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

non expected discrepancy between CMB curves
 
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ivan rodriguez-montoya



Joined: 21 Mar 2009
Posts: 7
Affiliation: Cinvestav
PostPosted: July 29 2010  Reply with quote
Hi everybody

Default parameters in CAMB include 'massive_neutrinos = 0' and consequently 'omnuh2 = 0' from which CMB spectrum fits pretty well WMAP data. you can check my params.ini

I just changed 'massive_neutrinos = 3', but mantain 'omnuh2 = 0', which should mean effectively massless neutrinos. I was expecting to obtain a very similar CMB spectrum, but am surprised to find that the change is quite significative. You can see it neu.eps. It has nothing to do with 'massive_nu_approx' parameter

Why do they differ that much?

Maybe naively, this could seem to be an inconsistency. I would appreciate your comments. Thanks
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Antony Lewis



Joined: 23 Sep 2004
Posts: 512
Affiliation: University of Sussex
PostPosted: July 29 2010  Reply with quote
What did you set for massless_neutrinos ?
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