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A network of cosmic strings would lead to gravitational waves which may bedetected by pulsar timing or future interferometers. The details of thegravitational wave signal depend on the distribution of cosmic string loops,which are produced by intercommutations from the scaling network of longstrings. We analyze the limits imposed by energy conservation, i.e., by thefact that the total amount of string flowing into loops cannot exceed theamount leaving the long strings. We show that some recent suggestions for thecosmic string loop production rate and distribution are ruled out by theselimits. As a result, gravitational waves based on such suggestions, inparticular "model 3" used in LIGO data analysis, are not to be expected.

Energy-conservation constraints on cosmic string loop production and distribution functions