Seminarium "Teoria cząstek elementarnych i kosmologia"

Cosmic strings are a common prediction in many grand unified theories and a promising source of stochastic gravitational waves (GWs) from the early Universe. If strings are produced at a comparatively low energy scale, v ≲ 10^9 GeV, their GW signal exhibits, as I will discuss in this talk, several novel features that are not present in the case of high-scale cosmic strings, including: (i) a sharp cutoff frequency f_cut in the GW spectrum from the fundamental oscillation mode on closed string loops and (ii) an oscillating pattern in the total GW spectrum from all oscillation modes whose local minima are located at integer multiples of f_cut. I will explain the physical origin of these features and illustrate how they can be leveraged to directly probe the discrete spectrum of oscillation modes on closed string loops with future GW observatories such as BBO and DECIGO.
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