Nothing
lookback = function(z = 1, H = 70, M = 0.3, L = 1-M, K = 1-M-L, units = "Gyr"){
# Lookback time, tL
# redshift, hubble constant (km/s/Mpc), DM, DE, curvature, output units (s or Gyr)
# FROM: Hogg, 2000
H = (3.24077649E-20)*H
tH = 1/H
E2 = function(a){ ((1+a)^-1.0)*(((M*(1+a)^3) + (K*(1+a)^2) + L)^-0.5) }
tL = tH*Vectorize(function(z){integrate(E2, lower=0, upper=z)$value})(z)
if(units=="Gyr"){
mfact=3.16887646E-17
}else{
mfact=1
}
return(mfact*tL)
}
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