2021 Fiscal Year Research-status Report
Exploring magnetic properties of neutron-star matter through gravitational waves
| Project/Area Number |
18K03622
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| Research Institution | Osaka University |
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Principal Investigator |
Baiotti Luca 大阪大学, インターナショナルカレッジ, 准教授 (00574047)
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| Project Period (FY) |
2018-04-01 – 2023-03-31
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| Keywords | Neutron stars / Binary mergers / Equations of state / Gravitational waves / Magnetic fields |
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| Outline of Annual Research Achievements |
In Fiscal Year 2021 I have worked on the analysis of results from our accurate simulations of binary neutron star mergers with with the help of collaborators in and outside Japan. In particular, we have also focused on investigating the effect of a new type of equations of state that involve a quark-hadron crossover at higher densities, rather than a first-order phase transition to quark matter.
We have found interesting results on the relations between observable gravitational radiation emitted after the merger and the properties of the equation of state. This may realistically enable us to distinguish crossover equations of state from other types of equations of state via observations performed through third-generation gravitational wave detectors.
However, we have not yet found a satisfactory results for the combined effects of these new equations of state with the development of seed magnetic fields, mostly for lack of resolution related to the limited computational resources we had access to in the past fiscal year.
Anyway, despite the current computational limitations, we have qualitatively explored different initial orientations for the magnetic fields inside the neutron stars. While the structure of the magnetic field in pre-merger neutron stars is not well known; however, it is expected to have a secondary influence on the magnetic field structure and amplitude after the merger, because of exponential amplification and saturation processes, which we can partly address in our simulations.
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| Current Status of Research Progress |
Current Status of Research Progress
4: Progress in research has been delayed.
Reason
The project has been delayed because of lack of time due to increased teaching load, also related to the COVID-19 pandemic. Furthermore, it has been difficult to find and work with students on this project, again because of the pandemic. This is also one of the reasons why I did not spend all the funds allocated for the past fiscal year.
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| Strategy for Future Research Activity |
Hopefully, the pandemic will lessen its influence on research and education, but if not, I may not be able to work with research students as much as planned. Even if delayed, the project will go on following the original lines.
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| Causes of Carryover |
Because of the COVID-19 pandemic, in Fiscal Year 2021 travel to conferences etc. was basically not possible and I could not work with research assistants. Given the situation, I plan to use funds mostly for buying and upgrading computational hardware and software.
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