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arXiv 2203.08152astro-ph.CO
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CMB透镜功率谱与下一代测量

CMB lensing power spectrum with next generation surveys

Louis Legrand, Julien Carron

摘要:

我们介绍了一种新的估计CMB透镜功率谱,连同其可能性,基于迭代透镜重建。尽管透镜映射的复杂性增加,但该估计与标准二次估计有相似之处。最重要的是,它对透镜重建的噪声和宇宙学假设是无偏的。这种新的谱估计器可以加倍的约束透镜振幅相比,二次估计,同时保持数值成本控制和对误差的鲁棒性。

英文摘要:

We introduce a new estimator of the CMB lensing power spectrum, together with its likelihood, based on iterative lensing reconstruction. Despite the increased complexity of the lensing maps, this estimator shares similarities with the standard quadratic estimator. Most importantly, it is unbiased towards the assumptions done on the noise and cosmology for the lensing reconstruction. This new spectrum estimator can double the constraints on the lensing amplitude compared to the quadratic estimator, while keeping numerical cost under control and being robust to errors.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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