The running curvaton

Abstract

According to the whole evolution of curvaton, we systematically investigate a broad new class of curvaton scenarios, in which the effective mass of curvaton is running (its potential consists of coupling part and exponential part). In this scenario, the coupling is between the curvaton and inflaton. Consequently, we adopt the narrow and broad resonance to study the production of curvation in terms of preheating, whose criteria comes via the spectral index of curvaton. In order to elaborate this scenario, we implement the δN formalism to calculate the local Non-Gaussianity parameter f N L and the power spectrum P ζ of curvaton. Remarkably, our calculation shows that these two observables are independent of potential of inflaton. Once the constraints are given, these two observables are consistent with the observations. As the curvaton almost decay (inflaton field vanishes), the exponential potential will be approaching a constant of order of cosmological constant, which could play a role of dark energy.

Holographic complexity growth for a charged AdS-dilaton black holes with fixed and dynamical boundary respectively

“…Besides, [53] considers the time dependence of the quantum computational complexity of scalar curvature perturbations on an early-time period of de Sitter expansion followed by a radiation-dominated era. And it is interesting to generalize the scalar curvature perturbations into the curvaton models [54][55][56][57][58]. Finally, it is also worthwhile to explore the holographic complexity growth for AdS-dilaton black holes with a probe string, like the work [59,60].…”

Non-minimally coupled curvaton

“…such that the norm of the entropy vector is unity, σA = 1. In terms of these quantities the background Friedmann equations (15)(16) simplify to,…”

“…There are situations where the inflaton does not decay perturbatively, but instead nonperturbative decay channels, such as parametric resonant or tachyonic decay channels [8][9][10][11][12][13][14] are more efficient. The possibility that the curvaton may decay non-perturbatively has also been envisaged [15,16]. Furthermore, it is known that one can produce a significant amount of gravitational waves during preheating [17].…”

“…One can easily show that Eq. (17) is not independent, as it can be derived from covariant conservation of the background stress-energy tensor, ρ + 3H(ρ + P) = 0 and the Friedmann equation(15).…”