2000/09/30 by F. Finelli, F. Finelli⋆, Sergei Khlebnikov +1 · 2 citations
Physics and Astronomy · #Black Holes and Theoretical Physics #Cosmology and Gravitation Theories #Particle physics theoretical and experimental studies #astro-ph #gr-qc #hep-ph
paper · pdf · doi:10.1016/s0370-2693(01)00288-x
published as Phys.Lett. B504 (2001) 309-313 · 9 pages, revtex, 4 figures; corrected typo in eq. (1). Time variable in the plots was slightly messed up: fixed in v3 (a cosmetic change)
arxiv created 2001/02/28 · openalex publication_date 2001/04/01 · arxiv updated 2009/11/30 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
We study numerically evolution of metric perturbations during reheating in a model with two fields and a strong parametric resonance. Our calculation is fully nonlinear and includes gravity but is restricted to spherical symmetry. In this model, super-Hubble metric perturbations can grow during reheating only due to effects nonlinear in fluctuations of the fields. We find that they indeed grow and, soon after the growth begins, dominate variances of the metric functions. Thus, the metric functions become smooth but varying significantly over large scales. Their profiles at late times are interpreted as signalling a gravitational instability and formation of a black hole.