Weak lensing by large scale structure
Weak lensing by large scale structure
Weak lensing by large scale structure
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What does the signal mean?<br />
The cosmic shear signal is mainly a measurement of<br />
the variance in the density fluctuations.<br />
Same “<strong>lensing</strong>” signal<br />
Little bit of matter, <strong>large</strong> fluctuations<br />
Lot of matter, small fluctuations<br />
To first order <strong>lensing</strong> measures a combination of the amount of<br />
matter Ω m and the normalisation of the power spectrum σ 8.
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