Revisiting Metastable Cosmic String Breaking
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arXiv
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| Autori principali: | , , , , |
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| Natura: | Preprint |
| Pubblicazione: |
2023
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| _version_ | 1866910430841012224 |
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| author | Chitose, Akifumi Ibe, Masahiro Nakayama, Yuhei Shirai, Satoshi Watanabe, Keiichi |
| author_facet | Chitose, Akifumi Ibe, Masahiro Nakayama, Yuhei Shirai, Satoshi Watanabe, Keiichi |
| contents | Metastable cosmic strings appear in models of new physics with a two-step symmetry breaking $G\to H\to 1$, where $π_1(H)\neq 0$ and $π_1(G)=0$. They decay via the monopole-antimonopole pair creation inside. Conventionally, the breaking rate has been estimated by an infinitely thin string approximation, which requires a large hierarchy between the symmetry breaking scales. In this paper, we reexamine it by taking into account the finite sizes of both the cosmic string and the monopole. We obtain a robust lower limit on the tunneling factor $e^{-S_B}$ even for regimes the conventional estimate is unreliable. In particular, it is relevant to the cosmic string interpretation of the gravitational wave signals recently reported by pulsar timing array experiments. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2312_15662 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Revisiting Metastable Cosmic String Breaking Chitose, Akifumi Ibe, Masahiro Nakayama, Yuhei Shirai, Satoshi Watanabe, Keiichi High Energy Physics - Phenomenology Cosmology and Nongalactic Astrophysics High Energy Physics - Theory Metastable cosmic strings appear in models of new physics with a two-step symmetry breaking $G\to H\to 1$, where $π_1(H)\neq 0$ and $π_1(G)=0$. They decay via the monopole-antimonopole pair creation inside. Conventionally, the breaking rate has been estimated by an infinitely thin string approximation, which requires a large hierarchy between the symmetry breaking scales. In this paper, we reexamine it by taking into account the finite sizes of both the cosmic string and the monopole. We obtain a robust lower limit on the tunneling factor $e^{-S_B}$ even for regimes the conventional estimate is unreliable. In particular, it is relevant to the cosmic string interpretation of the gravitational wave signals recently reported by pulsar timing array experiments. |
| title | Revisiting Metastable Cosmic String Breaking |
| topic | High Energy Physics - Phenomenology Cosmology and Nongalactic Astrophysics High Energy Physics - Theory |
| url | https://arxiv.org/abs/2312.15662 |