7 papers
Analysis of minimum orbital periods around d-dimensional charged black holes
Yan Peng, Guohua Liu
This paper investigates the bounds on the minimum orbital period for test objects around d-dimensional charged black holes in asymptotically flat spacetimes. We derive the exact cr…
Bounds on the minimum orbital period in the background of 5-dimensional charged black holes
Yan Peng
In this paper, we study the upper and lower bounds on the minimum orbital period of 5-dimensional charged black holes. Our results indicate that the upper bound of the minimum orbi…
Bounds on the minimum orbital period of four-dimensional black holes: From singular to non-singular spacetimes
Guohua Liu, Yan Peng, Hua Huang +1
It was conjectured that the lower bound may be a universal property of four-dimensional black holes, where is the black hole mass and is the mini…
An upper bound on the minimum orbital period of black holes
Yan Peng
Previous research has focused on establishing lower bounds on the minimum orbital period of black holes. In this work, we explore the complementary question of whether an upper bou…
Lower bound on the orbital period of Kerr-Newman black holes
Yan Peng
Based on the orbital period of Kerr black holes, Hod proposed a conjecture that a general lower bound on the orbital period may exist. In this work, we examined this bound by explo…
Upper bound on the radius of the innermost photonsphere in the regular compact star spacetime
Guohua Liu, Yan Peng
We study properties of the innermost photonsphere in the regular compact star background. We take the traceless energy-momentum tensor and dominant energy conditions. In the regula…
Analytical investigations on the Maxwell electromagnetic invariant in the spinning and charged horizonless star background
Yan Peng
We study properties of the Maxwell electromagnetic invariant in the external region of spinning and charged horizonless stars. We analytically find that the minimum negative value…