Cosmic Microwave Background Anisotropies from Scaling Seeds: Fit to Observational Data

We compute cosmic microwave background angular power spectra for scaling seed models of structure formation. A generic parametrization of the energy momentum tensor of the seeds is employed. We concentrate on two regions of parameter space inspired by global topological defects: $O\left(4\right)$ texture models and the large- $N$ limit of $O\left(N\right)$ models. We use ${\chi }^2$ fitting to compare these models to recent flat-band power measurements of the cosmic microwave background. Only scalar perturbations are considered.