The evolution of circular loops of a cosmic string with periodic tension

Abstract

In this paper the equation of circular loops of cosmic string with periodic tension is investigated in the Minkowski spacetime and Robertson-Walker universe respectively. We find that the cosmic string loops possessing this kind of time-varying tension will evolve to oscillate instead of collapsing to form a black hole if their initial radii are not small enough.

9 pages, 3 figures

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• String loops in the field of braneworld spherically symmetric black holes and naked sigularities
• Photon motion in Kerr-de Sitter spacetimes
• Cosmic (super)strings with a time-varying tension
• Test of the string loop oscillation model using kHz quasiperiodic oscillations in a neutron star binary
• Dark matter halos modeled by polytropic spheres influenced by the relict cosmological constant and trapping polytropes forming supermassive black holes