Would the cosmological constant remain the even without any matter in the Universe?

The answer depends on whether or not you believe the theory of General Relativity and the widely accepted view that there is dark energy in the Universe. If you do, then the cosmological constant should still be there. However, if you prefer a different theory, it would depend on the details of that theory as to whether there would even be a cosmological constant with the presence of matter in the Universe.

I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.