Roman Pasechnik
Senior lecturer
Light meson gas in the QCD vacuum and oscillating universe
Author
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 - Has been reorganised
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