CAMB: GR correction?

Use of Cobaya. camb, CLASS, cosmomc, compilers, etc.
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Minseong Kwon
Posts: 2
Joined: April 24 2024
Affiliation: Seoul National University

CAMB: GR correction?

Post by Minseong Kwon »

Hi,

I'm trying to calculate the GR correction for an N-body simulation as defined below.

[math]
(https://arxiv.org/pdf/1811.00904.pdf)

Is there a general routine to calculate such a quantity in the CAMB code?

Thanks for any help!
Minseong
Antony Lewis
Posts: 1961
Joined: September 23 2004
Affiliation: University of Sussex
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Re: CAMB: GR correction?

Post by Antony Lewis »

It's not pre-coded. You can use the tools of
https://camb.readthedocs.io/en/latest/ScalEqs.html
to relate to CAMB synchornous-gauge variables, e.g. I think you basically want A(t) (acceleration) in the gauge in which h(t)=0 (perturbation to scale factor), and subtract the acceleration you get from the Poisson equation.
Minseong Kwon
Posts: 2
Joined: April 24 2024
Affiliation: Seoul National University

Re: CAMB: GR correction?

Post by Minseong Kwon »

I appreciate your help!
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