2022 Fiscal Year Research-status Report
Probing cosmology with astrophysical gravitational wave background
| Project/Area Number |
20K22348
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| Research Institution | The University of Tokyo |
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Principal Investigator |
Vardanyan Valeri 東京大学, カブリ数物連携宇宙研究機構, 特任研究員 (10876238)
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| Project Period (FY) |
2020-09-11 – 2024-03-31
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| Keywords | Cosmology / Gravitational Waves / Primordial black holes / Cross-Correlations / Multimessenger astronomy / Primordial GW / Large-scale Structure |
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| Outline of Annual Research Achievements |
The original goals of the research proposal have been already achieved. During the past 12 months I have worked on extensions of the proposed projects. I have completed a paper studying anisotropic gravitational-wave background originating from primordial black-hole binaries formed in the early universe, and have assessed the prospects of distinguishing the primordial and astrophysical origins of gravitational-wave binaries. Additionally, I have continued working on modeling the cross-correlations between resolved gravitation-wave sources and galaxies with the aim of testing gravity at cosmological scales, as well as establishing the origin of gravitational-wave binaries via measuring the linear bias of their spatial clustering.
In addition to the main theme of the KAKENHI project, I have also worked on projects of indirect relevance to the main theme. Particularly, I have completed a paper exploring the prospects of generating magnetic fields in the early universe. The studied scenario is also relevant for gravitation-wave generation, and is of interest for future gravitational-wave experiments. I have also released a paper discussing possible tests of fundamental physics using GRBs, and have studied extensions of the LCDM model.
I have completed research visits during which I have delivered invited talks based on the obtained results, as detailed at later sections of this report.
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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 in the scope of the KAKENHI project has progressed smoothly, without any delays on deliverables. Overall, I published more papers than originally planned. I have also visited several institutes in the Netherlands, USA, Armenia (I was also invited to visit CITA and Perimeter in Canada, but my Canadian visa was delayed and I had to cancel/postpone these visits), and have delivered multiple research talks.
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| Strategy for Future Research Activity |
I am planning to continue exploring the astrophysical and cosmological information extractable from the spatial distribution of gravitational-wave sources. There are plans to conduct research in collaboration with an incoming summer student from Columbia University (USA) on the topic of exploring the measurability of the gravitational-wave bias. Other possible research directions involve computing the expected gravitational-wave background using real reconstruction maps of the large-scale structure.
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| Causes of Carryover |
There were some changes in the travel plans during the past fiscal year. I will use the reminder of the funds to purchase additional equipment (e.g. a screen, a tablet, and a computer), and will use the rest for partially supporting my upcoming research visits.
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Research Products
(15 results)
