Light meson gas in the QCD vacuum and oscillating universe
(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.
(Less)
- author
- Prokhorov, George and Pasechnik, Roman LU
- organization
- publishing date
- 2018-01-01
- 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
- 2024-01-14 15:09:56
@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}},
keywords = {{cosmological phase transitions; particle physics-cosmology connection; physics of the early universe}},
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}},
}