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

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Preguntada:

el 30 de En. de 2017

Editada:

el 1 de Dic. de 2017

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