Non-Gaussianity in the curvaton scenario

By N. Bartolo, S. Matarrese, A. Riotto. 2003

232 citations recorded by the source corpus.

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 adiabatic perturbations, we study the evolution of the second-order cosmological curvature perturbation on superhorizon scales in the curvaton scenario. We provide the exact expression for the non-Gaussianity in the primordial perturbations including gravitational second-order corrections which are particularly relevant in the case in which the curvaton dominates the energy density before it decays. As a by-product, we show that in the standard scenario where cosmological curvature perturbations are induced by the inflaton field, the second-order curvature perturbation is conserved even during the reheating stage after inflation.

Subfields: Astronomy and Astrophysics, Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/c0176855fad03cddd5d1fc69a3b39f4fc4a39ee5

How researchers see this paper

The researchers whose trusted networks rank it highest, strongest advocate first. Every researcher gets a different order.

In Astronomy and Astrophysics

1. Xingang Chen
2. C. Byrnes
3. A. Banday
4. M. Zaldarriaga
5. Kiwoon Choi
6. L. Senatore
7. H. Eriksen
8. M. Liguori

In Nuclear and High Energy Physics

1. C. Byrnes
2. Kiwoon Choi
3. L. Senatore
4. M. Zaldarriaga
5. Xingang Chen
6. A. Banday
7. H. Eriksen
8. E. di Valentino

Citations in the corpus

• Review of local non-Gaussianity from multi-field inflation (2010, methodology): “[31] with a sudden decay approximation and also by Malik and lyth [32] using a fully numeric approach, which accounted for both the sudden decay and nonsudden decay approximations.”
• Primordial Non-Gaussianity and Bispectrum Measurements in the Cosmic Microwave Background and Large-Scale Structure (2010, background): “NL ≈ O(100) (Bartolo et al., 2004b; Linde & Mukhanov, 2006; Lyth et al., 2003).”
• Non-Gaussianity in curvaton models with nearly quadratic potentials (2005, background): “ a pronounced effect on the level of non-Gaussianity. In particular, the limit |f NL| ≪ 1 is allowed even with small curvaton energy densities r≪ 1. This is in sharp contrast with the quadratic result [8, 11] and shows that the curvaton models are not ruled out by a possible non-detection of non-Gaus”