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Setting Limits on Supersymmetry Using Simplified Models
07:46

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Published on: November 15, 2013

Stable charged cosmic strings.

H Weigel1, M Quandt, N Graham

  • 1Physics Department, Stellenbosch University, Matieland 7602, South Africa.

Physical Review Letters
|April 8, 2011
PubMed
Summary
This summary is machine-generated.

This study demonstrates that cosmic strings can be stabilized by heavy fermion doublets within a modified standard model. Stable charged strings form without requiring extreme fermion masses or couplings, suggesting realistic conditions for cosmic string binding.

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Last Updated: Jun 3, 2026

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Area of Science:

  • Theoretical Physics
  • Cosmology
  • Particle Physics

Background:

  • Cosmic strings are hypothetical topological defects in spacetime.
  • Their stability is crucial for cosmological models.
  • Previous models often required extreme conditions for string stabilization.

Purpose of the Study:

  • To investigate the quantum stabilization of cosmic strings.
  • To explore stabilization mechanisms using heavy fermion doublets in a reduced standard model.
  • To determine realistic conditions for cosmic string binding.

Main Methods:

  • Theoretical analysis of quantum stabilization.
  • Numerical simulations of string profiles.
  • Modeling interactions within a reduced standard model framework.

Main Results:

  • Charged cosmic strings become stable when electroweak bosons couple to fermions less than twice the mass of the top quark.
  • This stabilization occurs without requiring extraordinarily large fermion masses or unrealistic couplings.
  • The most favorable string profile is a Higgs vacuum expectation value trough with a radius of approximately 10⁻¹⁸ m.

Conclusions:

  • Cosmic string stabilization is achievable under more realistic conditions than previously thought.
  • The proposed mechanism offers a viable pathway for cosmic strings within the standard model.
  • The model ensures vacuum stability as neutral strings are not energetically favored.