Finite-size effects in the Gross-Neveu model with allowance for isospin and baryon chemical potentials

Autor:	Dietmar Ebert, K. G. Klimenko, V. Ch. Zhukovsky, T. G. Khunjua
Rok vydání:	2014
Předmět:	Physics Quark Nuclear and High Energy Physics Particle physics Phase portrait High Energy Physics::Lattice High Energy Physics::Phenomenology Nuclear Theory Fermion Atomic and Molecular Physics and Optics Massless particle Baryon Strange matter Gross–Neveu model Isospin
Zdroj:	Physics of Atomic Nuclei. 77:795-803
ISSN:	1562-692X 1063-7788
Popis:	The properties of the (1 + 1)-dimensional massless Gross-Neveu model were studied for a compactified space S1, as well as with allowance for nonzero values of the baryon (µ) and isospin (µI) chemical potentials. Our investigation was performed in the limit of a large number of fermion colors, Nc. It is shown that, for L→∞(case of an unbounded volume), the pion-condensation phase characterized by zero quark density is formed at any nonzero value of µI and a small value of µ. For any finite value of L (case of a bounded volume), the phase portrait of the model contains a pion-condensation phase where the quark density is nonzero. Thus, finite dimensions of the system being considered may serve as a factor that facilitates the formation of a pion-condensation phase in quark matter with a nonzero baryon density. At the same time, the phase where chiral symmetry is broken may exist only at very large values of L.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::09884a472890700c3f522765609d1bf0 https://doi.org/10.1134/s1063778814060155 Zobrazit plný text záznamu Plný text ve formátu PDF