Cosmic String Dynamics and Evolution in Warped Spacetime

Abstract

We study the dynamics and evolution of Nambu-Goto strings in a warped spacetime, where the warp factor is a function of the internal coordinates giving rise to a `throat' region. The microscopic equations of motion for strings in this background include potential and friction terms, which attract the strings towards the bottom of the warping throat. However, by considering the resulting macroscopic equations for the velocities of strings in the vicinity of the throat, we note the absence of enough classical damping to guarantee that the strings actually reach the warped minimum and stabilise there. Instead, our classical analysis supports a picture in which the strings experience mere deflections and bounces around the tip, rather than strongly damped oscillations. Indeed, 4D Hubble friction is inefficient in the internal dimensions and there is no other classical mechanism known, which could provide efficient damping. These results have potentially important implications for the intercommuting probabilities of cosmic superstrings.

21 pages, 5 figures; Discussion section expanded, physical implications further explored; To appear in PRD

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• Scaling configurations of cosmic superstring networks and their cosmological implications
• The effect of extra dimensions on gravity wave bursts from cosmic string cusps
• Cosmic string evolution with a conserved charge
• String Necklaces and Primordial Black Holes from Type IIB Strings
• Detection of Low Tension Cosmic Superstrings
• Cosmic Super-Strings and Kaluza-Klein Modes
• Cosmic superstrings in large volume compactifications: PTAs, LISA and time-varying tension
• Cosmic superstring trajectories in warped compactifications