cosmology - Can the Universe be spatially closed and expand forever?

Yes, if the Universe is matter-dominated and spatially closed, then a cosmological constant:

$Lambda > frac{4pi G rho}{c^2}$

Where $rho$ is the critical energy density (of matter) of the Universe, will cause it to expand forever.

NB Where $Lambda$ is equal to this value you get the (unstable) Einstein static Universe.

• Next What is the cost and benefit of building two identical telescopes?
• Previous orbit - Average amount of annual daylight at any place on earth