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Setting Limits on Supersymmetry Using Simplified Models
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Higher order intercommutations in cosmic string collisions.

A Achúcarro1, G J Verbiest

  • 1Instituut-Lorentz for Theoretical Physics, Leiden, The Netherlands. Achucar@lorentz.leidenuniv.nl

Physical Review Letters
|September 28, 2010
PubMed
Summary
This summary is machine-generated.

Scientists observed multiple cosmic string reconnections and kink train formation at high speeds. This reveals new insights into the behavior of Abelian Higgs cosmic strings in the type-II regime.

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Area of Science:

  • Cosmology
  • Particle Physics
  • String Theory

Background:

  • Cosmic strings are hypothetical topological defects.
  • Their interactions, particularly reconnections, are crucial for understanding early universe physics.
  • The Abelian Higgs model provides a framework for studying cosmic string behavior.

Purpose of the Study:

  • To investigate multiple intercommutation events of Abelian Higgs cosmic strings.
  • To characterize the formation of kink trains during high-speed collisions.
  • To explore the dependence of these phenomena on the parameter β.

Main Methods:

  • Numerical simulations of cosmic string collisions.
  • Analysis of string interactions in the deep type-II regime (16 ≤ β ≤ 64).
  • Tracking of reconnection events and kink dynamics.

Main Results:

  • First observation of multiple (triple and quadruple) intercommutations.
  • Formation of kink trains with up to four kinks.
  • Reduced critical speed for double reconnection with increasing β (from ~0.98c to ~0.86c).
  • β-dependent mechanisms for second intercommutation (loop vs. radiation blob).

Conclusions:

  • Multiple reconnections and kink trains are generic in the deep type-II regime.
  • String core interactions and gravitational wave emission are affected by these events.
  • Findings provide crucial data for cosmic string models and cosmological implications.