So if the DESI preference for evolving DE is robust, further evidence for it could come in the form of a modified growth history, which would show up as a flattening of fsigma8(z)

We don’t really need the contour as a function of parameters but only need the chi^2 value that corresponds to that contour. So that’s what we calculate here, the chi^2 value where 95% of the chi^2 values are better than it.

Rather than plot the posterior in terms of parameters, I like plotting the posterior in terms of functions, to really see what the model is doing and what’s really going on with the data.

This is also the most observational work I’ve done where I’m publishing data from the JWST, as well as constraints on DM physics from data; really doing that full-stack cosmology as I like to say

Here, we calculate constraints on the free streaming length of dark matter (aka the mass of a thermally produced DM particle) and find dark matter must be heavier than 6.1 keV