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Unified model for vortex-string network evolution.

C J A P Martins1, J N Moore, E P S Shellard

  • 1Centro de Astrofísica da Universidade do Porto, Rua das Estrelas s/n, 4150-762 Porto, Portugal. C.J.A.P.Martins@damtp.cam.ac.uk

Physical Review Letters
|July 13, 2004
PubMed
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The velocity-dependent one-scale model accurately simulates cosmic string networks, bridging high-energy physics and condensed matter. Loop production significantly reduces vortex-string density, an effect missed by coarse-grained models.

Area of Science:

  • Cosmology
  • High-Energy Physics
  • Condensed Matter Physics

Background:

  • Cosmic strings are hypothetical topological defects.
  • Understanding their evolution is crucial for cosmology and condensed matter physics.
  • Existing models often lack detailed velocity dependence or loop production.

Purpose of the Study:

  • To introduce and test the velocity-dependent one-scale string evolution model.
  • To compare its predictions with numerical simulations of string networks.
  • To explore connections between high-energy and condensed matter physics.

Main Methods:

  • Developed an analytic model incorporating velocity dependence.
  • Performed numerical tests of the model.
  • Compared model results with simulations of Goto-Nambu and field theory strings.

Related Experiment Videos

  • Analyzed the impact of loop production on string density.

    • Main Results:

    • The model accurately reproduces large-scale behavior and scaling laws of simulations.
    • Established a clear link between high-energy and condensed matter physics limits.
    • Reproduced experimental results in condensed matter contexts.
    • Showed loop production significantly reduces vortex-string density.

    Conclusions:

    • The velocity-dependent one-scale model is a robust tool for studying cosmic string networks.
    • The model successfully bridges different physics domains.
    • Loop production is a critical factor for accurate string density predictions.