RESONANT DECAY OF COSMOLOGICAL BOSE CONDENSATES

We present results of fully nonlinear calculations of decay of the inf laton interacting with another scalar field X. Combining numerical res ults for a cosmologically interesting range of the resonance parameter , q less than or equal to 10(6), with analytical estimates, we extrapo late them to larger q. We find that scattering of X fluctuations off t he Bose condensate is a very efficient mechanism limiting growth of X fluctuations. For a single-component X, the resulting variance, at lar ge q, is much smaller than that obtained in the Hartree approximation.