Scale-invariant scalar spectrum from the nonminimal derivative coupling with fourth-order term
arXiv:1502.03881 · doi:10.1142/S0218271815500959
Abstract
An exactly scale-invariant spectrum of scalar perturbation generated during de Sitter spacetime is found from the gravity model of the nonminimal derivative coupling with fourth-order term. The nonminimal derivative coupling term generates a healthy (ghost-free) fourth-order derivative term, while the fourth-order term provides an unhealthy (ghost) fourth-order derivative term. The Harrison-Zel'dovich spectrum obtained from Fourier transforming the fourth-order propagator in de Sitter space is recovered by computing the power spectrum in its momentum space directly. It shows that this model provides a truly scale-invariant spectrum, in addition to the Lee-Wick scalar theory.
1+18 pages, no figure, version to appear in Int. J. Mod. Phys. D
References in corpus (9)
- Generalized Galileons: All scalar models whose curved background extensions maintain second-order field equations and stress tensors
- Galilean Genesis: an alternative to inflation
- Quintessence and phantom cosmology with non-minimal derivative coupling
- The effective field theory of inflation/dark energy and the Horndeski theory
- Harrison-Z'eldovich primordial spectrum is consistent with observations
- Stabilization of Linear Higher Derivative Gravity with Constraints
- PRISM: Recovery of the primordial spectrum from Planck data
- Scale-invariant tensor spectrum from conformal gravity
- Scale-invariant spectrum of Lee-Wick model in de Sitter spacetime