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Cosmic strings from preheating

I. Tkachev·S. Khlebnikov·L. Kofman·A. Linde
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Abstract

We investigate nonthermal phase transitions that may occur after post-inflationary preheating in a simple model of a two-component scalar field with the effective potential $λ(ϕ_i^2 - {\rm v}^2)^2/4$, where $ϕ_1$ is identified with the inflaton field. We use three-dimensional lattice simulations to investigate the full nonlinear dynamics of the model. Fluctuations of the fields generated during and after preheating temporarily make the effective potential convex in the $ϕ_1$ direction. The subsequent nonthermal phase transition with symmetry breaking leads to formation of cosmic strings even for ${\rm v} \gg 10^{16}$ GeV. This mechanism of string formation, in a modulated (by the oscillating field $ϕ_{1}$) phase transition, is different from the usual Kibble mechanism.

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I. Tkachev, S. Khlebnikov, L. Kofman, A. Linde. 1998-05-05. Cosmic strings from preheating. https://doi.org/10.1016/s0370-2693(98)01094-6

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