A Little Inflation in the Early Universe at the QCD Phase Transition

作者：Boeckel Tillmann^*; Schaffner Bielich Juergen

来源：Physical Review Letters, 2010, 105(4): 041301.

DOI：10.1103/PhysRevLett.105.041301

We explore a scenario that allows for a strong first order phase transition of QCD at a non-negligible baryon number in the early Universe and its possible observable consequences. The main assumption is a quasistable QCD-vacuum state that leads to a short period of inflation, consequently diluting the net baryon to photon ratio to today's observed value. A strong mechanism for baryogenesis is needed to start out with a baryon asymmetry of order unity, e. g., as provided by Affleck-Dine baryogenesis. The cosmological implications are direct effects on primordial density fluctuations up to dark matter mass scales of M(max) similar to 1-10M(circle dot), change in the spectral slope up to M(max) similar to 10(6)-10(8)M(circle dot), productio

• 出版日期2010-7-19