Reactions governing strangeness abundance in primordial universe

Johann Rafelski, Cheng Tao Yang

Research output: Contribution to journalArticlepeer-review


Strangeness flavor is abundant and in chemical equilibrium in the primordial Quark-Gluon Plasma(QGP) filling the early Universe. Upon hadronization near to T = 150 MeV one may think that relatively short lived massive strange hadrons decay rapidly and strangeness disappears. However, we show using detailed balance considerations for inverse decay reactions that the back reaction repopulate strangeness keeping it in chemical equilibrium at least to the time when strange antibaryons annihilate near T ' 30-50 MeV. However, our present study is focused on the meson sector of the hadronic Universe. Specifically, we establish here the temperature range in which the expansion of the Universe becomes faster compared to the production processes which balance natural strangeness decay: In the temperature interval 33 MeV < T < 20 MeV: µ± + νµ → K±, π + π → K and l + l+ → φ reactions in sequence become slower compared to the characteristic Hubble time.

Original languageEnglish (US)
JournalUnknown Journal
StatePublished - Sep 11 2020


  • Cosmology
  • Primordial universe
  • Strangeness

ASJC Scopus subject areas

  • General

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