Cosmic microwave background anisotropy from wiggly strings - art. no. 083504.

We investigate the effect of wiggly cosmic strings on the cosmic microwave background radiation anisotropy and matter power spectrum by modifying the string network model used by Albrecht et al. We employ the wiggly equation of state for strings and the one-scale model for the cosmological evolution of certain network characteristics. Fdr the same choice of simulation para meters we compare the results with and without including wiggliness in the model and find that wiggliness together with the accompanying low string ve locities leads to a significant peak in the microwave background anistropy and to an enhancement in the matter power spectrum. For the cosmologies we have investigated (standard CDM and CDM plus a cosmological constant), and within the limitations of our modeling of the string network, the anisotrop y is in reasonable agreement with current observations but the COBE normali zed amplitude of density perturbations is lower than what the data suggest. In the case of a cosmological constant and CDM model, a bias factor of abo ut 2 is required. [50556-2821(99)05518-6].