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There are some universe models where ##\Lambda < 0##. In this case, the energy density of the dark-energy becomes negative. At this point, does it make sense to talk about "negative dark energy density"? Or is it possible to think of this energy as curvature on space-time? Such that, ##\Lambda < 0## will imply a negative curvature and ##\Lambda > 0## positive one.
For instance if we have a only matter with ##\Omega_m = 0.3## the universe will have negative curvature with ##\Omega_{\kappa} = 0.7##.
When we add positive dark energy such that ##\Omega_{\Lambda} = 0.7## we would have ##\Omega_{\kappa} = 0##.
If we add negative dark energy such that ##\Omega_{\Lambda} = -0.7##, we would have ##\Omega_{\kappa} = 1.4##
So adding positive energy density increases the curvature.
In other words is there a something call "negative" energy density ? or
Does all negative energy densities are thought in terms of the curvature effects on space-time?
For instance if we have a only matter with ##\Omega_m = 0.3## the universe will have negative curvature with ##\Omega_{\kappa} = 0.7##.
When we add positive dark energy such that ##\Omega_{\Lambda} = 0.7## we would have ##\Omega_{\kappa} = 0##.
If we add negative dark energy such that ##\Omega_{\Lambda} = -0.7##, we would have ##\Omega_{\kappa} = 1.4##
So adding positive energy density increases the curvature.
In other words is there a something call "negative" energy density ? or
Does all negative energy densities are thought in terms of the curvature effects on space-time?
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