CAMB: Freeze growth in C_l's

Use of Cobaya. camb, CLASS, cosmomc, compilers, etc.
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Stefano Camera
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Affiliation: University of Turin
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CAMB: Freeze growth in C_l's

Post by Stefano Camera » February 21 2022

Is there a simple way to freeze the growth of structures when computing harmonic-space power spectra for number count fluctuations with pyCAMB? In other words, the standard output is
[math]
with (omitting everything but density for simplicity)
[math]
Instead, what I'd like is
[math]

Antony Lewis
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Re: CAMB: Freeze growth in C_l's

Post by Antony Lewis » February 22 2022

No (it's not well defined in general, e.g. with massive neutrinos growth is k dependent).

Stefano Camera
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Joined: February 21 2022
Affiliation: University of Turin
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Re: CAMB: Freeze growth in C_l's

Post by Stefano Camera » February 22 2022

Thanks Antony. Yes, you're right, what I wrote doesn't hold in general, but it's the same as saying
[math]
where I also allowed for scale-dependence in the bias.

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