2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/196909The general solution of the gravitational field equations for a full causal bulk viscous stiff cosmological fluid, with bulk viscosity coefficient proportional to the energy density to the power 1/4, is obtained in the flat Friedmann-Robertson-Walker geometry. The solution describes a non-inflationary Universe, which starts its evolution from a singular state. The time variation of the scale factor, deceleration parameter, viscous pressure, viscous pressure-thermodynamic pressure ratio, comoving entropy and Ricci and Kretschmann invariants is considered in detail.6 pages, 6 figures, to appear in Int. J. Mod. Phys. DGeneral Relativity and Quantum Cosmologytext