The gravitational field of a global monopole
The authors present an exact solution to the non-linear equation which describes a global monopole in the flat space. They re-examine the metric and the geodesics outside the global monopole. They show that a global monopole produces a repulsive gravitational field outside the core in addition to a solid anglar deficit. The lensing property of the global monopole and the global monopole-antimonopole annihilation mechanism are studied.