I am running chains with the CPL parametrization w(z)=w0+wa*(1-a).

However, I am thinking of this parametrization in the context of quintessence (scalar field) dark energy models which mean w(z)>−1 for all z, which translates to w0+wa>−1. I want to impose this condition as a hard prior.

In

**CosmologyParametrizations.f90**, within the function

**TP_NonBaseParameterPriors**, I wrote the following:

Code: Select allp>

`if (CMB%wa + CMB%w < −1.0) return`

^{30}(i.e. a very high chi

^{2}) if w0+wa<−1

However, I noticed that my chains are still accepting points with w0+wa<−1 (not much smaller than −1, like −1.02 or so, but nonetheless the hard prior should cut these points out). Do you have any idea if and where my mistake is? The above is the only change I made in the source folder.

Thanks a lot! Cheers,

Sunny