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00925njm 22002777a 4500 dc Ruiz Ruiz, Fernando author Gibbons, G.W. author Ortiz, M.E. author 1990-04-19 It is shown that any sigma model coupled to gravity with a target space having closed geodesics admits singular cosmic string solutions with event horizons. We also prove that if one makes the general assumption of boost symmetric sources, non-singular solutions of this type cannot exist. The case of the target manifold being the fundamental domain of the modular group PSL(2,¢Z) is discussed in detail. 0370-2693 10.1016/0370-2693(90)90407-W https://hdl.handle.net/20.500.14352/59055 http://dx.doi.org/10.1016/0370-2693(90)90407-W http://www.sciencedirect.com Stringy cosmic strings with horizons