Speaker
Dr
Hocheol Lee
(Dongguk University)
Description
In this talk, I will introduce the innermost stable circular orbit (ISCO) in higher-dimensional, static, spherically symmetric, asymptotically flat black holes with anisotropic energy-momentum tensors. Assuming the weak energy condition, a non-positive trace, and constrained radial and tangential pressures, we analyze timelike geodesics via the effective potential. We show that, unlike in four dimensions, the ISCO radius in higher dimensions admits no upper bound, and for spacetime dimensions, greater than or equal to 8, an ISCO may not exist at all.
