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Re-ionisation optical depth

Posted: November 10 2008
by Ivan Debono
Why is tau=0 not allowed?

Re-ionisation optical depth

Posted: November 11 2008
by Adam Amara
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

Re-ionisation optical depth

Posted: November 12 2008
by Ivan Debono
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.