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arXiv 0802.0568hep-th
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全息介质QCD中的重子质量

Baryon Mass in medium with Holographic QCD

Yunseok Seo, Sang-Jin Sin

摘要:

利用DBI作用量和探测膜与重子顶点之间的力平衡条件,研究了介质存在下的重子顶点。我们注意到,一个稳定的BV配置只存在于一些限制背景。对于有限密度系统,问题在于介质中的重子质量是否存在正则定义。在这项工作中,我们定义它为变形BV的能量满足力平衡条件(FBC)与探针膜。对于FBC,连接到BV的弦的长度趋于零,而紧膜被拉长以模仿弦。我们把探测膜的形变能归因于重子-重子相互作用。结果表明,对于重夸克系统,重子质量随密度单调下降,而对于轻夸克系统,重子质量有极小值。

英文摘要:

We study the baryon vertex (BV) in the presence of medium using DBI action and the force balance condition between BV and the probe branes. We note that a stable BV configuration exists only in some of the confining backgrounds. For the system of finite density, the issue is whether there is a canonical definition for the baryon mass in the medium. In this work, we define it as the energy of the deformed BV satisfying the force balance condition (FBC) with the probe brane. With FBC, lengths of the strings attached to the BV tend to be zero while the compact branes are enlongated to mimic the string. We attribute the deformation energy of the probe brane to the baryon-baryon interaction. We show that for a system with heavy quarks the baryon mass drops monotonically as a function of density while it has minimum in case of light quark system.

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