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Scaling solution for small cosmic string loops.

Jorge V Rocha1

  • 1Department of Physics, University of California, Santa Barbara, California 93106, USA. jrocha@physics.ucsb.edu

Physical Review Letters
|March 21, 2008
PubMed
Summary
This summary is machine-generated.

Cosmic string loops shrink due to gravitational radiation, leading to a stable scaling regime. This research models cosmic string evolution, showing finite energy density in loops over time.

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Area of Science:

  • Cosmology
  • Theoretical Physics
  • Astrophysics

Background:

  • Cosmic strings are hypothetical topological defects formed during phase transitions in the early universe.
  • The evolution of cosmic string networks is crucial for understanding structure formation and the universe's large-scale properties.

Purpose of the Study:

  • To solve the time evolution equation for the number density of cosmic string loops.
  • To incorporate the effect of gravitational radiation on loop decay.
  • To analyze the resulting scaling regime and its properties.

Main Methods:

  • Solving the detailed balance equation for loop number density.
  • Including energy loss due to gravitational radiation.
  • Analyzing the asymptotic behavior of the solution.

Main Results:

  • The inclusion of gravitational radiation causes cosmic string loops to shrink and decay.
  • The network approaches a scaling regime where the total energy density in loops remains finite.
  • The solution exhibits convergence in both infrared and ultraviolet limits.

Conclusions:

  • Gravitational radiation is a key factor in cosmic string network evolution.
  • A stable scaling regime is achieved, implying a finite contribution of cosmic strings to the universe's energy density.
  • The model provides insights into the long-term behavior and observational signatures of cosmic strings.