Overproduction of cosmic superstrings

Abstract

We show that the naive application of the Kibble mechanism seriously underestimates the initial density of cosmic superstrings that can be formed during the annihilation of D-branes in the early universe, as in models of brane-antibrane inflation. We study the formation of defects in effective field theories of the string theory tachyon both analytically, by solving the equation of motion of the tachyon field near the core of the defect, and numerically, by evolving the tachyon field on a lattice. We find that defects generically form with correlation lengths of order M_s^{-1} rather than H^{-1}. Hence, defects localized in extra dimensions may be formed at the end of inflation. This implies that brane-antibrane inflation models where inflation is driven by branes which wrap the compact manifold may have problems with overclosure by cosmological relics, such as domain walls and monopoles.

31 pages, 16 figures, JHEP style; References added; Improved discussion of initial conditions

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• Warped Reheating in Multi-Throat Brane Inflation
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• Scaling Properties of Domain Wall Networks
• Multibrane Inflation and Dynamical Flattening of the Inflaton Potential
• K-Oscillons: Oscillons with Non-Canonical Kinetic Terms
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• Introduction to Cosmic F- and D-Strings
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• Preheating After Modular Inflation
• Brane necklaces and brane coils
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• Constraints on Brane Inflation and Cosmic Strings
• Primordial black holes from cosmic necklaces
• String Vertex Operators and Cosmic Strings
• Cosmological constraints on string scale and coupling arising from tachyonic instability
• Dark matter production from cosmic necklaces
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• Brane Inflation, Solitons and Cosmological Solutions: I
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• Global and Local D-vortices
• Cosmic D-Strings and Vortons in Supergravity
• Cosmic strings in a space-time with positive cosmological constant
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• A Tutorial on Links between Cosmic String Theory and Superstring Theory
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• Cosmic Strings Collision in Cosmological Backgrounds
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• Non-Relativistic Strings in Expanding Spacetime
• Tachyon cosmology with non-vanishing minimum potential: a unified model
• Cosmological Perturbations in Inflationary Models with Anisotropic Space-Time Scaling in Lifshitz Background
• Exact solutions in the Dirac-Born-Infeld effective theory and the fate of tachyon
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