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D-term inflation without cosmic strings.

J Urrestilla1, A Achúcarro, A C Davis

  • 1Department of Physics and Astronomy, University of Sussex, Brighton BN1 9QJ, United Kingdom.

Physical Review Letters
|July 13, 2004
PubMed
Summary
This summary is machine-generated.

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This study introduces a novel D-term inflation model inspired by superstring theory, avoiding cosmic string formation and aligning with cosmic microwave background data. The modified model utilizes additional superfields to create stable, non-topological strings.

Area of Science:

  • Cosmology
  • String Theory
  • Particle Physics

Background:

  • D-term inflation is a theoretical framework for cosmic inflation.
  • Cosmic strings are hypothetical topological defects that may form during phase transitions in the early universe.
  • Current cosmic microwave background (CMB) observations constrain inflationary models.

Purpose of the Study:

  • To present a superstring-inspired D-term inflation model that avoids cosmic string formation.
  • To ensure the model satisfies current CMB observational constraints.
  • To investigate the properties of the resulting non-topological, Bogomol'nyi-Prasad-Sommerfield strings.

Main Methods:

  • Modification of the minimal D-term inflation model by introducing a second pair of charged superfields.

Related Experiment Videos

  • Analysis of the model's implications for cosmic string formation.
  • Assessment of compatibility with CMB constraints.

    • Main Results:

    • The proposed model successfully prevents the formation of cosmic strings.
    • The scenario is consistent with current CMB observational constraints.
    • The introduced superfields lead to non-topological (semilocal) and Bogomol'nyi-Prasad-Sommerfield strings.
    • These strings are expected to be stable against supergravity corrections.

    Conclusions:

    • A superstring-inspired D-term inflation model that avoids cosmic string formation and satisfies CMB constraints has been developed.
    • The inclusion of a second pair of charged superfields naturally leads to semilocal strings, resolving a potential issue with cosmic string formation in D-term inflation.
    • This scenario offers a viable alternative for inflationary cosmology within the context of string theory.