#### Arman777

Gold Member

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I don't know GR so while answering the question if you prefer not to use that, I would be happy.

In the Friedmann Equations, is energy density has an effect on curvature or vice versa?

Or they are separate things and they don't affect each other?

For example can we have an energy density ##\rho_0## such that its less then a critical density ##\rho_c\,,\,\,(\rho_0<\rho_c)## in a positive curvature universe ?

Or a hyperbolic universe with ##\rho_0>\rho_c##. In general, it seems it should affect, but I couldn't be sure.

In the Friedmann Equations, is energy density has an effect on curvature or vice versa?

Or they are separate things and they don't affect each other?

For example can we have an energy density ##\rho_0## such that its less then a critical density ##\rho_c\,,\,\,(\rho_0<\rho_c)## in a positive curvature universe ?

Or a hyperbolic universe with ##\rho_0>\rho_c##. In general, it seems it should affect, but I couldn't be sure.

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