How to calculate spatial correlation function

How do I calculate the (spatial) correlation function?
Xi(r) = (1/2(pi^2))[integral:dk k^2 P(k) (sin(kr)/kr)
What is P(k)? How do I calculate it? What is a variable and what is a constant in this equation?
thank you

Answers (0)

Asked:

on 30 Jan 2017

Edited:

on 1 Dec 2017

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