| 研究課題/領域番号 |
23K13095
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| 研究種目 |
若手研究
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| 配分区分 | 基金 |
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| 審査区分 |
小区分15010:素粒子、原子核、宇宙線および宇宙物理に関連する理論
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| 研究機関 | 東京大学 |
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研究代表者 |
LIU Jia 東京大学, カブリ数物連携宇宙研究機構, 特任准教授 (60962016)
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| 研究期間 (年度) |
2023-04-01 – 2025-03-31
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| 研究課題ステータス |
交付 (2023年度)
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| 配分額 *注記 |
4,680千円 (直接経費: 3,600千円、間接経費: 1,080千円)
2024年度: 2,470千円 (直接経費: 1,900千円、間接経費: 570千円)
2023年度: 2,210千円 (直接経費: 1,700千円、間接経費: 510千円)
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| キーワード | Cosmology / HSC / Weak lensing / Machine learning / Graph neural network / neutrino / cosmology / simulation |
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| 研究開始時の研究の概要 |
I will build cosmological massive neutrino simulations that jointly model galaxies and CMB. The planned projects will help answer the key scientific question: what are the absolute masses of the neutrinos? The results will be directly applied to HSC, PFS, DESI, LSST, SO, CMB-S4, and LiteBIRD.
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| 研究実績の概要 |
I advised and contributed to 4 papers on cosmological analysis of the Hyper Suprime-Cam Year 1 data. Using weak lensing non-Gaussian statistics such as peaks, minima, PDF, and scattering transform, we achieved 30% improvement in cosmological constraints compared to the past work.
I advised a project using machine learning method graph neural networks -- a type of deep neural network designed to analyze sparse, unstructured data -- to reconstruct velocity field, achieving 10% improvement compared to existing methods.
I advised a project investigating and confirming the importance of super-sample covariance for non-Gaussian observables, such as the bispectrum, halos, voids, and their cross covariances.
I reported these results in 12 domestic and international conferences and research seminars.
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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 planned research project for year 1 is accomplished. We generated N-body simulations of the dark matter and neutrino fields with FastPM. The neutrino field was modeled using the “linear response” method developed by the PI and collaborators and has been implemented in the FastPM N-body code. We also generated halo catalogs in preparation for Year 2.
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| 今後の研究の推進方策 |
The project is going smoothly as planned. 3 more publications are in preparation, expected to be submitted within 2024, including: (1) "Cosmological constraints from weak lensing scattering transform using HSC Y1 data"; (2) "Void shape is important: neutrino mass from Voronoi void-halos"; and (3) "HalfDome Cosmological Simulations for Stage IV Surveys: N-body Simulations".
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