Real-Space vs Redshift-Space Correlation Functions

srivatsan
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I would like to know what is the difference between real-space correlation and redshift-space correlation functions?
 
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I've never heard of "redshift-space". What is that exactly?
 
our “third dimension” in cosmology
is not radial distance but redshift. The two are related
by the Hubble expansion but also affected by peculiar velocities. This is called as redshift-space. Due to the peculiar velocities of galaxies, there are objects that appear stretched towards us..
 
Ah ok. So it's pretty much where the effects of cosmological expansion start to become noticeable then?
 

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