Scaling solutions of wiggly cosmic strings

Almeida, A. R. R.; Martins, C. J. A. P.

doi:10.48550/arxiv.2107.11653

Cited by 1 publication

(1 citation statement)

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“…In order to obtain more realistic predictions, it is therefore necessary to go beyond this minimal description and consider, e.g., extensions of the simplest Nambu-Goto model featuring additional worldsheet degrees of freedom. Such degrees of freedom can be currents induced by charge carriers that propagate along cosmic strings [46,47], or, e.g., short-wavelength propagation modes known as wiggles [48]. In this paper, we will focus on the former possibility and consider neutral currents, i.e., currents of particles that are only charged under the Abelian gauge group whose spontaneous breaking results in the formation of the string network but that do not interact with any other gauge force.…”

Section: Introductionmentioning

confidence: 99%

Gravitational Waves from Current-Carrying Cosmic Strings

Auclair,

Blasi,

Brdar

et al. 2022

Preprint

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Cosmic strings are predicted by many Standard Model extensions involving the cosmological breaking of a symmetry with nontrivial first homotopy group and represent a potential source of primordial gravitational waves (GWs). Present efforts to model the GW signal from cosmic strings are often based on minimal models, such as, e.g., the Nambu-Goto action that describes cosmic strings as exactly one-dimensional objects without any internal structure. In order to arrive at more realistic predictions, it is therefore necessary to consider nonminimal models that make an attempt at accounting for the microscopic properties of cosmic strings. With this goal in mind, we derive in this paper the GW spectrum emitted by current-carrying cosmic strings (CCCSs), which may form in a variety of cosmological scenarios. Our analysis is based on a generalized version of the velocity-dependent one-scale (VOS) model, which, in addition to the mean velocity and correlation length of the string network, also describes the evolution of a chiral (light-like) current. As we are able to show, the solutions of the VOS equations imply a temporarily growing fractional cosmicstring energy density, Ωcs. This results in an enhanced GW signal across a broad frequency interval, whose boundaries are determined by the times of generation and decay of cosmic-string currents. Our findings have important implications for GW experiments in the Hz to MHz band and motivate the construction of realistic particle physics models that give rise to large currents on cosmic strings.

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Section: Introductionmentioning

confidence: 99%