<i>f</i>(<i>R</i>) cosmology from Noether’s symmetry

A general approach to find out exact cosmological solutions in f(R)-gravity\nis discussed. Instead of taking into account phenomenological models, we\nassume, as a physical criterium, the existence of Noether symmetries in the\ncosmological f(R) Lagrangian. As a result, the presence of such symmetries\nselects viable models and allow to solve the equations of motion. We discuss\nalso the case in which no Noether charge is present but general criteria can be\nused to achieve solutions.\n Comment: 23 pages, uses RevTeX

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