Has anyone ever carried out a direct comparison of CMBeasy and CAMB matter power spectra? Should they agree perfectly?
Thanks
CAMB vs CMBeasy
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- Posts: 5
- Joined: May 23 2006
- Affiliation: University of Heidelberg
CAMB vs CMBeasy
Cmbeasy (since v4.0) uses the same normalization as CAMB, so the spectra should be the same. However, be aware that if you use one of the standard *Invariant gauges, what is plotted is actually the gauge invariant [tex]D_g[/tex], so they will differ on very large scales. (See also the discussion here at http://cosmocoffee.info/viewtopic.php?t ... ph+0503277 .)
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- Posts: 25
- Joined: April 17 2007
- Affiliation: APC, Paris 7 / OBSPM
CAMB vs CMBeasy
Thanks.
I'm actually getting two curves which are slightly offset, especially on large scales, and as far as I can see, I'm using the same cosmological parameters.
Here are the two graphs:
http://sacha.hony.free.fr/fromivan/CMBeasy_vs_camb.pdf
I'm actually getting two curves which are slightly offset, especially on large scales, and as far as I can see, I'm using the same cosmological parameters.
Here are the two graphs:
http://sacha.hony.free.fr/fromivan/CMBeasy_vs_camb.pdf