Light meson gas in the QCD vacuum and oscillating universe

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61389005%3A_____%2F18%3A00486476" target="_blank" >RIV/61389005:_____/18:00486476 - isvavai.cz</a>
Result on the web
<a href="http://dx.doi.org/10.1088/1475-7516/2018/01/017" target="_blank" >http://dx.doi.org/10.1088/1475-7516/2018/01/017</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1088/1475-7516/2018/01/017" target="_blank" >10.1088/1475-7516/2018/01/017</a>

Result language
angličtina
Original language name
Light meson gas in the QCD vacuum and oscillating universe
Original language description
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.
Czech name
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Czech description
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Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
10308 - Astronomy (including astrophysics,space science)

Project
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Continuities
I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year
2018
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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