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Einstein added this '''cosmological constant''' to his field equation to make the universe stationary (neither expanding nor contracting) which it works when the '''cosmological constant''' has so called Einstein value
Einstein added this '''cosmological constant''' to his field equation to make the universe stationary (neither expanding nor contracting) which it works when the '''cosmological constant''' has so called Einstein value
:<math>\Lambda_E=4\pi G \rho/c^2</math>,
:<math>\Lambda_E=4\pi G \rho/c^2</math>,
where <math>G</math> is Newtonian gravitational constant, <math>\rho</math> is density of space, and <math>c</math> is speed of light in vacuum.
where <math>G</math> is Newtonian gravitational constant, <math>\rho</math> is density of space, and <math>c</math> is speed of light in [[vacuum]].
==Historical background==
==Historical background==