Is there any way to change the accuracy of just one new equation in CAMB?

Use of Cobaya. camb, CLASS, cosmomc, compilers, etc.
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Jiwon Park
Posts: 9
Joined: July 09 2019
Affiliation: Soongsil University

Is there any way to change the accuracy of just one new equation in CAMB?

Post by Jiwon Park » May 30 2022

Dear all,

I'm trying to implement a new field equation in CAMB. But due to the extraordinary feature of the field, it shows an unnecessary small oscillation as it evolves.
However, what I need is just the overall amplitude of the field and not the tiny fluctuation, which only results in a significantly slower code. So I want to set a different precision for the equation solver only for my specific field. So, Is there any way to do this?
As far as I understand the code, it seems that the solver allocates the same accuracy parameter for all species simultaneously.
If you could help with this issue, I would appreciate it.

Jiwon Park

Antony Lewis
Posts: 1812
Joined: September 23 2004
Affiliation: University of Sussex
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Re: Is there any way to change the accuracy of just one new equation in CAMB?

Post by Antony Lewis » May 31 2022

No, the solver is adaptive. Probably best to derive an analytic approximation equation for the amplitude if that's what you want.

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