Non-Gaussianity from two right-handed sneutrino curvaton decays

Abstract

In this paper, we consider the effect of two right-handed sneutrino curvaton decays and investigate the parameter space. We compare the difference of the result between single- and two-curvaton cases. We find one Yukawa coupling of the right-handed snetrinos can be as large as $\lambda \sim 0.1$ while the other one is much smaller which is consistent with the idea that only one generation of the neutrino mass may be much smaller than others. When the curvatons decay, we assume both of them subdominate the energy density of the universe. We find that, unlike a single curvaton case, here a small or negative, as well as a large $f_{NL}$ can be generated.

9 pages, 6 figures, 1 table, to appear in General Relativity and Gravitation

References in corpus (4)

• Seven-Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Cosmological Interpretation
• Primordial non-Gaussianity from two curvaton decays
• Supergravity Modification of D-term Hybrid Inflation: Solving the Cosmic String and Spectral Index Problems via a Right-Handed Sneutrino
• Large non-Gaussianity generated after D-term Inflation by Right-Handed Sneutrino Curvaton

Cited by in corpus (3)

• Mixed inflaton and curvaton scenario with sneutrinos
• Sneutrinos as Mixed Inflaton and Curvaton
• Revised $f_{\mathrm{NL}}$ parameter in Curvaton Scenario