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Arxiv New Filter | Bookmarks & clubs | Arxiv ref/author:

CAMB: remove neutrino
 
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Dahee Lee



Joined: 16 Apr 2018
Posts: 8
Affiliation: Kyungpook National University

PostPosted: June 11 2018  Reply with quote

Hi.
I'm a little confused about massless neutrino.
I set the neutrino parameter like this:

omnuh2 = 0.000
massless_neutrinos = 0.0
nu_mass_eigenstates = 0
massive_neutrinos = 0.
share_delta_neff = F
nu_mass_fractions = 0.
nu_mass_degeneracies = 0.

because I want to remove massless and massive neutrinos.
and I checked that massive neutrino's value is zero.
But massless is not.
Although I check that 'CP%Num_Nu_massless' is zero, but for density perturbation and Delta_r/k2 in transfer.dat output file, massless neutrino has non-zero value.
How can I remove all neutrinos?
Or are massless neutrinos always calculated?

Any help would be appreciated.
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Antony Lewis



Joined: 23 Sep 2004
Posts: 1350
Affiliation: University of Sussex

PostPosted: June 11 2018  Reply with quote

The neutrino transfer function may still be calculated even if the actual energy density in neutrinos is zero.
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Dahee Lee



Joined: 16 Apr 2018
Posts: 8
Affiliation: Kyungpook National University

PostPosted: June 11 2018  Reply with quote

Thank you for your replying.

I understood that massless neutrino is calculated even if 'massless_neutrinos' parameter is zero.
Then, is my parameter setting right for removing all neutrinos?
Sorry for my trivial questions.
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Antony Lewis



Joined: 23 Sep 2004
Posts: 1350
Affiliation: University of Sussex

PostPosted: June 12 2018  Reply with quote

It looks right, but I haven't tested it.
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