general relativity

cosmological constant

neutron stars

perfect fluid

cosmological models

spherically symmetric

Physical review

In Newtonian theory, gravity inside a constant density static sphere is independent of spacetime dimension. Interestingly this general result is also carried over to Einsteinian as well as higher order Einstein-Gauss-Bonnet (Lovelock) gravity notwithstanding their nonlinearity. We prove that the necessary and sufficient condition for universality of the Schwarzschild interior solution describing a uniform density sphere for all $n\ensuremath{\ge}4$ is that its density is constant.

Uniform density static fluid sphere in Einstein-Gauss-Bonnet gravity and its universality