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arXiv · 2607.22481

Nambu-Goldstone emissions from the cosmological evolution of global monopoles

Yukihiro Kanda·Naoya Kitajima
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Abstract

We show the emission of the Nambu-Goldstone (NG) bosons from the cosmological evolution of global monopoles. The NG bosons are non-thermally produced from the dynamics of global monopoles such as the pair annihilation of monopole and anti-monopole. Our numerical lattice simulations demonstrate that the spectrum of NG bosons emitted from the scaling evolution of global monopoles has a peak around the horizon scale, as in the case with the global string and the semilocal string. We also estimate the abundance of the pseudo-Nambu-Goldstone (pNG) dark matter when one (or both) of the NG modes has a soft mass.

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Yukihiro Kanda, Naoya Kitajima. 2026-07-24. Nambu-Goldstone emissions from the cosmological evolution of global monopoles. https://arxiv.org/abs/2607.22481

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