Time-like geodesic structure of a spherically symmetric black hole in the brane-world

• Published in: Chinese physics B 2011-10, Vol.20 (10), p.96-100
• Main Authors: Zhou, Sheng (盛周), Chen, Ju-Hua (菊华 陈), Wang, Yong-Jiu (永久 王)
• Format: Article
• Language: English
• Subjects: Black holes (astronomy); Cosmological constant; Dark matter; Galaxies; Initial conditions; Mathematical analysis; Orbits; Singularities; 世界; 宇宙常数; 时间; 测地线; 球对称黑洞; 粒子约束; 线结构; 膜
• ISSN: 1674-1056; 2058-3834
• DOI: 10.1088/1674-1056/20/10/100401

Recently Malihe Heydari-Fard obtained a spherically symmetric exterior black hole solution in the brane-world scenario, which can be used to explain the galaxy rotation curves without postulating dark matter. By analysing the particle effective potential, we have investigated the time-like geodesic structure of the spherically symmetric black hole in the brane-world. We mainly take account of how the cosmological constant α and the stellar pressure β affect the time-like geodesic structure of the black hole. We find that the radial particle falls to the singularity from a finite distance or plunges into the singularity, depending on its initial conditions. But the non-radial time-like geodesic structure is more complex than the radial case. We find that the particle moves on the bound orbit or stable （unstable） circle orbit or plunges into the singularity, or reflects to infinity, depending on its energy and initial conditions. By comparing the particle effective potential curves for different values of the stellar pressureβ and the cosmological constant α, we find that the stellar pressure parameter β does not affect the time-like geodesic structure of the black hole, but the cosmological constant a has an impact on its time-like geodesic structure.