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GPU-based shear-shear correlation calculation

机译：基于GPU的剪切力相关计算

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摘要

Light rays are deflected when travelling through a gravitational potential: this phenomenon is known as gravitational lensing. It causes the observed shapes of distant galaxies to be very slightly distorted by the intervening matter in the Universe, as their light travels towards us. This distortion is called cosmic shear. By measuring this component it is possible to derive the properties of the mass distribution causing the distortion. This in turn can lead to the measurement of the accelerated expansion of the Universe, as matter clumps together differently depending on its dynamics at each cosmological epoch. The measurement of the cosmic shear requires the statistical analysis of the ellipticities of millions of galaxies using very large astronomical surveys. In the past, due to the computational cost of the problem, this kind of analysis was performed by introducing simplifications in the estimation of such statistics. With the advent of scientific computing using graphics processing units, analysis of the shear can be addressed without approximations, even for very large surveys, while maintaining an affordable execution time. In this work, we present the creation and optimization of such a graphics processing unit code to compute the so-called shear-shear correlation function.
机译：光线在通过重力时会发生偏转：这种现象称为重力透镜。当它们向我们行进时，它会使观测到的遥远星系的形状因宇宙中的介入物质而非常轻微地扭曲。这种变形称为宇宙剪切。通过测量该分量，可以得出引起变形的质量分布的特性。反过来，这可以导致对宇宙加速膨胀的测量，因为物质在每个宇宙学时代取决于其动力学而聚集在一起。宇宙切变的测量需要使用非常大的天文测量对数百万个星系的椭圆率进行统计分析。过去，由于问题的计算成本，这种分析是通过简化此类统计信息的估算来进行的。随着使用图形处理单元进行科学计算的出现，即使在非常大的测量中，也可以不进行近似分析来进行剪切分析，同时保持可承受的执行时间。在这项工作中，我们介绍了这种图形处理单元代码的创建和优化，以计算所谓的剪切剪切相关函数。

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