Application of Sturm's theorem to marginal stable circular orbits of a test body in spherically symmetric and static spacetimes

Toshiaki Ono, Tomohito Suzuki, Naomasa Fushimi +2

In terms of Sturm's theorem, we reexamine a marginal stable circular orbit (MSCO) such as the innermost stable circular orbit (ISCO) of a timelike geodesic in any spherically symme…