distance.LCDM {lira}

Angular diameter distance in a LCDM universe

Description

Angular diameter distance in a LCDM (Cold Dark Matter universe with a cosmological constant) universe between an observer at 'zd' and a source at 'zs'. The distance is in units of the Hubble distance c/H0, where 'c' is the speed of light and 'H0' is the Hubble constant.

Usage

distance.LCDM(zo=0.0,z,Omega.M0=0.3,Omega.L0=0.7)

Arguments

zo

redshift of the observer.

z

redshift of the source.

Omega.M0

present day matter density in units of the critical density.

Omega.L0

renormalized cosmological constant in units of the critical density.

Value

The estimate of the distance.

Author(s)

Mauro Sereno [e-mail]

References

Sereno M., Covone G., Piedipalumbo E., de Ritis R., (2001) Monthly Notices of the Royal Astronomical Society 327, 517-530.

See Also

See also Hubble.LCDM.

Examples

# Distance to a source at z=1 in a standard cosmology,
distance.LCDM(z=1.0) 
# Distance between a lens at zl=0.3 and a source at z=1 in an open cosmology,
distance.LCDM(0.3,1,Omega.M0=0.2,Omega.L0=0.7)