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Collisions of strings with Y junctions.

E J Copeland1, T W B Kibble, D A Steer

  • 1School of Physics and Astronomy, University of Nottingham, University Park, Nottingham NG7 2RD, United Kingdom. ed.copeland@nottingham.ac.uk

Physical Review Letters
|August 16, 2006
PubMed
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We explored Nambu-Goto string dynamics with junctions. Intercommuting strings face velocity constraints, impacting cosmic and non-Abelian string network evolution.

Area of Science:

  • Theoretical physics
  • String theory
  • Cosmic strings

Background:

  • Nambu-Goto strings are fundamental objects in string theory.
  • String junctions, where three strings meet, are crucial for network dynamics.
  • Intercommuting strings, which exchange partners, are key phenomena.

Purpose of the Study:

  • To investigate the dynamics of Nambu-Goto strings with three-string junctions.
  • To analyze the process of string intercommuting and its associated constraints.
  • To explore the implications for cosmic and non-Abelian string networks.

Main Methods:

  • Developed an exact solution for string dynamics at junctions.
  • Examined the kinematics of intercommuting straight strings.
  • Identified velocity-dependent constraints on the intercommuting process.

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Main Results:

  • Presented a novel exact solution for string dynamics at junctions.
  • Demonstrated that intercommuting is kinematically constrained by relative velocity.
  • Found that high relative velocities inhibit string exchange.

Conclusions:

  • String intercommuting is not always possible due to kinematic constraints.
  • These findings have significant implications for understanding the evolution of cosmic superstring networks.
  • The results also inform the behavior of non-Abelian string networks.