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Cosmic (Super)String Constraints from 21 cm Radiation.

Rishi Khatri1, Benjamin D Wandelt

  • 1Department of Astronomy, University of Illinois at Urbana-Champaign, 1002 W. Green Street, Urbana, IL 61801, USA. rkhatri2@uiuc.edu

Physical Review Letters
|March 21, 2008
PubMed
Summary
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Future experiments can detect cosmic strings and cosmic superstrings by analyzing the cosmic 21 cm power spectrum. This will help constrain string tension and probe brane inflation models.

Area of Science:

  • Cosmology and Astrophysics
  • Early Universe Physics
  • String Theory

Background:

  • Cosmic strings are hypothetical topological defects formed during phase transitions in the early Universe.
  • Cosmic superstrings arise from brane inflation, an alternative cosmological model.
  • The cosmic 21 cm power spectrum is a key observable for studying the early Universe.

Purpose of the Study:

  • To calculate the contribution of cosmic strings and cosmic superstrings to the cosmic 21 cm power spectrum at high redshifts (z >= 30).
  • To assess the potential of future experiments to constrain cosmic string properties and probe brane inflation models.

Main Methods:

  • Theoretical calculations of the cosmic 21 cm power spectrum, incorporating contributions from cosmic strings and superstrings.

Related Experiment Videos

  • Analysis of observational constraints based on the collecting area and sky coverage of current and future experiments.

    • Main Results:

    • Cosmic strings and superstrings leave a detectable imprint on the cosmic 21 cm power spectrum.
    • Current experiments (approx. 1 km2 collecting area) are insufficient for meaningful constraints.
    • Future experiments with 10^4-10^6 km2 collecting area can constrain cosmic string tensions G mu >= 10^-10 - 10^-12 (mass scale > 10^13 GeV).

    Conclusions:

    • Future large-scale experiments offer a unique opportunity to detect cosmic strings/superstrings and test early Universe models.
    • This research provides a pathway to constrain fundamental physics parameters, including string tension and brane inflation model space.