銀河団重力レンズ効果とCMB重力レンズ効果との相関によるニュートリノ質量への制限

我分析性地开发了一种改进的傅立叶幂函数Shapelets(FPFS)算法，用于准确和快速的剪切估计。该方法现在包括对困扰所有形状测量算法的偏差来源的分析校正：包括噪声偏差(由于可观测量的非线性组合中的噪声)和选择偏差(由于剪切的星系或多或少可能被检测到)。重要的是，这些解析解不依赖于外部图像模拟的校准。对于孤立的星系，小于0.001的乘性偏差和小于0.0001的加性偏差现在满足第四阶段实验的科学要求。对于暗星系，FPFS也能准确工作，对恒星污染有很强的抵抗力。我为HSC三年的宇宙切变测量进行了几次系统的零测试。一是检验望远镜和大气绕射引起的点扩散函数模型残差在宇宙切变测量中的系统性。我将星系形状与恒星形状相互关联，以检测星系形状中的PSF模型残差。另一个零检验是检查弱透镜科学中的B模系统学。然后我研究了重子效应的影响，即宇宙剪切测量中本征排列的影响。我已经建立了HSC三年弱透镜宇宙学约束的分析管道。

I analytically developed an improved version of the Fourier Power Function Shapelets (FPFS) algorithm for accurate and fast shear estimation. The method now includes analytic corrections for sources of bias that plague all shape measurement algorithms: including noise bias (due to noise in nonlinear combinations of observable quantities) and selection bias (due to sheared galaxies being more or less likely to be detected). Crucially, these analytic solutions do not rely on calibration from external image simulations. For isolated galaxies, the small residual less than 0.001 multiplicative bias and less than 0.0001 additive bias now meet science requirements for Stage IV experiments. FPFS also works accurately for faint galaxies and robustly against stellar contamination.I conducted several systematic null tests for the HSC three-year cosmic shear measurement. One is to test the systematics in cosmic shear measurement caused by model residuals of point spread function due to diffraction of telescope and atmosphere. I cross-correlate galaxy shape with star shape to detect the PSF modelling residual in the galaxy shapes. The other null test is to check the B-mode systematics in the weak-lensing science. Then I looked into the influence of baryonic effect, the influence of the intrinsic alignment in the cosmic shear measurement. I have built up the analysis pipeline for HSC three year weak lensing cosmological constraints.