Massive Nambu-Goldstone Bosons

被引：55

作者：

Watanabe, Haruki ^{[1
]}

Brauner, Tomas ^{[2
,3
]}

Murayama, Hitoshi ^{[1
,4
,5
]}

机构：

[1] Univ Calif Berkeley, Dept Phys, Berkeley, CA 94720 USA

[2] Univ Bielefeld, Fac Phys, D-33615 Bielefeld, Germany

[3] Nucl Phys Inst ASCR, Dept Theoret Phys, Rez 25068, Czech Republic

[4] Univ Calif Berkeley, Lawrence Berkeley Natl Lab, Theoret Phys Grp, Berkeley, CA 94720 USA

[5] Univ Tokyo, Todai Inst Adv Study, Kavli Inst Phys & Math Universe WPI, Kashiwa, Chiba 2778583, Japan

来源：

PHYSICAL REVIEW LETTERS | 2013年 / 111卷 / 02期

基金：

美国国家科学基金会;

关键词：

SPONTANEOUS SYMMETRY-BREAKING; CONDENSATION; QCD;

D O I：

10.1103/PhysRevLett.111.021601

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Nicolis and Piazza have recently pointed out the existence of Nambu-Goldstone-like excitations in relativistic systems at finite density, whose gap is exactly determined by the chemical potential and the symmetry algebra. We show that the phenomenon is much more general than anticipated and demonstrate the presence of such modes in a number of systems from (anti) ferromagnets in a magnetic field to superfluid phases of quantum chromodynamics. Furthermore, we prove a counting rule for these massive Nambu-Goldstone bosons and construct a low-energy effective Lagrangian that captures their dynamics.

引用

页数：5