Current algebra and soft pionic modes in asymmetric quark matter

Details Current algebra and soft pionic modes in asymmetric quark matter Current algebra and soft pionic modes in asymmetric quark matter

1996-09-24

arxiv.org/abs/nucl-th/9609053v2

Phys.Lett. B392 (1997) 267-272

Physics

Nuclear Physics

Nuclear Theory

version accepted in Phys. Lett. B, 12 pages

Scientific paper

10.1016/S0370-2693(96)01551-1

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.

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