PEAKS ABOVE THE HARRISON-ZELDOVICH SPECTRUM DUE TO THE QUARK-GLUON TOHADRON TRANSITION

Citation
C. Schmid et al., PEAKS ABOVE THE HARRISON-ZELDOVICH SPECTRUM DUE TO THE QUARK-GLUON TOHADRON TRANSITION, Physical review letters, 78(5), 1997, pp. 791-794
Citations number
31
Categorie Soggetti
Physics
Journal title
ISSN journal
00319007
Volume
78
Issue
5
Year of publication
1997
Pages
791 - 794
Database
ISI
SICI code
0031-9007(1997)78:5<791:PATHSD>2.0.ZU;2-T
Abstract
The quark-gluon to hadron transition affects the evolution of cosmolog ical perturbations. If the phase transition is first order, the sound speed vanishes during the transition, and density perturbations fall f reely. This distorts the primordial Harrison-Zel'dovich spectrum of de nsity 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 mat ter which is kinetically decoupled well before the QCD transition, clu mps of masses below 10-(10)M(circle dot), an produced.