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Résumé |
Cosmic strings arise as remnants of phase transitions in the early Universe, often
related to theories of grand unification (GUTs). If such a phase transitions
occurs at high energies, the resulting cosmic string network generates a sizable
amount of gravitational waves. Most work so far has focused on the gravitational
wave signal from topologically stable cosmic strings. In this talk I will
introduce metastable cosmic strings, which are a generic consequence of many GUTs.
I will discuss how this idea can be probed in various ongoing and upcoming
gravitational wave experiments, from pulsar timing arrays to space- and ground-
based interferometers. In the final part of my talk I will discuss a recent
proposal on using the radio telescopes to probe this and other sources of ultra
high frequency gravitational waves. |
