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arXiv 2204.09006gr-qc
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基于李雅普诺夫指数的非对易Schwarzschild黑洞的测地稳定性和拟正规模

Geodesic stability and quasinormal modes of non-commutative Schwarzschild black hole employing Lyapunov exponent

Shobhit Giri, Hemwati Nandan, Lokesh Kumar Joshi, Sunil D. Maharaj

摘要:

研究了非对易几何Schwarzschild黑洞时空(NCSBH)引力场的试验粒子动力学和圆测地线的稳定性。坐标时间李雅普诺夫指数($λ_{c}$)是研究有质量和无质量试验粒子赤道圆测地线稳定性的关键。通过分析不同非对易参数($α$)下圆轨道的李雅普诺夫指数随半径的变化,讨论了圆轨道的稳定性和不稳定性.在零圆轨道的情况下,计算并给出了不稳定指数,讨论了零圆轨道的不稳定性。此外,通过相关的参数对应于零圆测地线(即角频率和李雅普诺夫指数),准正规模式(QNM)的无质量标量场扰动的程函近似进行评估,并通过相关的实部和虚部也可视化。通过改变非对易参量($α$)和微扰角动量($l$),观察和讨论了标量场势的性质。

英文摘要:

We study the dynamics of test particle and stability of circular geodesics in the gravitational field of a non-commutative geometry inspired Schwarzschild black hole spacetime (NCSBH). The coordinate time Lyapunov exponent ($λ_{c}$) is crucial to investigate the stability of equatorial circular geodesics of massive and massless test particles. The stability or instability of circular orbits are discussed by analysing the variation of Lyapunov exponent with radius of these orbits for different values of non-commutative parameter ($α$). In the case of null circular orbits, the instability exponent is calculated and presented to discuss the instability of null circular orbits. Further, by relating parameters corresponding to null circular geodesics (i.e. angular frequency and Lyapunov exponent), the quasinormal modes (QNMs) for a massless scalar field perturbation in the eikonal approximation are evaluated, and also visualised by relating the real and imaginary parts. The nature of scalar field potential, by varying the non-commutative parameter ($α$) and angular momentum of perturbation ($l$), are also observed and discussed.

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