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Motivated by their effect on the gravitational wave signal emitted by cosmicstrings, we study the dynamics of kinks on strings of different tensionsmeeting at junctions. The propagation of a kink through a Y-junction leads tothe formation of three `daughter' kinks. Assuming a uniform distribution of theincoming wave vectors at the junction, we find there is a significant region ofconfiguration space in which the sharpness of at least one of the daughterkinks is enhanced relative to the sharpness of the initial kink. For closedloops with junctions we show this leads to an exponential growth in time ofvery sharp kinks. Using numerical simulations of realistic, evolving cosmicstring loops with junctions to calculate the distribution of kink amplitudes asa function of time, we show that loops of this kind typically develop severalorders of magnitude of very sharp kinks before the two junctions collide. Thiscollision, or other effects such as gravitational backreaction, may end theproliferation.

Proliferation of sharp kinks on cosmic (super-)string loops with junctions