Loading…
Chiral condensate in neutron matter
A recent chiral perturbation theory calculation of the in-medium quark condensate 〈q¯q〉 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...
Saved in:
Published in: | Physics letters. B 2009-01, Vol.671 (1), p.25-29 |
---|---|
Main Authors: | , |
Format: | Article |
Language: | English |
Subjects: | |
Citations: | Items that this one cites Items that cite this one |
Online Access: | Get full text |
Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
Summary: | A recent chiral perturbation theory calculation of the in-medium quark condensate 〈q¯q〉 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 2π-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¯q〉(ρn) in the chiral limit mπ→0. |
---|---|
ISSN: | 0370-2693 1873-2445 |
DOI: | 10.1016/j.physletb.2008.11.071 |