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Typical working day..

Roman Pasechnik

Senior lecturer

Typical working day..

Light meson gas in the QCD vacuum and oscillating universe

Author

  • George Prokhorov
  • Roman Pasechnik

Summary, in English

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.

Department/s

  • Theoretical Particle Physics

Publishing year

2018-01-01

Language

English

Publication/Series

Journal of Cosmology and Astroparticle Physics

Volume

2018

Issue

1

Document type

Journal article

Publisher

IOP Publishing

Topic

  • Astronomy, Astrophysics and Cosmology

Keywords

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

Status

Published

ISBN/ISSN/Other

  • ISSN: 1475-7516