The running curvaton *

Author:

Liu Lei-Hua,Xu Wu-Long

Abstract

Abstract In this paper, we propose a homogeneous curvaton mechanism that operates during the preheating process and in which the effective mass is running (i.e., its potential consists of a coupling term and an exponential term whose contribution is subdominant thereto). This mechanism can be classified into either narrow resonance or broad resonance cases, with the spectral index of the curvaton consituting the deciding criteria. The inflationary potential is that of chaotic inflation (i.e., a quadratic potential), which could result in a smooth transition into the preheating process. The entropy perturbations are converted into curvature perturbations, which we validate using the formalism. By neglecting the exponential term's contribution to the curvaton potential, we calculate the power spectrum and the nonlinear non-Gaussian parameter . Our calculations analytically show that these two observables are independent of the inflaton potential. Finally, when the curvaton decays (and the inflaton field vanishes), the exponential potential approaches a constant value similar to that of the cosmological constant, which may play the role of dark energy.

Publisher

IOP Publishing

Subject

Astronomy and Astrophysics,Instrumentation,Nuclear and High Energy Physics

Cited by 5 articles. 订阅此论文施引文献 订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献

1. Cosmological complexity of the modified dispersion relation;Physics Letters B;2024-07

2. Mimetic curvaton;Physical Review D;2023-02-09

3. Complexity of non-trivial sound speed in inflation;Physics of the Dark Universe;2022-09

4. Non-minimally coupled curvaton;Journal of Cosmology and Astroparticle Physics;2021-06-01

5. Revised fNL parameter in a curvaton scenario;Physical Review D;2021-03-16

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