2009/09/02 by Konstantinos Dimopoulos, Mindaugas Karčiauskas, Mindaugas Karciauskas +1 · 1 citation
Earth and Planetary Sciences · Economics, Econometrics and Finance · Mathematics · Physics and Astronomy · #Anisotropy #Bispectrum #Classical mechanics #Cosmic microwave background #Cosmology and Gravitation Theories #Curvature #Geometry #Geophysics and Gravity Measurements #Inflation (cosmology) #Isotropy #Kinetic energy #Kinetic term #Mathematics #Mechanics #Non-Gaussianity #Perturbation (astronomy) #Physics #Quantum mechanics #Scalar (mathematics) #Scalar field #Spectral density #Stochastic processes and financial applications #Theoretical physics #Vector field #astro-ph.CO #hep-ph
paper · pdf · doi:10.1016/j.physletb.2009.12.024
published as Phys.Lett.B683:298-301,2010 · 4 pages, RevTex
arxiv created 2009/09/02 · openalex publication_date 2009/12/22 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
A vector curvaton model with a Maxwell kinetic term and varying kinetic function and mass during inflation is studied. It is shown that, if light until the end of inflation, the vector field can generate statistical anisotropy in the curvature perturbation spectrum and bispectrum, with the latter being predominantly anisotropic. If by the end of inflation the vector field becomes heavy, then particle production is isotropic and the vector curvaton can alone generate the curvature perturbation. The model does not suffer from instabilities such as ghosts and is the only concrete model, to date, which can produce the curvature perturbation without direct involvement of fundamental scalar fields.