Rho meson condensation at finite isospin chemical potential in a holographic model for QCD

被引：73

作者：

Aharony, Ofer ^{[1
]}

Peeters, Kasper ^{[2
]}

Sonnenschein, Jacob ^{[3
,4
]}

Zamaklar, Marija ^{[5
]}

机构：

[1] Weizmann Inst Sci, Dept Particle Phys, IL-76100 Rehovot, Israel

[2] Univ Utrecht, Inst Theoret Phys, NL-3508 TD Utrecht, Netherlands

[3] Tel Aviv Univ, Sch Phys & Astron, Raymond & Beverly Sackler Fac Exact Sci, IL-69978 Tel Aviv, Israel

[4] Weizmann Inst Sci, Albert Einstein Minerva Ctr, IL-76100 Rehovot, Israel

[5] Univ Durham, Dept Math Sci, Durham DH1 3LE, England

来源：

JOURNAL OF HIGH ENERGY PHYSICS | 2008年 / 02期

关键词：

chiral Lagrangians; gauge-gravity correspondence;

D O I：

10.1088/1126-6708/2008/02/071

中图分类号：

O412 [相对论、场论]; O572.2 [粒子物理学];

学科分类号：

摘要：

We analyze the effect of an isospin chemical potential mu(I) in the Sakai-Sugimoto model, which is the string dual of a confining gauge theory related to large N-c QCD, at temperatures below the chiral symmetry restoration temperature. For small chemical potentials we show that the results agree with expectations from the low-energy chiral Lagrangian, and the charged pion condenses. When the chemical potential reaches a critical value mu(I) = mu(crit) similar to 1.7m(p), the lowest vector meson ( the "rho meson") becomes massless, and it condenses ( in addition to the pion condensate) for mu(I) > mu(crit). This spontaneously breaks the rotational symmetry, as well as a residual U( 1) flavor symmetry. We numerically construct the resulting new ground state for mu(I) > mu(crit).

引用

页数：34