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arXiv 1712.07587gr-qcastro-ph.SR
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信息熵方法:恒星的稳定性和修正的引力理论

Information-Entropic Method: Stability of Stars and Modified Gravity Theories

C. Wibisono, A. Sulaksono

摘要:

我们在两个修正的引力理论中研究了非相对论性多变星的稳定性,除了Horndeski引力和Eddington启发了Born Infeld理论使用配置熵方法。我们从恒星有效方程出发,采用空间定域的能量密度有界函数作为解,构造了相应的组态熵。我们使用与参考文献作者相同的论证。[1,2]证明了如果组态熵随绝热指数曲线的变化存在峰值,则恒星是稳定的。具体地说,对应于Ekrasekhar稳定性界的稳定区和不稳定区之间的边界由最大峰的存在指示,而最稳定的多变星由相应曲线中的最小峰指示。我们发现,Beyond Horndeski引力理论和Eddington Born Infeld理论的非相对论极限所预言的Krasekhar稳定界临界绝热指数和最稳定多变星的临界绝热指数与广义相对论所预言的临界绝热指数不同,其差别取决于两种理论的自由参数。

英文摘要:

We study the stability of non-relativistic polytropic stars within two modified gravity theories i.e., Beyond Horndeski gravity and Eddington inspired Born Infeld theories using the configuration entropy method. We use spatially localized bounded function of energy density as solutions from stellar effective equations to construct the corresponding configuration entropy. We use the same argument as the one used by the authors of Refs. [1,2] that the stars are stable if there is peak in configuration entropy as a function of adiabatic index curve. Specifically, the boundary between stable and unstable regions which corresponds to Chandrasekhar stability bound is indicated from the existence of the maximum peak while the most stable polytropic stars is indicated by minimum peak in the corresponding curve. We have found that the value of critical adiabatic indexes of Chandrasekhar stability bound and the most stable polytropic stars predicted by non-relativistic limit of Beyond Horndeski Gravity and Eddington inspired Born Infeld theories are different to those predicted by general relativity where the corresponding differences depend on the free parameter of both theories.

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