2007/01/31 by Ki-Young Choi, Lisa M. Hall, Lisa M. H. Hall +1 · 96 citations
Physics and Astronomy · #Adiabatic process #Black Holes and Theoretical Physics #Classical mechanics #Cosmic microwave background #Cosmological perturbation theory #Cosmology and Gravitation Theories #Coupling (piping) #Field (mathematics) #Galaxies: Formation, Evolution, Phenomena #Inflation (cosmology) #Inflaton #Non-Gaussianity #Physics #Quantum mechanics #Scalar (mathematics) #Scalar field #Statistical physics #String theory #Theoretical physics #astro-ph
paper · pdf · doi:10.1088/1475-7516/2007/02/029
published in Journal of Cosmology and Astroparticle Physics 2007(02), 029 (Institute of Physics) · 26 pages, 10 figures, JHEP style, typos corrected, appendix and references added, published in JCAP
arxiv created 2007/02/23 · openalex publication_date 2007/02/23 · arxiv updated 2010/10/27 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/06
Theories beyond the standard model such as string theory motivate low energy effective field theories with several scalar fields which are not only coupled through a potential but also through their kinetic terms. For such theories we derive the general formulae for the running of the spectral indices for the adiabatic, isocurvature and correlation spectra in the case of two-field inflation. We also compute the expected non-Gaussianity in such models for specific forms of the potentials. We find that the coupling has little impact on the level of non-Gaussianity during inflation.