Dymnikova黑洞浸于完美流体暗物质和弦云中：霍金温度、动力学和QPOs分析
Dymnikova Black Hole Immersed in Perfect Fluid Dark Matter and a Cloud of Strings: Hawking Temperature, Dynamics and QPOs Analysis
AI总结：
本文研究了浸于完美流体暗物质和弦云中的广义Dymnikova黑洞，分析其霍金温度、动力学及QPOs特性，探讨参数对黑洞阴影和强场结构的影响。
摘要：
Dymnikova黑洞代表一个正则时空解，介于de Sitter核心和渐近Schwarzschild几何之间。在本工作中，我们研究了一个广义的Dymnikova黑洞，其周围被完美流体暗物质（PFDM）包围，并浸于弦云（CS）中。我们分析这些额外物质源如何修改时空的热力学、光学和动力学性质。我们推导出霍金温度和特定热容量，并研究黑洞的热稳定性和相结构。结果揭示了非单调温度行为和参数依赖的相变。我们进一步研究光子动力学，包括光子球和黑洞阴影，并表明PFDM和弦云参数显著影响阴影半径和强场结构。此外，我们研究了质量测试粒子的运动、圆轨道和稳定性条件。相应的有效势、特定能量和角动量被分析。最后，我们通过计算基本二次谐波频率来探索准周期振荡（QPOs），并讨论模型参数如何编码可观测的天体物理特征。
英文摘要：
The Dymnikova black hole represents a regular spacetime solution interpolating between a de Sitter core and an asymptotically Schwarzschild geometry. In this work, we investigate a generalized Dymnikova black hole surrounded by perfect fluid dark matter (PFDM) and immersed in a cloud of strings (CS). We analyze how these additional matter sources modify the thermodynamic, optical, and dynamical properties of the spacetime. We derive the Hawking temperature and specific heat capacity and examine the thermal stability and phase structure of the black hole. The results reveal non-monotonic temperature behavior and parameter-dependent phase transitions. We further study photon dynamics, including the photon sphere and black hole shadow, and show that both PFDM and string cloud parameters significantly affect the shadow radius and strong-field structure. Additionally, we investigate the motion of massive test particles, circular orbits, and stability conditions. The corresponding effective potentials, specific energy, and angular momentum are analyzed. Finally, we explore quasi-periodic oscillations (QPOs) by computing the fundamental epicyclic frequencies and discuss how the model parameters encode observable astrophysical signatures.
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