2006/08/09 by Soo A Kim, Soo A. Kim, Andrew R. Liddle · 3 citations
Economics, Econometrics and Finance · Mathematics · Physics and Astronomy · #Combinatorics #Cosmology and Gravitation Theories #Field (mathematics) #Galaxies: Formation, Evolution, Phenomena #Generalization #Horizon #Inflation (cosmology) #Mathematical analysis #Mathematics #Monomial #Nonlinear system #Observable #Physics #Pure mathematics #Quantum mechanics #Spectrum (functional analysis) #Statistical physics #Stochastic processes and financial applications #Theoretical physics #astro-ph
paper · pdf · doi:10.1103/physrevd.74.063522
published as Phys.Rev. D74 (2006) 063522 · 3 pages RevTeX4, no figures
arxiv created 2006/08/09 · openalex publication_date 2006/09/22 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
We analyze the cosmic nongaussianity produced in inflation models with multiple uncoupled fields with monomial potentials, such as Nflation. Using the horizon-crossing approximation to compute the nongaussianity, we show that when each field has the same form of potential, the prediction is independent the number of fields, their initial conditions, and the spectrum of masses/couplings. It depends only on the number of e-foldings after the horizon crossing of observable perturbations. We also provide a further generalization to the case where the fields can have monomial potentials with different powers. Unless the horizon-crossing approximation is substantially violated, the predicted nongaussianity is too small to ever be observed.