Nflation: observable predictions from the random matrix mass spectrum

Understand

We carry out numerical investigations of the perturbations in Nflation models where the mass spectrum is generated by random matrix theory.

• The tensor-to-scalar ratio and non-gaussianity are already known to take the single-field values, and so the density perturbation spectral index is the main parameter of interest.
• We study several types of random field initial conditions, and compute the spectral index as a function of mass spectrum parameters.
• Comparison with microwave anisotropy data from the Wilkinson Microwave Anisotropy Probe shows that the model is currently viable in the majority of its parameter space.