Real-Space vs Redshift-Space Correlation Functions

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    Correlation Functions
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Discussion Overview

The discussion focuses on the differences between real-space correlation functions and redshift-space correlation functions in cosmology. It explores the implications of redshift as a dimension and how peculiar velocities affect observations.

Discussion Character

  • Exploratory, Conceptual clarification

Main Points Raised

  • One participant seeks clarification on the differences between real-space and redshift-space correlation functions.
  • Another participant expresses unfamiliarity with the term "redshift-space" and requests an explanation.
  • A participant explains that in cosmology, redshift serves as a third dimension related to radial distance, influenced by Hubble expansion and peculiar velocities.
  • It is suggested that redshift-space effects become significant due to cosmological expansion and peculiar velocities, leading to observable stretching of galaxies.

Areas of Agreement / Disagreement

Participants have not reached a consensus, and multiple viewpoints regarding the implications and definitions of redshift-space remain. The discussion is still open and exploratory.

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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