1996/06/30 by Christoph Schmid, Dominik J. Schwarz, Peter Widerin · 6 citations
Physics and Astronomy · #Cosmology and Gravitation Theories #Dark Matter and Cosmic Phenomena #Particle physics theoretical and experimental studies #astro-ph #gr-qc #hep-ph
paper · pdf · doi:10.1103/physrevlett.78.791
published as Phys.Rev.Lett.78:791-794,1997 · Extended version, including evolution of density perturbations for a bag model and for a lattice QCD fit (3 new figures). Spectrum for bag model (old figure) is available in astro-ph/9611186. 9 pages RevTeX, uses epsf.sty, 3 PS figures
arxiv created 1996/11/25 · openalex publication_date 1997/02/03 · arxiv updated 2009/11/30 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
The quark-gluon to hadron transition affects the evolution of cosmological perturbations. If the phase transition is first order, the sound speed vanishes during the transition, and density perturbations fall freely. This distorts the primordial Harrison-Zel'dovich spectrum of density fluctuations below the Hubble scale at the transition. Peaks are produced, which grow, at most, linearly in wave number, both for the hadron-photon-lepton fluid and for cold dark matter. For cold dark matter which is kinetically decoupled well before the QCD transition, clumps of masses below 10^\ensuremath-10M_\ensuremath\bigodot are produced.