Non-Gaussianity from resonant curvaton decay

@article{Chambers2009NonGaussianityFR,
  title={Non-Gaussianity from resonant curvaton decay},
  author={A. Chambers and S. Nurmi and A. Rajantie},
  journal={arXiv: Cosmology and Nongalactic Astrophysics},
  year={2009}
}
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… Expand

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References

SHOWING 1-10 OF 89 REFERENCES
A numerical study of non-gaussianity in the curvaton scenario
We study the curvaton scenario using gauge-invariant second order perturbation theory and solving the governing equations numerically. Focusing on large scales we calculate the non-linearityExpand
Non-Gaussianity in the curvaton scenario
Since a positive future detection of nonlinearity in the cosmic microwave background anisotropy pattern might allow us to descriminate among different mechanisms giving rise to cosmological adiabaticExpand
Non-Gaussianity in curvaton models with nearly quadratic potentials
We consider curvaton models with potentials that depart slightly from the quadratic form. We show that although such a small departure does not significantly modify the Gaussian part of the curvatureExpand
Parametric decay of the curvaton
We argue that the curvaton decay takes place most naturally by way of a broad parametric resonance. The mechanism is analogous to resonant inflaton decay but does not require any tuning of theExpand
Non-Gaussianity and constraints for the variance of perturbations in the curvaton model
Recently, the primordial non-Gaussianity in the curvaton model has been predicted assuming sudden decay of the curvaton. We extend the calculation to non-instantaneous decay by employing delta NExpand
Generating the curvature perturbation without an inflaton
We present a mechanism for the origin of the large-scale curvature perturbation in our Universe by the late decay of a massive scalar field, the curvaton. The curvaton is light during a period ofExpand
Lattice calculation of non-Gaussianity from preheating
If light scalar fields are present at the end of inflation, their non-equilibrium dynamics such as parametric resonance or a phase transition can produce non-Gaussian density perturbations. We showExpand
Curvaton Dynamics
In contrast to the inflaton's case, the curvature perturbations due to the curvaton field depend strongly on the evolution of the curvaton before its decay. We study in detail the dynamics of theExpand
Non-Gaussianity of the primordial perturbation in the curvaton model
We use the {delta}N formalism to investigate the non-Gaussianity of the primordial curvature perturbation in the curvaton scenario for the origin of structure. We numerically calculate the fullExpand
Primordial non-Gaussianity from two curvaton decays
We study a model where two scalar fields, that are subdominant during inflation, decay into radiation some time after inflation has ended but before primordial nucleosynthesis. Perturbations of theseExpand
...
1
2
3
4
5
...