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Light meson gas in the QCD vacuum and oscillating universe

Prokhorov, George and Pasechnik, Roman LU (2018) In Journal of Cosmology and Astroparticle Physics 2018(1).
Abstract

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... (More)

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.

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author
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organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
cosmological phase transitions, particle physics-cosmology connection, physics of the early universe
in
Journal of Cosmology and Astroparticle Physics
volume
2018
issue
1
article number
017
publisher
IOP Publishing
external identifiers
  • scopus:85041423475
ISSN
1475-7516
DOI
10.1088/1475-7516/2018/01/017
language
English
LU publication?
yes
id
a5d888ae-5ba2-468d-955f-1cded9dc27a5
date added to LUP
2018-02-16 07:34:31
date last changed
2021-08-18 02:44:21
@article{a5d888ae-5ba2-468d-955f-1cded9dc27a5,
  abstract     = {<p>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.</p>},
  author       = {Prokhorov, George and Pasechnik, Roman},
  issn         = {1475-7516},
  language     = {eng},
  month        = {01},
  number       = {1},
  publisher    = {IOP Publishing},
  series       = {Journal of Cosmology and Astroparticle Physics},
  title        = {Light meson gas in the QCD vacuum and oscillating universe},
  url          = {http://dx.doi.org/10.1088/1475-7516/2018/01/017},
  doi          = {10.1088/1475-7516/2018/01/017},
  volume       = {2018},
  year         = {2018},
}