•
•and
hence
•
•
•
•In a
homogeneous model the conservation equation yields the
•Chaplygin
gas density as a function of the scale factor a
•
•
•
•
•where B is an integration constant.The Chaplygin gas thus
interpolates
•between
dust (ρ~a -3 ) at large redshifts and a cosmological constant
•(ρ~ A½) today and hence yields a correct homogeneous
cosmology
•
•