Primordial gravitaional potential power spectrum from CAMB

Use of Cobaya. camb, CLASS, cosmomc, compilers, etc.
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Dionysis Karagiannis
Posts: 3
Joined: November 07 2013
Affiliation: Durhan University

Primordial gravitaional potential power spectrum from CAMB

Post by Dionysis Karagiannis » May 02 2014

Hi everyone,

I want to derive P_{\phi} from camb. How can I get P_{\phi}? What is the exact output of the camb matter power spectrum? Is it P_{k} or k^3*P_{k}/(2*\pi^2)? Does it includes T(k)^2 in the matter power spectrum output? The camb transfer function output is not normalised to give T(0)=1 right? Thank you very much for the help and time.

Antony Lewis
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Joined: September 23 2004
Affiliation: University of Sussex
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Re: Primordial gravitaional potential power spectrum from CA

Post by Antony Lewis » May 03 2014

it is the standard P_k in h^{-1}Mpc units.

Dionysis Karagiannis
Posts: 3
Joined: November 07 2013
Affiliation: Durhan University

Primordial gravitaional potential power spectrum from CAMB

Post by Dionysis Karagiannis » May 03 2014

Thank you Anthony for your reply. Just a clarification, when you mean the standard P_{k} you mean: P_{k}=A_{s}(k/k_{pivot})^{n_{s}}T(k)^2,
where A_{s} is the scalar amplitude defined in the params.ini document and T(k) is the transfer function in the transfer_output file right? Thanks again for your help.

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