Non-Gaussianity from resonant curvaton decay
- Department of Physics, Imperial College London, London SW7 2AZ (United Kingdom)
- Institute for Theoretical Physics, University of Heidelberg, 69120 Heidelberg (Germany)
We calculate curvature perturbations in the scenario in which the curvaton field decays into another scalar field via parametric resonance. As a result of a nonlinear stage at the end of the resonance, standard perturbative calculation techniques fail in this case. Instead, we use lattice field theory simulations and the separate universe approximation to calculate the curvature perturbation as a nonlinear function of the curvaton field. For the parameters tested, the generated perturbations are highly non-Gaussian and not well approximated by the usual f{sub NL} parameterisation. Resonant decay plays an important role in the curvaton scenario and can have a substantial effect on the resulting perturbations.
- OSTI ID:
- 22272946
- Journal Information:
- Journal of Cosmology and Astroparticle Physics, Vol. 2010, Issue 01; Other Information: Country of input: International Atomic Energy Agency (IAEA); ISSN 1475-7516
- Country of Publication:
- United States
- Language:
- English
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