Hi,
I was using pycamb to calculate BB power spectrum up to l~200. I set:
params.WantTensor = True
params.NonLinear =2
params.AccurateBB=1
However, I found that the shape of the power spectrum (even at low l) depends greatly on lmax. To get accurate BB, I needed to set lmax to as great as ~3000. I was wondering if there is some other setting I can use to achieve accuracy without spending too much computing power.
Thanks,
Yajing
pycamb BB power spectrum
-
- Posts: 9
- Joined: January 21 2015
- Affiliation: Johns Hopkins University
-
- Posts: 1944
- Joined: September 23 2004
- Affiliation: University of Sussex
- Contact:
Re: pycamb BB power spectrum
Yes, if you want the lensed BB accurate, which come from lensing of high-l EE and \phi\phi, you need to calculate the unlensed spectra to quite high lmax. (the non-linear corrections are also dependent on quite small scales)