ЭФФЕКТЫ, СВЯЗАННЫЕ С КОНЕЧНЫМИ РАЗМЕРАМИ ПРОСТРАНСТВА, В МОДЕЛИ ГРОССА--НЕВЕ С УЧЕТОМ ИЗОТОПИЧЕСКОГО И БАРИОННОГО ХИМИЧЕСКИХ ПОТЕНЦИАЛОВ

Авторы: ЖУКОВСКИЙ В.Ч., КЛИМЕНКО К.Г., ХУНДЖУА Т.Г., ЭБЕРТ Д.
Журнал: Ядерная физика
Том: 77
Номер: 6
Год издания: 2014
Издательство: ФГБУ "Издательство "Наука"
Местоположение издательства: Москва
Первая страница: 839
Последняя страница: 847
DOI: 10.1134/S1063778814060155
Аннотация: The properties of the (1 + 1)-dimensional massless Gross-Neveu model were studied for a compactified space S (1), as well as with allowance for nonzero values of the baryon (µ) and isospin (µ( )I( )) chemical potentials. Our investigation was performed in the limit of a large number of fermion colors, N ( )c( ). 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 µ( )I( ) 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.
Добавил в систему: Жуковский Владимир Чеславович

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