2005/02/18 by George Lazarides
Physics and Astronomy · #Black Holes and Theoretical Physics #Cosmology and Gravitation Theories #Galaxies: Formation, Evolution, Phenomena #hep-ph
paper · pdf · doi:10.1016/j.nuclphysbps.2005.04.054
Talk given at the Workshop "The density perturbation in the universe", 25-26 June 2004, Athens, Greece (to appear in the proceedings), 12 pages including 4 figures, uses espcrc2.sty
arxiv created 2005/02/18 · openalex publication_date 2005/05/24 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/29
We consider a supersymmetric grand unified model which leads to hybrid inflation and solves the strong CP and mu problems via a Peccei-Quinn symmetry, with the Peccei-Quinn field acting as a curvaton generating together with the inflaton the curvature perturbation. The model yields an isocurvature perturbation too of mixed correlation with the adiabatic one. Two choices of parameters are confronted with the Wilkinson microwave anisotropy probe and other cosmic microwave background radiation data. For the choice giving the best fitting, the curvaton contribution to the amplitude of the adiabatic perturbation must be smaller than 67% at 95% confidence level and the best-fit power spectra are dominated by the adiabatic inflaton contribution. This case is disfavored relative to the pure inflaton scale-invariant case with odds of 50 to 1. For the second choice, the adiabatic mode is dominated by the curvaton, but this case is strongly disfavored relative to the pure inflaton case (with odds of 107 to 1). Thus, in this model, the perturbations must be dominated by the adiabatic component from the inflaton.