Gravitational power from cosmic string loops with many kinks

Abstract

We investigate the effect of a large number of kinks on the gravitational power radiated by cosmic string loops. We show that the total power radiated by a loop with N left-moving and right-moving kinks is proportional to N and increases with the typical kink angle. We then apply these results to loops containing junctions which give rise to a proliferation of the number of sharp kinks. We show that the time of gravitational decay of these loops is smaller than previously assumed. In light of this we revisit the gravitational wave burst predictions from a network containing such loops. We find there is no parameter regime in which the rate of individual kink bursts is enhanced with respect to standard networks. By contrast, there remains a region of parameter space for which the kink-kink bursts dominate the stochastic background. Finally, we discuss the order of magnitude of the typical number of sharp kinks resulting from kink proliferation on loops with junctions.

20 pages, 1 figure

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Cited by in corpus (7)

• Cosmological Backgrounds of Gravitational Waves and eLISA/NGO: Phase Transitions, Cosmic Strings and Other Sources
• eLISA: Astrophysics and cosmology in the millihertz regime
• Forecast constraints on cosmic string parameters from gravitational wave direct detection experiments
• Forecast constraints on cosmic strings from future CMB, pulsar timing and gravitational wave direct detection experiments
• Gravitational backreaction on a cosmic string: Formalism
• Cosmic Super-Strings and Kaluza-Klein Modes
• Cosmic superstring networks with Y-junctions: Evolution, B-modes and Gravitational waves