0486476 - ÚJF 2019 RIV GB eng J - Článek v odborném periodiku
Prokhorov, G. - Pasechnik, Roman
Light meson gas in the QCD vacuum and oscillating universe.
Journal of Cosmology and Astroparticle Physics. Roč. 2018, č. 1 (2018), č. článku 017. ISSN 1475-7516. E-ISSN 1475-7516
Institucionální podpora: RVO:61389005
Klíčová slova: particle physics - cosmology connection * cosmological phase transitions * physics of the early universe
Obor OECD: Astronomy (including astrophysics,space science)
Impakt faktor: 5.524, rok: 2018 ; AIS: 1.227, rok: 2018
DOI: https://doi.org/10.1088/1475-7516/2018/01/017

We have developed a phenomenological effective quantum-field theoretical model describing the 'hadron gas' of the lightest pseudoscalar mesons, scalar sigma-meson and sigma-vacuum, i.e. the expectation value of the sigma-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.
Trvalý link: http://hdl.handle.net/11104/0281350