Multi-black holes solution with cosmic strings

Some black hole-cosmic string models such as Reissner-Nordstrom, RN-de Sitter, Kerr-Newman and multi-black holes with cosmic string are given. Energy and angular momentum of a timelike particle in circular orbits in multi-black hole space-time are calculated. The geodesic equations for the timelike particles for the far region of the multi-black hole sources are calculated and small oscillations around the circular orbit obtained. It is seen that the particle's orbit precesses like the Lens-Thirring effect.