CAMB: output matter power specturm

Use of Cobaya. camb, CLASS, cosmomc, compilers, etc.
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Zhuangfei Wang
Posts: 13
Joined: October 09 2021
Affiliation: Simon Fraser University

CAMB: output matter power specturm

Post by Zhuangfei Wang » September 13 2022

Hello:

I just have a question on how to output P_vv, P_dv power spectra from CAMB. The default case could only do P_dd. Thanks.

Antony Lewis
Posts: 1812
Joined: September 23 2004
Affiliation: University of Sussex
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Re: CAMB: output matter power specturm

Post by Antony Lewis » September 14 2022

Using the python interface is probably easiest.

Zhuangfei Wang
Posts: 13
Joined: October 09 2021
Affiliation: Simon Fraser University

Re: CAMB: output matter power specturm

Post by Zhuangfei Wang » September 15 2022

Thanks, Antony. Just one further question on this. I noticed that the transferred velocity variables are normalized by -k/H, e.g. -k*sigma/adotoa for Transfer_Newt_vel_cdm. Is there a specific reason why it has to be done in this way? Also, if I want to output the actual velocity power spectrum, do I need to remove this normalization factor from the source?Thanks a lot

Antony Lewis
Posts: 1812
Joined: September 23 2004
Affiliation: University of Sussex
Contact:

Re: CAMB: output matter power specturm

Post by Antony Lewis » September 15 2022

k/H default units are historical. The normalization makes it scale like the density, and most relevant for redshift distortions.

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