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| Paper: |
Statistical Challenges of Weak Gravitational Lensing |
| Volume: |
371, Statistical Challenges in Modern Astronomy IV |
| Page: |
59 |
| Authors: |
Bernstein, G. |
| Abstract: |
Weak gravitational lensing is the detection of subtle distortion (shear) of background images due to the gradients of the gravitational-lensing deflection by the mass of foreground objects. It is a signal that is very straightforward to predict once a model for the mass distribution of the Universe is available, and promises to offer determination of cosmological parameters to very high accuracy in the coming decade. When surveys of > 109 background galaxies are completed, the statistical challenges that must be faced include: (1) measuring the lensing distortion to parts per thousand accuracy when the intrinsic shapes of galaxies are irregular, and are viewed through distorting optics/atmosphere, noise, and finite sampling; and (2) extracting the most information from the 3-dimensional shear field, given that the intervening mass distribution is a highly non-Gaussian field. |
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