I am looking for a exact derivation of a relation between redshift z and distance d.
What I know is the definition z=λobservedλunshifted−1=√1+vc1−vc−1
and that the Hubble constant H as a function of z is: H2=H20(Ωm(1+z)3+ΩΛ)
How can I use this to derive the distance?
Answer
Depending on the shape of the universe the luminosity distance is given by :
dL(z)={(1+z)cH0√|Ωk|sin[√|Ωk|∫z0dz′H(z′)/H0]for k=1(1+z)cH0∫z0dz′H(z′)/H0for k=0(1+z)cH0√|Ωk|sinh[√|Ωk|∫z0dz′H(z′)/H0]for k=−1
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