| 研究課題/領域番号 |
20K22348
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| 研究種目 |
研究活動スタート支援
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| 配分区分 | 基金 |
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| 審査区分 |
0203:素粒子、原子核、宇宙物理学およびその関連分野
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| 研究機関 | 東京大学 |
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研究代表者 |
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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| 研究期間 (年度) |
2020-09-11 – 2024-03-31
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| 研究課題ステータス |
交付 (2022年度)
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| 配分額 *注記 |
2,730千円 (直接経費: 2,100千円、間接経費: 630千円)
2021年度: 1,430千円 (直接経費: 1,100千円、間接経費: 330千円)
2020年度: 1,300千円 (直接経費: 1,000千円、間接経費: 300千円)
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| キーワード | Cosmology / Gravitational Waves / Primordial black holes / Cross-Correlations / Multimessenger astronomy / Primordial GW / Large-scale Structure / Large Scale Strcuture / Gaussian Processes / Cross Correlation |
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| 研究開始時の研究の概要 |
We are able to observe the universe in two major ways, namely, electromagnetic radiations from astrophysical objects, and gravitational waves. Within the scope of this project I will be exploring ways to combine the two observational channels in order to test cosmological models.
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| 研究実績の概要 |
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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| 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
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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| 今後の研究の推進方策 |
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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