MG15 - Talk detail

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Abstract

Cosmic strings have been considered to be a possible source of gravitational waves (GW) of cosmological origin. If they really exist, they can probe very early Universe before the last-scattering surface. Naively thinking, the amplitude of GWs from cosmic strings is basically determined from their tension, the linear mass density. From the field-theoretic viewpoint, a cosmic string is a linear solitonic object of a complex scalar field or two real scalar fields. Hence the amplitude of GWs could be depending on the details of interactions involving such scalar fields. In the Abelian-Higgs model, there is the gauge interaction between a complex scalar field and its associated gauge field, and in the superconducting string model, the scalar field supporting strings interacts with another scalar field which is condensed on the string. In this talk, we show the variation of GW amplitudes in the Abelian-Higgs model and superconducting strings model according to the three-dimensional field-theoretic simulations, and discuss the ability of classification among different models from the GW spectra.

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