On the Gravitational Origin of the QCD Axion
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arXiv
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| Autori principali: | , , |
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| Natura: | Preprint |
| Pubblicazione: |
2025
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| _version_ | 1866912428817645568 |
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| author | Karananas, Georgios K. Shaposhnikov, Mikhail Zell, Sebastian |
| author_facet | Karananas, Georgios K. Shaposhnikov, Mikhail Zell, Sebastian |
| contents | Gravity can give rise to (pseudo)scalar fields, for instance due to torsion. In particular, axions of gravitational origin have been proposed as a minimal and compelling solution to the strong CP problem. In this work, we critically examine the feasibility of this approach. We demonstrate that models in which the scalar field couples to fermionic currents only through derivatives do not yield a satisfactory axion. Moreover, we identify the necessary conditions for generating a gravitational axion through quantum effects, highlighting Weyl-invariant Einstein-Cartan gravity as a promising theoretical setting. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2506_11836 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | On the Gravitational Origin of the QCD Axion Karananas, Georgios K. Shaposhnikov, Mikhail Zell, Sebastian High Energy Physics - Theory General Relativity and Quantum Cosmology High Energy Physics - Phenomenology Gravity can give rise to (pseudo)scalar fields, for instance due to torsion. In particular, axions of gravitational origin have been proposed as a minimal and compelling solution to the strong CP problem. In this work, we critically examine the feasibility of this approach. We demonstrate that models in which the scalar field couples to fermionic currents only through derivatives do not yield a satisfactory axion. Moreover, we identify the necessary conditions for generating a gravitational axion through quantum effects, highlighting Weyl-invariant Einstein-Cartan gravity as a promising theoretical setting. |
| title | On the Gravitational Origin of the QCD Axion |
| topic | High Energy Physics - Theory General Relativity and Quantum Cosmology High Energy Physics - Phenomenology |
| url | https://arxiv.org/abs/2506.11836 |