Helpsearcher

Thx for the hint; ya....I missed the more important acceleration equation. Need to have a deeper a look on those together.

Hi there, I really hope someone can help me with my stupid but urgent problem of understanding something crucial about the Friedman equations. So; one of them looks like this (forget about the constants; it is about the principles): change of the scale factor with time - density - cosmol. constant = -k (curvature term) Then this is sometimes rewritten in terms of densities, which gives: change of the scale factor with time - (density of matter + vacuum energy density) = -k (curvature term) Now; here is what I do not get. Generally the density of the vacuum (or equivalently the cosmol. constant) are treated just like the density of matter; so they have the same effect on the curvature, which somehow should be understandable as energy=matter and so both curve the spacetime. But then, it is usually stated that the cosmol. constant, and so the vacuum energy density, are working against gravitation (repulsive). However; I do not understand, how to see this in the equations above. I mean; both seem to have the same effect: energy=matter -> attraction (simplified). Where is my error of thinking? I really hope that someone here can enlighten me. Thx