Holographic phase transitions at finite baryon density
Holographic phase transitions at finite baryon density
复制标题
DOI：
10.1088/1126-6708/2007/02/016
复制
发表时间：
2006-11
影响因子：
5.4
通讯作者：
Shinpei Kobayashi;D. Mateos;S. Matsuura;R. Myers;R. Thomson
中科院分区：
文献类型：
--
作者：
Shinpei Kobayashi;D. Mateos;S. Matsuura;R. Myers;R. Thomson
我们用全息技术研究了在有限温度和重子密度下耦合到基本物质Nf << Nc味的SU（Nc）超杨-米尔斯理论。我们专注于四维，其中的对偶描述包括Nf的D 7-膜的背景下的Nc黑D3-膜，但我们的结果适用于其他维度以及。通过非零世界体积规范场在D 7-膜上引入非零化学势μB或重子数密度nb。参考文献[1]确定了与介子“熔化”有关的零密度下的一级相变。这延伸到小nb的相变线，其终止于有限nb的临界点。对D 7-膜热力学的研究表明，在相图的一个小区域内，（μB/μ nb）T<0，表明不稳定。我们对这一地区可能出现的新阶段作出评论。
We use holographic techniques to study SU(Nc) super Yang-Mills theory coupled to Nf << Nc flavours of fundamental matter at finite temperature and baryon density. We focus on four dimensions, for which the dual description consists of Nf D7-branes in the background of Nc black D3-branes, but our results apply in other dimensions as well. A non-zero chemical potential μb or baryon number density nb is introduced via a nonvanishing worldvolume gauge field on the D7-branes. Ref. [1] identified a first order phase transition at zero density associated with `melting' of the mesons. This extends to a line of phase transitions for small nb, which terminates at a critical point at finite nb. Investigation of the D7-branes' thermodynamics reveals that (∂μb/∂nb)T<0 in a small region of the phase diagram, indicating an instability. We comment on a possible new phase which may appear in this region.