CAMB: output transferred wavenumbers
Posted: August 07 2022
Hello:
I just got a question about the outputted k modes for the matter power spectrum from CAMB. When I tested an old version of CAMB(should be before 2019) and made omch2 or ombh2 decrease by more than 0.01, the outputted number of k modes would be different from the default output in LCDM(basically a few more or less in the end), which is confusing to me because I thought the transferred k modes should be fixed as long as the relevant parameters such as kmax, minkh, and dlnkh are fixed. However, the latest version of CAMB has no such issue and will output the same k modes no matter what values of cosmological parameters to choose in params.ini. Could anyone help to explain why the old version of CAMB doesn't fix k modes but have it to change with the cosmological parameters? Since I am trying to add some modifications to the old CAMB, I'd like to know how it works and how to make the number of k modes fixed here.
Many thanks in advance.
Zhuangfei
I just got a question about the outputted k modes for the matter power spectrum from CAMB. When I tested an old version of CAMB(should be before 2019) and made omch2 or ombh2 decrease by more than 0.01, the outputted number of k modes would be different from the default output in LCDM(basically a few more or less in the end), which is confusing to me because I thought the transferred k modes should be fixed as long as the relevant parameters such as kmax, minkh, and dlnkh are fixed. However, the latest version of CAMB has no such issue and will output the same k modes no matter what values of cosmological parameters to choose in params.ini. Could anyone help to explain why the old version of CAMB doesn't fix k modes but have it to change with the cosmological parameters? Since I am trying to add some modifications to the old CAMB, I'd like to know how it works and how to make the number of k modes fixed here.
Many thanks in advance.
Zhuangfei