Re-ionisation optical depth

Use of Healpix, camb, CLASS, cosmomc, compilers, etc.
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Ivan Debono
Posts: 25
Joined: April 17 2007
Affiliation: APC, Paris 7 / OBSPM

Re-ionisation optical depth

Post by Ivan Debono » November 10 2008

Why is tau=0 not allowed?

Adam Amara
Posts: 18
Joined: September 25 2004
Affiliation: ETH
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Re-ionisation optical depth

Post by Adam Amara » November 11 2008

Hi Ivan,

Thanks for posting this question. There's no particular reason why Tau cannot be 0. In the iCosmo package we pass the inputs that the user specifies through a set of checks (check_fiducial.pro) to make sure that nothing crazy is entered. There's a check to make sure that Tau isn't negative which I did by making sure that Tau was greater than zero. In the next update we could consider changing this criteria to be greater than or equal to zero is ok.

Thanks,

Adam

Ivan Debono
Posts: 25
Joined: April 17 2007
Affiliation: APC, Paris 7 / OBSPM

Re-ionisation optical depth

Post by Ivan Debono » November 12 2008

Thanks.

It might be useful to include a correction for sigma_8 depending on tau, to make the matter power spectrum closer to the CAMB calculation.

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