STATISTICS OF COSMIC MICROWAVE BACKGROUND-RADIATION WITH THE COSMIC-STRING MODEL

We have studied the cosmic microwave background radiation by simulatin g the cosmic string network induced anisotropies on the sky. The large -angular size simulations are based on the Kaiser-Stebbins effect calc ulated from full cosmic-string network simulation. The small-angular s ize simulations are done by Monte-Carlo simulation of perturbations fr om a time-discretized toy model. We use these results to find the norm alization of mu, the string mass per unit length, and compare this res ult with one needed for large-scale structure formation. We show that the cosmic string scenario is in good agreement with COBE, SK94, and M SAM94 microwave background radiation experiments with reasonable strin g network parameters. The predicted rms-temperature fluctuations for S K94 and MSAM94 experiments are Delta T/T = 1.57 x 10(-5) and Delta T/T = 1.62 x 10(-5) respectively, when the string mass density parameter is chosen to be G mu = 1.4 x 10(-6). The possibility of detecting non- Gaussian signals using the present day experiments is also discussed.