Passive Curvaton

Abstract

We propose a class of curvaton models which we call passive curvaton. In this paper, two kinds of passive curvaton is considered. The first one is a pseudoscalar curvaton couples to a gauge field. Different from the inflaton case, the constraint from formation of primordial black holes (PBHs) is much weaker and large non-gaussianity (of the equiliteral type) can be produced. The second model is a dilaton-like scalar curvaton couples to a gauge field. We investigate the scale dependence of non-gaussianity in this model. In both models, the spectrum and non-Gaussianity are enhanced by the slow-roll parameter of the curvaton field. Other possible passive curvaton models are also mentioned.

9 pages, 2 figures, to appear in PLB

References in corpus (15)

• Seven-Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Cosmological Interpretation
• The inflationary prediction for primordial non-gaussianity
• Large Nongaussianity in Axion Inflation
• Naturally inflating on steep potentials through electromagnetic dissipation
• Phenomenology of a Pseudo-Scalar Inflaton: Naturally Large Nongaussianity
• Observable non-gaussianity from gauge field production in slow roll inflation, and a challenging connection with magnetogenesis
• Trapped Inflation
• Cosmological Fluctuations from Infra-Red Cascading During Inflation
• First constraints on the running of non-Gaussianity
• The inflating curvaton
• Possible Constraints on the Duration of Inflationary Expansion from Quantum Stress Tensor Fluctuations
• Trapping effects on inflation
• Quantum Stress Tensor Fluctuations of a Conformal Field and Inflationary Cosmology
• The hybrid curvaton
• Affleck-Dine baryogenesis in inflating curvaton scenario with O($10-10^2$TeV) mass moduli curvaton