We derive the `exact' Newtonian limit of general relativity with a positive cosmological constant $\Lambda$. We point out that in contrast to the case with $\Lambda = 0 $, the presence of a positive $\Lambda$ in Einsteins's equations enforces, via the condition $| \Phi | \ll 1$, on the potential $\Phi$, a range ${ \cal R}_{ max}(\Lambda) \gg r \gg { \cal R}_{ min} (\Lambda)$, within which the Newtonian limit is valid. It also leads to the existence of a maximum mass, ${ \cal M}_{ max}(\Lambda)$. As a consequence we cannot put the boundary condition for the solution of the Poisson equation at infinity. A boundary condition suitably chosen now at a finite range will then get reflected in the solution of $\Phi$ provided the mass distribution is not spherically symmetric.
Categories: gr-qc
