I am trying to understand the exact expression for the window function used in CAMB Sources to calculate the convergence power spectrum for weak lensing. The subroutine output contains the following expression for a weak lensing source:
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sources(3+w_ix) =-2*phi*W%win_lens(j)
I am wondering if anyone knows the expression for W%win_lens(j)? I understand that it is calculated from awin_lens in the subroutine inithermo, but I am having trouble understanding this calculation. It doesn't seem to me as though it produces either a simple Gaussian in redshift or the standard lensing kernel g.
Thanks very much for any help!
Danielle Leonard