Significant differences between Matter Power spectra of CAMB and EFTCAMB

Use of Cobaya. camb, CLASS, cosmomc, compilers, etc.
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Dournac Fabien
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Joined: May 18 2019
Affiliation: IRAP
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Significant differences between Matter Power spectra of CAMB and EFTCAMB

Post by Dournac Fabien » May 19 2022

Hi,

I have generated matter power spectra of CAMB (with C.P.L for Dark energy e.o.s and with fiducial values w0=-1 and wa=0) and EFTCAMB to compare them. For EFTCAMB, I took the option EFTflag = 3 and DesignerEFTmodel=1 ( f(R) model ).

Here the both matter power spectra ( at z=0.001) :

Image

As you can see, for large scales, they are similar but at small scales, the EFTCAMB with my options is pretty higher than CAMB version.

Is this difference normal ? What is the cause of this discrepancy ?

Any remark / suggestion / tracks are welcome.

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