Modulated inflation

2008/01/31 by Tomohiro Matsuda · 2 citations
Physics and Astronomy · #Black Holes and Theoretical Physics #Cosmology and Gravitation Theories #Galaxies: Formation, Evolution, Phenomena #astro-ph #hep-ph #hep-th

paper · pdf · doi:10.1016/j.physletb.2008.06.030

published as Phys.Lett.B665:338-343,2008 · 17pages, k^2/a^2 is included, accepted for publication in PLB

arxiv created 2008/06/14 · openalex publication_date 2008/06/20 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/01

Abstract

We have studied modulated inflation that generates curvature perturbation from light-field fluctuation. As discussed in previous works, even if the fluctuation of the inflaton itself does not generate the curvature perturbation, fluctuation of a light field may induce fluctuation for the end-line of inflation and this may lead to generation of cosmological perturbation “at the end of the inflation”. Our scenario is different from this kind of modulated scenario, as clearly explained in this Letter by using δN formalism. We also explain the crucial difference from the standard multi-field inflation model. We show concrete examples of the modulated inflation scenario in which large non-gaussianity can be generated. We also discuss the running of the non-gaussianity parameter.

Citations

• New developments on embedding inflation in gauge theory and particle physics
• Kaluza-Klein modes in hybrid inflation
• Dynamics of a large extra dimension inspired hybrid inflation model
• The shape of non-Gaussianities
• Hybrid curvatons from broken symmetry
• Primordial density perturbation in the curvaton scenario
• Non-Gaussianity from instant and tachyonic preheating

Cited by

• Running spectral index from shooting-star moduli
• A geometric description of the non-Gaussianity generated at the end of multi-field inflation