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arXiv · 2610.08254

Gravitational Waves and Nambu-Goldstone Bosons from Infrared-Finite Cosmic Strings

Hajime Fukuda·Shuailiang Ge·Keisuke Harigaya
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Abstract

Skyrmion lines and semi-local strings are examples of infrared-finite cosmic strings that arise in theories with spontaneously broken global symmetries. Unlike global $U(1)$ strings, they do not support the long-range Nambu-Goldstone boson (NGB) profile responsible for a logarithmically infrared-divergent string tension. We argue that NGB emission from their low-frequency oscillations is strongly suppressed. Consequently, their gravitational-wave signals may be comparable to those from local strings.

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Hajime Fukuda, Shuailiang Ge, Keisuke Harigaya. 2026-10-06. Gravitational Waves and Nambu-Goldstone Bosons from Infrared-Finite Cosmic Strings. https://arxiv.org/abs/2610.08254

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