2016/08/31 by Christian T. Byrnes, Christian T Byrnes, Marina Cortês +2
Physics and Astronomy · #Advanced Differential Geometry Research #Amplitude #Astrophysics #Black Holes and Theoretical Physics #Cosmology and Gravitation Theories #Inflation (cosmology) #Inflaton #Observable #Parameter space #Particle physics #Physics #Quantum mechanics #Statistics #Theoretical physics #Universe #astro-ph.CO #hep-ph
paper · pdf · doi:10.1103/physrevd.94.063525
published as Phys. Rev. D 94, 063525 (2016) · 9 pages PDFLatex with 6 incorporated figures. Minor updates to match PRD published version
openalex publication_date 2016/09/21 · arxiv created 2016/12/02 · arxiv updated 2016/12/05 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
We consider the possible decay of the inflaton into curvaton particles during reheating and analyze its effect on curvaton scenarios. Typical decay curvatons are initially relativistic then become nonrelativistic, changing the background history of the Universe. We show that this change to the background is the only way in which observational predictions of the scenario are modified. Moreover, once the required amplitude of perturbations is fixed by observation there are no signatures of such decays in other cosmological observables. The decay curvatons can prevent the Universe from becoming dominated by the curvaton condensate, making it impossible to match observations in parts of parameter space. This constrains the branching ratio of the inflaton to curvaton to be less than of order 0.1 typically. If the branching ratio is below about 10^\ensuremath-4 it has negligible impact on the model parameter space and can be ignored.