Primordial Non-Gaussianity and Bispectrum Measurements in the Cosmic Microwave Background and Large-Scale Structure : Figure 14

]>Primordial Non-Gaussianity and Bispectrum Measurements in the Cosmic Microwave Background and Large-Scale Structure : Figure 14

(a)

(b)

Figure 14: (a) Measurements of the skewness of the matter distribution in N-body simulations as a function of the smoothing scale

R

for the non-Gaussian texture model (filled symbols) and for Gaussian initial conditions (open circles). The time evolution is parametrized by the value of

σ_{8}

, with the non-Gaussian results shown at

σ_{8} = 0.4

(triangles) and

σ_{8} = 1

(squares). Lines show different theoretical predictions. (b) Measurements of the third-, fourth- and fifth-order moments of the galaxy distribution in the APM Galaxy Survey, compared with the simulation results with non-Gaussian initial conditions with different bias assumptions, from the study by Gaztanaga and Mähönen in [163] (see the reference for further details).