Models for Small-Scale Structure on Cosmic Strings: I. Mathematical Formalism

TL;DR

This paper introduces a mathematical formalism for modeling the evolution of small-scale structures on cosmic strings, focusing on realistic wiggly strings and their energy distribution, especially in the tensionless limit.

Contribution

It presents a new analytic model specifically designed for the evolution of small-scale wiggles on cosmic strings, extending beyond the idealized Goto-Nambu model.

Findings

Model solutions in the tensionless limit show high wiggle energy dominance.

Brief discussion of the linear limit where wiggles are a small energy fraction.

Foundation for future detailed modeling and comparison with simulations.

Abstract

We describe the formalism of a quantitative analytic model for the evolution of realistic wiggly (as opposed to Goto-Nambu) cosmic strings. The model is particularly suited for describing the evolution of small-scale structure on string networks. We discuss model solutions in the extreme limit where the wiggles make up a high fraction of the total energy of the string network (which physically corresponds to the tensionless limit) and also provide a brief discussion of the opposite (linear) limit where wiggles are a small fraction of the total energy. A companion paper will discuss the detailed modelling and scaling behavior of the small-scale wiggles in the general model, together with a basic comparison with numerical simulations.