Figure 55: Projected cosmological 8-parameter space for a 20,000 square degrees, median redshift of
, 10 bin tomographic cosmic shear survey. Specifications are based on Euclid Yellow book
[550] as this figure is representative of a method, rather than on forecast analysis; the discussion is
still valid with more updated [551] Euclid specifications. The upper panel shows the 1D parameter
constraints using analytic marginalization (black) and the Gaussian approximation (Fisher matrix,
blue, dark grey). The other panels show the 2D parameter constraints. Grey contours are 1- 2- and
3- levels using analytic marginalization over the extra parameters, solid blue ellipses are the 1-
contours using the Fisher-matrix approximation to the projected likelihood surface, solid red ellipses
are the 1- fully marginalized. Image reproduced by permission from [878].
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