Chiral condensate in neutron matter

A recent chiral perturbation theory calculation of the in-medium quark condensate ((q) over barq) is extended to the isospin-asymmetric case of pure neutron matter. In contrast to the behavior in isospin-symmetric nuclear matter we find only small deviations from the linear density approximation. This feature originates primarily from the reduced weight factors (e.g. 1/6 for the dominant contributions) of the 2 pi-exchange mechanisms in pure neutron matter. Our result Suggests therefore that the tendencies for chiral symmetry restoration are actually favored in systems with large neutron excess (e.g. neutron stars). We also analyze the behavior of the density-dependent quark condensate ((q) over barq)(p(n)) in the chiral limit m(pi)-> 0. (C) 2008 Elsevier B.V. All rights reserved.