2012/05/31 by Xingang Chen, Yi Wang · 3 citations
Physics and Astronomy · #Astrophysics #Black Holes and Theoretical Physics #Cosmology #Cosmology and Gravitation Theories #Coupling (piping) #Dark energy #Field (mathematics) #Galaxies: Formation, Evolution, Phenomena #Hubble's law #Inflation (cosmology) #Limit (mathematics) #Mathematical analysis #Order (exchange) #Physics #Quantum electrodynamics #Range (aeronautics) #Spectral density #Statistical physics #Statistics #Theoretical physics #astro-ph.CO #gr-qc #hep-ph #hep-th
paper · pdf · doi:10.1088/1475-7516/2012/09/021
19 pages, 6 figures; v2: minor revision
arxiv created 2012/07/03 · openalex publication_date 2012/09/17 · arxiv updated 2015/06/04 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/06
We study the effect of massive isocurvaton on density perturbations in quasi-single field inflation models, when the mass of the isocurvaton M becomes larger than the order of the Hubble parameter H . We analytically compute the correction to the power spectrum, leading order in coupling but exact for all values of mass. This verifies the previous numerical results for the range 0 < M < 3 H /2 and shows that, in the large mass limit, the correction is of order H 2 / M 2 .