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The emission and absorption of gravitational waves and massless particles ofan infinitely long straight cosmic string with finite thickness are studied. Itis shown in a general term that the back reaction of the emission andabsorption {\em always} makes the symmetry axis of the string singular. Thesingularity is a scalar singularity and cannot be removed.Comment: To appear in Gen. Relativ. Gra

Letter: On the Back Reaction of Gravitational and Particle Emission and Absorption from Straight Thick Cosmic Strings: A Toy Model