Heterotic Cosmic Strings
Katrin Becker, Melanie Becker, Axel Krause

TL;DR
This paper demonstrates that heterotic cosmic strings originating from M5-branes in heterotic M-theory can meet all conditions for cosmological relevance, overcoming issues faced by weakly coupled heterotic strings.
Contribution
It introduces a novel class of heterotic cosmic strings from M5-branes that satisfy tension, stability, and production criteria in the strongly coupled regime.
Findings
Strings from M5-branes meet cosmological conditions.
Weakly coupled heterotic strings face unresolved problems.
M-theory regime provides a consistent framework for 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.
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