CAMB: massive neutrino equations of motion in subroutine derivs (equations.f90)

Use of Cobaya. camb, CLASS, cosmomc, compilers, etc.
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Christina Kreisch
Posts: 4
Joined: July 14 2014
Affiliation: Princeton University

CAMB: massive neutrino equations of motion in subroutine der

Post by Christina Kreisch » July 15 2014

It looks like if the neutrino is not highly non relativistic, the hierarchy for the semi-relativistic regime is immediately used even if the neutrino is highly relativistic. Then if the neutrino is highly relativistic, the hierarchy for that regime is also implemented.

Why is it that if the neutrino is highly relativistic, the hierarchies for both the highly relativistic and semi-relativistic regimes are implemented?

Thanks.

Antony Lewis
Posts: 1941
Joined: September 23 2004
Affiliation: University of Sussex
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Re: CAMB: massive neutrino equations of motion in subroutine

Post by Antony Lewis » July 16 2014

It uses one extra hierarchy (from appendix of 1201.3654) to calculate the leading correction from the mass even when the mass effect is small.

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