Yu Wang

Quasinormal modes of a Kerr black hole embedded in a King-type cored dark matter halo

Yu Wang, Meilin Liu, Haiguang Xu

Abstract We investigate scalar quasinormal modes of a Kerr black hole immersed in a King-type cored dark matter halo within the slow-rotation approximation. Starting from a static King density profile, we construct the rotating spacetime via the Newman–Janis algorithm and derive the …

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Stability of Circular Orbits Around Kerr Black Holes Immersed in a Dehnen-Type Dark Matter Halo

Yu Wang, Meilin Liu, Haiguang Xu

We investigate the dynamical stability of circular orbits around a Kerr black hole embedded in a Dehnen-type dark matter halo. The effective spacetime metric of the combined system is constructed using the Newman–Janis algorithm, and the effective potential for test-particle motion in …

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Distinguishing Strongly Interacting Dark Matter Spikes via EMRI Gravitational Waves

Yu Wang, Wen-Biao Han, En‐Wei Liang

We investigate the potential of extreme mass ratio inspirals (EMRIs) as probes of strongly interacting dark matter (SIDM) spikes around supermassive black holes. Based on Lagrangian formulations of dark matter self-interactions, we analyze the effects of number changing processes, such as 2→0 …

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Shadows of three black holes in static equilibrium configuration

Dan Li, Yuxiang Zuo, Shiyang Hu, Chen Deng et autres

Abstract In this paper, we employ a ray-tracing algorithm to simulate the shadows of three equal-mass black holes in static equilibrium across a wide parameter space. We find that the shadows consist of a larger primary shadow and several distorted, eyebrow-like secondary …

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Gravitational wave imprints of dark matter annihilation: probing halo structures through EMRI signals

Yu Wang, Wen-Biao Han, Xin Wu, E. P. T. Liang

Abstract Gravitational waves (GWs), as potential probes of dark matter halos, have received much attention recently. This paper investigates how the annihilation channels of dark matter particles—namely s-wave, p-wave, and d-wave—influence the spatial distribution characteristics of dark matter halos, thereby leaving observable …

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Shadows of three black holes in static equilibrium configuration

Dan Li, Yuxiang Zuo, Shiyang Hu, Chen Deng et autres

In this paper, we employ a ray-tracing algorithm to simulate the shadows of three equal-mass black holes in static equilibrium across a wide parameter space. We find that the shadows consist of a larger primary shadow and several distorted, eyebrow-like secondary shadows. …

Stability Analysis of Stable Circular Orbit in Multi-Static Black Hole Spacetime

Zefang Fan, Yu Wang, Xiang-Gao Wang

We herein study the circular orbit stability of a static black hole system composed of multiple Reissner–Nordstrom (RN) black holes. By comparing the circular orbits of two static black holes, three static black holes (TBHs), four static black holes and five static …

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Temperature-Dependent Double Exciton Competition Emission in One Dimensional Copper-Based Organic–Inorganic Hybrid Perovskites

Yu Wang, Shuai Zhang, Bingsuo Zou, Ruosheng Zeng

Organic–inorganic hybrid perovskites with temperature-dependent dual emission are attracting more attention due to their promising application in fluorescence intensity ratio technology. Herein, we report a Cu-based organic–inorganic hybrid perovskite (BDA)Cu 2 Br 4 (BDA = C 4 H 12 N 2 2+ …

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The Space-Time Properties of Three Static Black Holes

Yu Wang, Gangqi Shen, Xin Sun

In the curved space-time, the neutral test particle is not affected by any other force except for the influence of the curved space-time. Similar to the free sub in the flat space, the Lagrangian of the test particle only contains the kinetic …

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Space-Time Properties of Extreme RN Black Holes in Static Triangular Distribution

Gangqi Shen, Yu Wang, Hou-Jun Lü

We studied the space-time properties of the triangular symmetric black hole in the case of extreme RN black hole. Because the neutral test particle is only affected by space-time in the curved space-time, we chose the triangular symmetric black hole as the …

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Dynamics of Charged Particles Moving around Kerr Black Hole with Inductive Charge and External Magnetic Field

Xin Sun, Xin Wu, Yu Wang, Chen Deng et autres

We mainly focus on the effects of small changes of parameters on the dynamics of charged particles around Kerr black holes surrounded by an external magnetic field, which can be considered as a tidal environment. The radial motions of charged particles on …

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[Effect of moxibustion on acupoints at "opening" time on telomere length and expression of liver cell cycle regulators in aging rats].

Yu Wang, Jianhao Yang, Cai-Jiao Zhao

OBJECTIVE: To observe the effects of "lingguibafa" moxibustion performing at the appropriate acupoints at their "opening" time on telomere length，expressions of p53 of tumor supressor genes and retinoblastoma gene(Rb)in the liver of aging rats，so as to explore its mechanisms underlying delaying senescence. …

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