## CLASS code : same values for matter power spectrum between non-linear model and linear model

Use of Cobaya. camb, CLASS, cosmomc, compilers, etc.
Dournac Fabien
Posts: 72
Joined: May 18 2019
Affiliation: IRAP
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### CLASS code : same values for matter power spectrum between non-linear model and linear model

Hello,

by a direct execution " \$ ./class params.ini " , I need to generate matter power spectrum with CLASS code, both with linear mode and non-linear mode.

The issue is that I get the same values between both models.

For linear, I have left in params.ini :

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non_linear =
I have set for non-linear :

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non_linear = halofit
and also tried with :

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non_linear = hmcode
Is there a way to get a larger difference between linear and non-linear (halofit or hmcode) for matter power spectra ?

Regards