1997/04/25 by Dominik J. Schwarz, Christoph Schmid, Schwarz, Dominik J. +5
Physics and Astronomy · #Astrophysics (astro-ph) #FOS: Physical sciences #General Relativity and Quantum Cosmology (gr-qc) #High Energy Physics - Phenomenology (hep-ph) #High-Energy Particle Collisions Research #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions #astro-ph #gr-qc #hep-ph
paper · pdf · doi:10.48550/arxiv.astro-ph/9704250
Talk given at the Third International Conference on Physics and Astrophysics of the Quark Gluon Plasma, March 17 -- 21, 1997, Jaipur, India; 5 pages, LaTeX2e, 1 ps figure
arxiv created 1997/04/25 · openalex publication_date 1997/04/25 · arxiv updated 2009/11/30 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
We investigate the effect of the cosmological QCD transition on the evolution of primordial density perturbations. If the phase transition is first order, the sound speed vanishes during the transition and density perturbations fall freely. The Harrison-Zel'dovich spectrum of density fluctuations develops large peaks on scales below the Hubble radius at the transition. These peaks above the primordial spectrum grow with wavenumber and produce cold dark matter clumps of masses less than 10-10 M_\odot. At the horizon scale the amplification of overdensities is of order unity, and thus no 1 M_\odot black hole production is possible for a COBE normalized scale-invariant spectrum.