TEXTURE-INDUCED MICROWAVE BACKGROUND ANISOTROPIES

We use numerical simulations to calculate the cosmic microwave backgro und anisotropy induced by the evolution of a global texture field, wit h special emphasis on individual textures. Both spherically symmetric and general configurations are analyzed, and in the latter case we con sider field configurations which exhibit unwinding events and also one s which do not. We compare the results given by evolving the field num erically under both the expanded core (XCORE) and nonlinear sigma mode l (NLSM) approximations with the analytic predictions of the NLSM exac t solution for a spherically symmetric self-similar (SSSS) unwinding. We find that the random unwinding configuration spots' typical peak he ight is 60-75% and angular size typically only 10% of those of the SSS S unwinding, and that random configurations without an unwinding event nonetheless may generate indistinguishable hot and cold spots. A brie f comparison is made with other work.