2009/05/21 by Chris Graham, Ian G. Moss, Ian G Moss · 3 citations
Earth and Planetary Sciences · Physics and Astronomy · #Amplitude #Black Holes and Theoretical Physics #Classical mechanics #Cosmic microwave background #Cosmology and Gravitation Theories #Fluctuation spectrum #Geophysics and Gravity Measurements #Inflation (cosmology) #Inflaton #Physics #Primordial fluctuations #Quantum electrodynamics #Quantum mechanics #Spectral density #Theoretical physics #Thermal #Thermal fluctuations #Thermodynamics #astro-ph.CO
paper · pdf · doi:10.1088/1475-7516/2009/07/013
published as JCAP 0907:013,2009 · 14 pages, 4 figures, ReVTeX
arxiv created 2009/05/21 · openalex publication_date 2009/07/09 · arxiv updated 2010/04/28 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
Thermal fluctuations provide the main source of large scale density perturbations in warm inflationary models of the early universe. For the first time, general results are obtained for the power spectrum in the case when the friction coefficient in the inflaton equation of motion depends on temperature. A large increase in the amplitude of perturbations occurs when the friction coefficient increases with temperature. This has to be taken into account when constructing models of warm inflation. New results are also given for the thermal fluctuations in the weak regime of warm inflation when the friction coefficient is relatively small.