Curvaton with nonminimal derivative coupling to gravity

2013/07/31 by Kaixi Feng, Taotao Qiu, Yun-Song Piao · 38 citations
Mathematics · Physics and Astronomy · #Adiabatic process #Black Holes and Theoretical Physics #Classical mechanics #Cosmology and Gravitation Theories #Coupling (piping) #Coupling constant #Derivative (finance) #Geometry #Gravitation #Mathematical physics #Mathematics #Physics #Quantum electrodynamics #Quantum mechanics #Solar and Space Plasma Dynamics #Tensor (intrinsic definition) #Vibronic coupling #gr-qc #hep-th

paper · pdf · doi:10.1016/j.physletb.2014.01.008

published in Physics Letters B 729, 99-107 (Elsevier BV) · 11 pages

openalex publication_date 2014/01/10 · arxiv created 2014/01/18 · arxiv updated 2015/06/16 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05

Abstract

We show a curvaton model, in which the curvaton has a nonminimal derivative coupling to gravity. Thanks to such a coupling, we find that the scale-invariance of the perturbations can be achieved for arbitrary values of the equation-of-state of background, provided that it is nearly a constant. We also discussed about tensor perturbations, the local non-Gaussianities generated by the nonminimal derivative coupling curvaton model, as well as the adiabatic perturbations which are transferred from the field perturbations during the curvaton decay.

Citations

• Conformal invariance of scalar perturbations in inflation
• Nearly scale-invariant spectrum of adiabatic fluctuations may be from a very slowly expanding phase of the Universe
• Generalized Galileons: All scalar models whose curved background extensions maintain second-order field equations and stress tensors
• Signatures of non-Gaussianity in the curvaton model
• A General Analytic Formula for the Spectral Index of the Density Perturbations produced during Inflation
• Primordial density perturbation in the curvaton scenario
• Super-Horizon Scale Dynamics of Multi-Scalar Inflation
• The galileon as a local modification of gravity
• Scale dependence of localfNL
• Generalized G-inflation: Inflation with the most general second-order field equations
• Covariant Galileon

Cited by

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• Gravitational waves induced by spinor fields
• Curvaton reheating in non-minimal derivative coupling to gravity: NO models
• Thermodynamics of general scalar-tensor theory with non-minimally derivative coupling