[yt-users] 1D matter power spectrum

[Stephen Skory]

Geoffrey,

> This is what I get for a density threshold of zero, and I think that it 
> isn't a problem. When you set your density limit to zero, every pair of 
> points in the volume will satisfy the pair matching condition, and you're 
> really not measuring anything interesting.


I've thought a bit more about this, and I want to be clearer with my explanation. Remember that \xi is the "surplus" probability that you're measuring over a Gaussian random field of densities. If you have a "cosmological-like" Gaussian random field of densities it will have no negative or zero densities, just like a real cosmological density field. So the two fields are similar in that way, and the correlation for dens>0 will be the same for both. And this is what we both found - all zero \xis is correct for dens>0.

 
Stephen Skory
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