dVdtau

zdm.cosmology.dVdtau(z)

Time-weighted comoving volume element per unit redshift per steradian.

Similar to dV(z) but includes an extra (1+z)^-1 factor to account for cosmological time dilation when converting between source-frame and observer-frame event rates.

Parameters:

z (float) – Redshift.

Returns:

Time-weighted volume element in Mpc^3 per unit redshift per steradian.

Return type:

float