Suppression of scalar perturbations due to a heavy axion
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arXiv
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| Hauptverfasser: | , , , |
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| Format: | Preprint |
| Veröffentlicht: |
2025
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| _version_ | 1866911389994450944 |
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| author | Zhang, Kai-Ge He, Jian-Feng Fu, Chengjie Guo, Zong-Kuan |
| author_facet | Zhang, Kai-Ge He, Jian-Feng Fu, Chengjie Guo, Zong-Kuan |
| contents | A fast-rolling axion can transfer its kinetic energy to gauge fields via the Chern-Simons coupling, leading to copious production of gauge quanta during inflation. The amplified gauge fields act as a source for both scalar and tensor perturbations. In this work, we propose a mechanism for suppressing scalar perturbations while sourcing strong tensor perturbations. We present an implementation of such a mechanism, demonstrating that sourced tensor perturbations are expected to be detected by upcoming next-generation CMB experiments. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2510_02828 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Suppression of scalar perturbations due to a heavy axion Zhang, Kai-Ge He, Jian-Feng Fu, Chengjie Guo, Zong-Kuan High Energy Physics - Phenomenology Cosmology and Nongalactic Astrophysics General Relativity and Quantum Cosmology A fast-rolling axion can transfer its kinetic energy to gauge fields via the Chern-Simons coupling, leading to copious production of gauge quanta during inflation. The amplified gauge fields act as a source for both scalar and tensor perturbations. In this work, we propose a mechanism for suppressing scalar perturbations while sourcing strong tensor perturbations. We present an implementation of such a mechanism, demonstrating that sourced tensor perturbations are expected to be detected by upcoming next-generation CMB experiments. |
| title | Suppression of scalar perturbations due to a heavy axion |
| topic | High Energy Physics - Phenomenology Cosmology and Nongalactic Astrophysics General Relativity and Quantum Cosmology |
| url | https://arxiv.org/abs/2510.02828 |