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Related Experiment Videos

Topological defects in contracting universes.

P P Avelino1, C J A P Martins, C Santos

  • 1Centro de Fisica do Porto e Departamento de Fisica da Faculdade de Ciencias, Universidade do Porto, Rua do Campo Alegre 687, 4169-007 Porto, Portugal. ppavelin@fc.up.pt

Physical Review Letters
|January 7, 2003
PubMed
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Cosmic string networks in contracting universes act like radiation fluids. This behavior impacts cosmic dynamics, generating radiation and inhomogeneity, with implications for bouncing and cyclic universe models.

Area of Science:

  • Cosmology
  • Theoretical Physics
  • Astrophysics

Background:

  • Cosmic strings are hypothetical topological defects formed during phase transitions in the early universe.
  • Understanding their behavior in different cosmic epochs is crucial for cosmological models.
  • Contracting universe phases present unique dynamics not fully explored for string networks.

Purpose of the Study:

  • To investigate the behavior of cosmic string networks during a contracting phase of the universe.
  • To analyze the consequences of these networks on cosmic evolution and dynamics.
  • To explore the potential role of cosmic strings in bouncing and cyclic universe scenarios.

Main Methods:

  • Deriving scaling solutions to approximate string network behavior as radiation fluids.

Related Experiment Videos

  • Conducting high-resolution numerical simulations to test the derived scaling solutions.
  • Analyzing the generation of gravitational radiation by string networks.

    • Main Results:

    • Cosmic string networks effectively behave as radiation fluids during universe contraction.
    • String networks and their generated gravitational radiation influence local and global cosmic dynamics.
    • These networks act as significant sources of radiation, entropy, and inhomogeneity.

    Conclusions:

    • Cosmic string networks play a significant role in the evolution of contracting universes.
    • The findings support the potential relevance of cosmic strings in bouncing and cyclic cosmological models.
    • Further research into string network dynamics can refine our understanding of universe evolution.