紀要論文 拡張された線形σモデルによる核物質の計算
Calculation of Nuclear Matter Properties with Extended Linear Sigma Model

手塚, 洋一

62pp.95 - 125 , 2018-03 , 東洋大学自然科学研究室
ISSN:1346-8987
NII書誌ID(NCID):AA11541176
内容記述
The linear sigma model with repulsive vector meson contributions can reproduce theproperties of nuclear saturation if we assume the pion pair condensation.But this modelcannot give the suitable value to the nuclear incompressibility. In order to obtainthe suitable incompressibility,higher order chiral loop interaction terms or other scalarmesons were introduced.These models could not reproduce the nuclear saturation andthe incompressibility simultaneously.The next extension was addition of different mass terms of scalar meson σ and pseudoscalarmeson π,and chiral loop interaction with vector meson ω and σ.This model can reproduce the nuclear saturation and the incompressibility both without pion condensation and with pion pair condensation.In the previous work,the coupling constant of the ω with the chiral loop was taken to be the square of ω-nuclear interaction team.This in because we thought ω was introduced by the replacement of the covariant differentiation even for those of σ and π. In this article this coupling constant is treated as a free parameter.then the nuclear saturation and the incompressibility are reproduced without higher chiral loop terms.
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