2003/02/26 by Takahiro Tanaka, Tanaka, Takahiro, Bruce A. Bassett +2 · 1 citation
Engineering · Mathematics · Physics and Astronomy · #Astrophysics (astro-ph) #FOS: Physical sciences #Gas Dynamics and Kinetic Theory #Radiative Heat Transfer Studies #astro-ph
paper · pdf · doi:10.48550/arxiv.astro-ph/0302544
Proceedings of 12th JGRG meeting (Tokyo, Nov.25-28(2002))
arxiv created 2003/02/26 · openalex publication_date 2003/02/26 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
The dynamics of preheating after inflation has not been clearly understood yet.In particular, the issue of the generation of metric perturbations during preheating on super-horizon scale is still unsettled. Large scale perturbations may leave an imprint on the cosmic microwave background, or may become seeds for generation of primordial black holes. Hence, in order to make a connection between the particle physics models and cosmological observations, understanding the evolution of super-Hubble scale perturbations during preheating is important. Here, we propose an alternative treatment to handle this issue based on the so-called separate universe approach, which suggests less efficient amplification of super-Hubble modes during preheating than was expected before. We also point out an important issue which may have been overlooked in previous treatments.