lira (version 1.0)

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

# 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)