lira (version 1.2.0)

Hubble.LCDM: Hubble parameter

Description

Hubble parameter in a LCDM (Cold Dark Matter universe with a cosmological constant) universe in units of the present day Hubble constant.

Usage

Hubble.LCDM(z,Omega.M0=0.3,Omega.L0=0.7)

Arguments

z

the redshift

Omega.M0

present day matter density in units of the critical density in a LCDM universe.

Omega.L0

renormalized cosmological constant in units of the critical density. See 'Omega.M0'.

Value

The Hubble parameter in units of H0.

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

# NOT RUN {
# Hubbel parameter at redshit z=1 in a standard cosmology,
Hubble.LCDM(1) 
# Hubbel parameter at redshit z=1 in an open cosmology,
Hubble.LCDM(1,Omega.M0=0.2,Omega.L0=0.7)
# }