Time-unit convention for the cosmological constant
= Time-unit convention for the cosmological constant
In a <Friedmann equation> written $H^2=8\pi G\rho/3+\Lambda/3-kc^2/a^2$, the symbol $\Lambda$ has units of inverse time squared. If $\Lambda_{\rm geom}$ is the geometrical constant measured in inverse length squared, $\Lambda=c^2\Lambda_{\rm geom}$. <Natural units> hide this distinction.