2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/33924This is just to point out that the Nariai metric is the first example of the singularity free expanding perfect fluid cosmological model satisfying the weak energy condition, $ρ>0, ρ+p=0$. It is a conformally non-flat Einstein space.LaTeX, 3 pagesGeneral Relativity and Quantum CosmologyAstrophysicsHigh Energy Physics - Theorytext