Cosmic String Dynamics and Evolution in Warped Spacetime

Understand

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.