astropy:docs

scale_factor

astropy.cosmology.funcs.scale_factor(z, cosmo=None)[source] [edit on github]

Scale factor at redshift z.

The scale factor is defined as a = 1 / (1 + z).

Parameters:

z : array_like

Input redshifts.

Returns:

scalefac : ndarray, or float if input scalar

Scale factor at each input redshift.

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