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A general class of nonlocal cosmological models is considered. A new methodfor solving nonlocal Friedmann equations is proposed, and solutions of theFriedmann equations with nonlocal operator are presented. The cosmologicalproperties of these solutions are discussed. Especially indicated is $p$-adiccosmological model in which we have obtained nonsingular bouncing solution andstring field theory tachyon model in which we have obtained full solution ofnonlocal Friedmann equations with $w=-1$ at large times. The possibility ofobtaining realistic value of cosmological constant from nonlocal cosmologicalmodels is also discussed.

Dynamics in Nonlocal Cosmological Models Derived from String Field Theory