2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/125468Perfect-fluid, static, cylindrically symmetric solutions of Einstein's field equations are obtained for the equations of state $ρ+3p=0$ and $ρ=p$. In the former case, the density and the pressure turn out to be constant while in the later case, they depend on the radial parameter $r$. Evan's solution corresponding to the equation of state $ρ=p$ is included in the solutions discussed here.5 pages, LaTexGeneral Relativity and Quantum Cosmologytext