Light meson gas in the QCD vacuum and oscillating universe

George Prokhorov, Roman Pasechnik

Research output: Contribution to journalArticlepeer-review


We have developed a phenomenological effective quantum-field theoretical model describing the "hadron gas" of the lightest pseudoscalar mesons, scalar σ-meson and σ-vacuum, i.e. the expectation value of the σ-field, at finite temperatures. The corresponding thermodynamic approach was formulated in terms of the generating functional derived from the effective Lagrangian providing the basic thermodynamic information about the "meson plasma + QCD condensate" system. This formalism enables us to study the QCD transition from the hadron phase with direct implications for cosmological evolution. Using the hypothesis about a positively-definite QCD vacuum contribution stochastically produced in early universe, we show that the universe could undergo a series of oscillations during the QCD epoch before resuming unbounded expansion.

Original languageEnglish
Article number017
JournalJournal of Cosmology and Astroparticle Physics
Issue number1
Publication statusPublished - 2018 Jan 1

Subject classification (UKÄ)

  • Astronomy, Astrophysics and Cosmology

Free keywords

  • cosmological phase transitions
  • particle physics-cosmology connection
  • physics of the early universe


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