FlatwCDM

class astropy.cosmology.core.FlatwCDM(H0, Om0, w0=-1.0, Tcmb0=2.725, Neff=3.04, name='FlatwCDM') [edit on github][source]

Bases: astropy.cosmology.core.wCDM

FLRW cosmology with a constant dark energy equation of state and no spatial curvature.

This has one additional attribute beyond those of FLRW.

Examples

>>> from astro.cosmology import FlatwCDM
>>> cosmo = FlatwCDM(H0=70, Om0=0.3, w0=-0.9)

The comoving distance in Mpc at redshift z:

>>> dc = cosmo.comoving_distance(z)

Methods Summary

efunc(z) Function used to calculate H(z), the Hubble parameter.
inv_efunc(z) Function used to calculate \frac{1}{H_z}.

Methods Documentation

efunc(z) [edit on github][source]

Function used to calculate H(z), the Hubble parameter.

Parameters :

z : array_like

Input redshifts.

Returns :

E : ndarray, or float if input scalar

The redshift scaling of the Hubble consant.

Notes

The return value, E, is defined such that H(z) = H_0 E.

inv_efunc(z) [edit on github][source]

Function used to calculate \frac{1}{H_z}.

Parameters :

z : array_like

Input redshifts.

Returns :

E : ndarray, or float if input scalar

The inverse redshift scaling of the Hubble constant.

Notes

The return value, E, is defined such that H_z = H_0 / E.

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