2008/02/29 by Martin Lemoine, Jerome Martin, Jérôme Martin +2 · 2 citations
Physics and Astronomy · #Annihilation #Asymmetry #Baryon #Baryon number #Black Holes and Theoretical Physics #Cosmology and Gravitation Theories #Nuclear physics #Particle physics #Physics #Radiation #Solar and Space Plasma Dynamics #astro-ph #gr-qc #hep-ph #hep-th
paper · pdf · doi:10.1103/physrevd.78.063516
published as Phys.Rev.D78:063516,2008 · 11 pages, 4 figures, published version
openalex publication_date 2008/09/10 · arxiv created 2008/10/06 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
This paper calculates the amount of baryon/radiation isocurvature fluctuation produced through the decay of a curvaton field. It is shown, in particular, that if curvaton decay preserves the baryon number and the curvaton dominates the energy density at the time of decay, the initial curvaton/radiation isocurvature mode is entirely transferred into a baryon/radiation isocurvature mode. This situation is opposite to that previously studied in three fluid models of curvaton decay; this difference is related to the conservation of the preexisting baryon asymmetry and to the efficiency of the annihilation of all baryon/antibaryon pairs produced in the decay. We study in detail the relevant cases in which the curvaton decay preserves or not the baryon number and provide analytical and numerical calculations for each situation.