Comological constant follows Newton's third law of motion?

Question

To every cosmological constant there is an equal and opposite constant.

Answer 1

The cosmological constant is a somewhat arbitrary number assigned to some of the relativity equations. In a very real sense, Einstein put the constant into his equations to "make things come out right." [See source.]

As a constant proportional to the energy density of the universal vacuum ρvac, it follows no laws...it's just a number with 1/m^2 units. What makes it interesting is that the shape of the universe is mathematically derived depending on what value is given to the normalized version of the constant.

There are three possible shapes of the universe: flat like a pancake (G ~ 1), spherical (G > 1), or saddle shaped (G < 1); where G is the normalized cosmological constant. Not too long ago, the consensus was that the universe was spherical, but now many, if not most, believe the universe is flat. [See source.]