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Non-Gaussianity from resonant curvaton decay

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arxiv 0909.4535 v3 pith:RS72T2EE submitted 2009-09-24 astro-ph.CO hep-phhep-th

Alex Chambers , Sami Nurmi , Arttu Rajantie This is my paper · ORCID
classification astro-ph.COhep-phhep-th
keywords curvatonfieldperturbationscalculatecurvaturedecaynonlinearresonance
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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 fNL parameterisation. Resonant decay plays an important role in the curvaton scenario and can have a substantial effect on the resulting perturbations.

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Cited by 3 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. Memoirs of the curvaton: non-perturbative non-Gaussianity and supermassive primordial black holes

    astro-ph.CO 2026-06 unverdicted novelty 6.0 of 10

    Curvaton self-interactions in non-quadratic potentials produce a local non-Gaussian map that enables supermassive primordial black hole formation at peak amplitudes of order 10^{-5} while remaining consistent with μ-d...

  2. Curvature perturbations from vacuum transition during inflation

    astro-ph.CO 2025-02 conditional novelty 5.0 of 10

    Vacuum transitions during inflation, modulated by a light spectator field, can generate curvature perturbations with non-Gaussianity fNL ~ O(10) in a Higgs inflation setup.

  3. Curvaton distribution from stochastic inflation

    astro-ph.CO 2024-11 conditional novelty 5.0 of 10

    Closed-form probability distributions for the curvature perturbation are derived for four exactly solvable curvaton potentials, and the mass-decay-rate parameter space is split into regions by the probability of produ...

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