Collapse of Axion Domain Wall Induced by Helical Primordial Magnetic Fields
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arXiv
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| Main Authors: | , , , |
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| Format: | Preprint |
| Published: |
2025
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| _version_ | 1866909931334008832 |
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| author | Zhao, Zizhuo Di, Yuefeng Bian, Ligong Shu, Jing |
| author_facet | Zhao, Zizhuo Di, Yuefeng Bian, Ligong Shu, Jing |
| contents | Stable domain wall (DW) must decay to avoid overclose the Universe. A commonly used solution is to slightly break the PQ symmetry by introducing a bias term in the potential. In this work, we propose an alternative, symmetry-preserving mechanism: coupling the axion field to a helical primordial magnetic field (PMF) via the Chern-Simons term. Using three-dimensional lattice simulations, we evolve the DW network and demonstrate that it can successfully drive DW decay. Our quantitative results further show that the correlation length of the PMF plays a crucial role in determining the decay rate of the DW network and the resulting axion and gravitational wave radiation. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2511_22949 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Collapse of Axion Domain Wall Induced by Helical Primordial Magnetic Fields Zhao, Zizhuo Di, Yuefeng Bian, Ligong Shu, Jing Cosmology and Nongalactic Astrophysics High Energy Physics - Lattice High Energy Physics - Phenomenology High Energy Physics - Theory Stable domain wall (DW) must decay to avoid overclose the Universe. A commonly used solution is to slightly break the PQ symmetry by introducing a bias term in the potential. In this work, we propose an alternative, symmetry-preserving mechanism: coupling the axion field to a helical primordial magnetic field (PMF) via the Chern-Simons term. Using three-dimensional lattice simulations, we evolve the DW network and demonstrate that it can successfully drive DW decay. Our quantitative results further show that the correlation length of the PMF plays a crucial role in determining the decay rate of the DW network and the resulting axion and gravitational wave radiation. |
| title | Collapse of Axion Domain Wall Induced by Helical Primordial Magnetic Fields |
| topic | Cosmology and Nongalactic Astrophysics High Energy Physics - Lattice High Energy Physics - Phenomenology High Energy Physics - Theory |
| url | https://arxiv.org/abs/2511.22949 |