(s)
A. De Felice, L. Heisenberg, R. Kase, S. Mukohyama, S. Tsujikawa and Y. l. Zhang
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Journal Title
Journal of Cosmology and Astroparticle Physics
Volume: 06
Pages: 048
DOI
Peer Reviewed / Open Access / Int'l Joint Research / Acknowledgement Compliant
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