Anisotropies in the cosmic microwave background radiation due to the gravitational waves are studied. We investigated the propagation of a spectrum of the gravitational waves induced during inflation epoch, in a Friedmann background of a Hot and Cold Dark Matter, radiation and a cosmological constant (the role of baryons is neglected). Finally, the imprint of the gravitational waves as anisotropies of the CMB are calculated. The influence of massless collisionless particles, which can source the gravitational waves by their anysotropic stress, is investigated. The general MDM models with and without cosmological constant are considered. For a given, scale invariant input spectrum of the gravitational waves, the dependence of resulting spectrum of CMB anisotropies on the different models parameters is determined.
Joint European and National Astronomical Meeting
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