Implications of cosmic strings with time-varying tension on CMB and large scale structure

Abstract

We investigate cosmological evolution and implications of cosmic strings with time-dependent tension. We derive basic equations of time development of the correlation length and the velocity of such strings, based on the one scale model. Then, we find that, in the case where the tension depends on some power of the cosmic time, cosmic strings with time-dependent tension goes into the scaling solution if the power is lower than a critical value. We also discuss cosmic microwave background anisotropy and matter power spectra produced by these strings. The constraints on their tensions from the Wilkinson microwave anisotropy probe (WMAP) three year data and Sloan digital sky survey (SDSS) data are also given.

arXiv comment17 pages, 7 figures

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• Cosmic String in the BTZ Black Hole Background with Time-Dependant Tension
• The evolution of circular loops of a cosmic string with periodic tension
• Cosmic (super)strings with a time-varying tension
• The circular loop equation of a cosmic string with time-varying tension
• The circular loop equation of a cosmic string with time-varying tension in de Sitter spacetimes
• Non-Scaling Topological Defects and Gravitational Waves in Higgs Portal
• Adiabatic fluctuations from cosmic strings in a contracting universe