Nonextensive Theory of Dark Matter and Gas Density Profiles
Nonextensive Theory of Dark Matter and Gas Density Profiles
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DOI：
10.1086/497620
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发表时间：
2005-09
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影响因子：
--
通讯作者：
M. Leubner
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文献类型：
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作者：
M. Leubner
在松弛星系和星系团中观察到的暗物质和气体密度分布的明显核心晕模式迄今为止都符合经验幂律。另一方面，类似的功能是众所周知的天体物理等离子体环境，受到远程相互作用，在非广泛的熵概括的背景下建模。我们链接非广泛的统计问题的密度分布在大尺度结构，并提供从根本上推导的密度分布，准确地代表暗物质和热等离子体分布的特性，观察到或模拟中产生的。密度分布分叉成动力学暗物质/热力学气体分支是理论的自然结果，并且由单个参数κ控制，物理上测量系统内的耦合程度。因此，它建议有利于非广泛的分布，来自熵的泛化和占非局域性和长距离相互作用的引力耦合系统的基本物理背景下，在建模观测到的密度分布的天体物理结构。
Pronounced core-halo patterns of dark matter and gas density profiles, observed in relaxed galaxies and clusters, were hitherto fitted by empirical power laws. On the other hand, similar features are well known from astrophysical plasma environments, subject to long-range interactions, modeled in the context of a nonextensive entropy generalization. We link nonextensive statistics to the problem of density distributions in large-scale structures and provide fundamentally derived density profiles, representing accurately the characteristics of both dark matter and hot plasma distributions as observed or generated in simulations. The bifurcation of the density distribution into a kinetic dark matter/thermodynamic gas branch turns out to be a natural consequence of the theory and is controlled by a single parameter, κ, measuring physically the degree of coupling within the system. Consequently, it is proposed to favor nonextensive distributions, derived from the fundamental physical context of entropy generalization and accounting for nonlocality and long-range interactions in gravitationally coupled systems, when modeling observed density profiles of astrophysical structures.