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Fix ujl discontinuity in near-flat models (conservative approach) #185

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cmbant merged 1 commit into from
Sep 15, 2025
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Fix ujl discontinuity in near-flat models (conservative approach) #185

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3 changes: 2 additions & 1 deletion fortran/cmbmain.f90
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Original file line number Diff line number Diff line change
Expand Up @@ -1693,7 +1693,8 @@ subroutine IntegrateSourcesBessels(IV,ThisCT,j,l,nu)
if (ThisSources%SourceNum > 3) call MpiStop('Non-flat not implemented for extra sources')
!Integrate chi down in dissipative region
! cuts off when ujl gets small
miny1= 0.5d-4/l/BessIntBoost
! Fix for ujl discontinuity in near-flat models - adaptive formula provides superior performance
miny1= 0.5d-4/(l+max(0,30-l))/BessIntBoost ! Adaptive formula for Omega_k discontinuity fix, see https://github.com/cmbant/CAMB/pull/185
sums=0
qmax_int= max(850,ThisCT%ls%l(j))*3*BessIntBoost/(State%chi0*State%curvature_radius)*1.2
DoInt = ThisSources%SourceNum/=3 .or. IV%q < qmax_int
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