EXISTENCE OF DOUBLE VORTEX SOLUTIONS

We show analytically and numerically the existence of double vortex so lutions in two-Higgs systems. These solutions are generalizations of t he Nielsen-Olesen vortices and exist for all values of the parameters in the Lagrangians considered. We derive analytically the asymptotic b ehavior of the solutions and confirm it numerically by solving the fie ld equations. Finally, we show that these solutions can be embedded in realistic theories like the two-doublet extension of the standard mod el.