2020 Fiscal Year Research-status Report
The Hubble parameter experimental puzzle in the context of Modfied Gravity models
| Project/Area Number |
20K03969
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| Research Institution | Kyoto University |
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Principal Investigator |
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| Project Period (FY) |
2020-04-01 – 2025-03-31
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| Keywords | Cosmology / Modified gravity models / H0 tension |
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| Outline of Annual Research Achievements |
Last year, it was a fantastic year for my research, as I have developed and learned the tools necessary for advancing my research. Thanks to this achievement, I could post on the arXiv 12 papers, which represents the maximum achievement in my career. In particular, I have made advances from the theory side, as I have proposed new models for modifications of gravity which pave the way for a playground for any desired evolution for the Hubble factor H(z). Since the strongest tension in today's cosmology exactly comes from the Hubble factor evolution, which differs from the one of General Relativity, I believe the theories I have introduced (together with my collaborators, in particular with prof. Mukohyama, Kyoto U.) can indeed address this issue. Furthermore, thanks to the workstation that I bought with the Kakenhi grant, I could perform Montecarlo samplings that I have used in order to set constraints for these models. All thi theoretical and computational apparatus has helped understanding the ways we need in order to solve the H0 tension above mentioned, and I hope, even the weak gravity tension that some experiments seem to report. Although to achieve weak gravity sounds a more complicated task, still I believe the models I have recently introduced have the possibility to solve this tension as well.
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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
The research is going as planned. I have introduced new models of modified gravity, and applied techniques to study them, in particular to see whether they can address the H0 tension and possible also weak gravity. The models which have been introduced have shown to be stable and without introducing any new light degree of freedom which could give rise to non-zero results as for fifth-force experiments. I believe the research will progress further into the discovery of interesting new phenomenological footprints for this theory. It is now the time to understand how to confront theory with the data more and more.
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| Strategy for Future Research Activity |
For this new year, I plan to continue studying the phenomenology of the models I have recently introduced. I believe they can address the tensions we see in the data in today's cosmology, and as such, they can become of strong relevance in the near future. For this goal, it is then necessary to keep studying them and to improve the techniques out of which we are able to set constraints on the models. This is the plan I have for this new academic year.
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| Causes of Carryover |
Because of Covid-19, it is possible that I will not use travel grant much for traveling. Because of this reason, I might implement the grant for upgrading computers or to sponsor the visit of some postdoc/professors if possible.
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