2003/03/31 by Konstantinos Dimopoulos, G. Lazarides, George Lazarides +3 · 6 citations
Physics and Astronomy · #Anisotropy #Astrophysics #Axion #Black Holes and Theoretical Physics #Cosmic background radiation #Cosmic microwave background #Cosmological perturbation theory #Cosmology #Cosmology and Gravitation Theories #Curvature #Dark Matter and Cosmic Phenomena #Dark matter #Leptogenesis #Lepton #Non-Gaussianity #Particle physics #Perturbation (astronomy) #Physics #Quantum mechanics #astro-ph #hep-ph
paper · pdf · doi:10.1088/1126-6708/2003/05/057
published as JHEP 0305 (2003) 057 · 34 pages including 6 figures, uses JHEP3.cls, version to appear in JHEP
openalex publication_date 2003/05/25 · arxiv created 2003/06/02 · arxiv updated 2009/11/30 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
A simple extension of the minimal supersymmetric standard model which naturally and simultaneously solves the strong CP and mu problems via a Peccei-Quinn and a continuous R symmetry is considered. This model is supplemented with hybrid inflation and leptogenesis, but without taking the specific details of these scenarios. It is shown that the Peccei-Quinn field can successfully act as a curvaton generating the total curvature perturbation in the universe in accord with the cosmic background explorer measurements. A crucial phenomenon, which assists us to achieve this, is the "tachyonic amplification" of the perturbation acquired by this field during inflation if the field, in its subsequent evolution, happens to be stabilized for a while near a maximum of the potential. In this case, the contribution of the field to the total energy density is also enhanced ("tachyonic effect"), which helps too. The cold dark matter in the universe consists, in this model, mainly of axions which carry an isocurvature perturbation uncorrelated with the total curvature perturbation. There are also lightest sparticles (neutralinos) which, like the baryons, originate from the inflationary reheating and, thus, acquire an isocurvature perturbation fully correlated with the curvature perturbation. So, the overall isocurvature perturbation has a mixed correlation with the adiabatic one. It is shown that the presently available bound on such an isocurvature perturbation from cosmic microwave background radiation and other data is satisfied. Also, the constraint on the non-Gaussianity of the curvature perturbation obtained from the recent Wilkinson microwave anisotropy probe data is fulfilled thanks to the "tachyonic effect".