Dynamics of Gravitating Magnetic Monopoles

Abstract

According to previous work on magnetic monopoles, static regular solutions are nonexistent if the vacuum expectation value of the Higgs field $\eta$ is larger than a critical value ${\eta }_{\mathrm{cr}}$, which is of the order of the Planck mass. In order to understand the properties of monopoles for $\eta >{\eta }_{\mathrm{cr}}$, we investigate their dynamics numerically. If $\eta$ is large enough ($\gg {\eta }_{\mathrm{cr}}$), a monopole expands exponentially and a wormhole structure appears around it, regardless of coupling constants and initial configuration. If $\eta$ is around ${\eta }_{\mathrm{cr}}$, there are three types of solutions, depending on coupling constants and initial configuration: a monopole either expands as stated above, collapses into a black hole, or comes to take a stable configuration.

11 pages, revtex, postscript figures; results for various initial conditions are added; to appear in Phys. Rev. D

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