Stability of strange star crusts and strangelets
Stability of strange star crusts and strangelets
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DOI：
10.1103/physrevd.73.114016
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发表时间：
2006-04
影响因子：
5
通讯作者：
M. Alford;K. Rajagopal;S. Reddy;A. Steiner
中科院分区：
文献类型：
--
作者：
M. Alford;K. Rajagopal;S. Reddy;A. Steiner
我们考虑了包括德拜屏蔽在内的静电效应和真空与夸克物质界面的任意表面张力{sigma}，构造了奇异态。我们发现存在一个临界表面张力{sigma}{subcrit}，低于这个值大的奇异粒子对碎裂是不稳定的，低于这个临界表面张力的夸克星表面将碎裂成由浸在电子气中的带电奇异粒子构成的结晶壳。我们导出了一个与模型无关的关系，它与表征任意夸克物质状态方程的两个参数之间的关系。对于合理的模型状态方程，我们发现{sigma}{subcrit}通常只有几个MeV/Fm{sup 2}。如果{sigma}{<；=}{sigma}{subcrit}，则宇宙线中奇异粒子的大小分布可能具有一个与我们构建的稳定奇异粒子相对应的峰。
We construct strangelets, taking into account electrostatic effects, including Debye screening, and arbitrary surface tension {sigma} of the interface between vacuum and quark matter. We find that there is a critical surface tension {sigma}{sub crit} below which large strangelets are unstable to fragmentation and below which quark star surfaces will fragment into a crystalline crust made of charged strangelets immersed in an electron gas. We derive a model-independent relationship between {sigma}{sub crit} and two parameters that characterize any quark matter equation of state. For reasonable model equations of state, we find {sigma}{sub crit} typically of order a few MeV/fm{sup 2}. If {sigma}{<=}{sigma}{sub crit}, the size-distribution of strangelets in cosmic rays could feature a peak corresponding to the stable strangelets that we construct.