Heterotic Cosmic Strings

Abstract

We show that all three conditions for the cosmological relevance of heterotic cosmic strings, the right tension, stability and a production mechanism at the end of inflation, can be met in the strongly coupled M-theory regime. Whereas cosmic strings generated from weakly coupled heterotic strings have the well known problems posed by Witten in 1985, we show that strings arising from M5-branes wrapped around 4-cycles (divisors) of a Calabi-Yau in heterotic M-theory compactifications, solve these problems in an elegant fashion.

25 pages, v2: section and references added

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• Cosmic Necklaces from String Theory
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• Large Gravitational Waves and Lyth Bound in Multi Brane Inflation
• S-Track Stabilization of Heterotic de Sitter Vacua
• String Necklaces and Primordial Black Holes from Type IIB Strings
• Interactions of Cosmic Superstrings
• Gravitational Wave Bursts from Cosmic Superstring Reconnections
• Highly Excited Strings I: Generating Function
• Instantons, Assisted Inflation and Heterotic M-theory
• Cosmic Superstring Scattering in Backgrounds
• A Tutorial on Links between Cosmic String Theory and Superstring Theory
• Covariant Vertex Operators for Cosmic Strings
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• Half-BPS cosmic string in N=2 supergravity in the presence of a dilaton
• Holographic Cosmology from a System of M2-M5 Branes
• PhD Thesis: String theory in the early universe