标题： 当前代数和不对称夸克物质中的软介子模态 显示英文标题

标题： Current algebra and soft pionic modes in asymmetric quark matter

摘要： 在组成夸克的同位旋不对称费米气体中分析了介子激发。 发现除了普通的介子激发外，还存在一个非常低的集体模式，其量子数为带电介子（自旋-同位旋声子）。 在手征极限下，其中一种模式的激发能量与当前夸克质量成比例，并且该模式满足当前代数求和规则。 这与当前代数对同位旋不对称介质的预测一致。 显示英文摘要

摘要： Pionic excitations are analyzed in isospin-asymmetric Fermi gas of constituent quarks. It is found that in addition to the usual pionic excitations, there exists a very low collective mode with quantum numbers of the charged pion (spin-isospin sound). In the chiral limit the excitation energy of one of the modes scales as the current quark mass, and the mode saturates current-algebraic sum rules. This is in agreement with predictions of current algebra for isospin-asymmetric medium.