Astrophysical Consequences of an Electroweak $η_{\rm w}$ Pseudo-Scalar
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arXiv
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| Format: | Preprint |
| Publié: |
2025
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| _version_ | 1866914089376153600 |
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| author | Davoudiasl, Hooman |
| author_facet | Davoudiasl, Hooman |
| contents | Recently, it has been suggested that the spectrum of physical states in the Standard Model may include an ultralight pseudo-scalar, denoted by $η_{\rm w}$, in analogy with the $η'$ state arising from the strong interactions. We find that typical expectations for the properties of $η_{\rm w}$ get challenged by astrophysical constraints on the couplings of ultralight bosons. Our strongest limit sets a lower bound of $\mathcal{O}({\rm 100~TeV})$ on the decay constant of the hypothesized pseudo-scalar. We also briefly discuss whether $η_{\rm w}$ could be a dark matter candidate, or the origin of dark energy, but conclude that those identifications appear unlikely. Given the important implications of a potentially overlooked $η_{\rm w}$ state for a more complete understanding of the electroweak interactions and a fundamental description of Nature, further theoretical and phenomenological investigations of this possibility and its associated physics are warranted. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2510_02310 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Astrophysical Consequences of an Electroweak $η_{\rm w}$ Pseudo-Scalar Davoudiasl, Hooman High Energy Physics - Phenomenology Astrophysics of Galaxies Recently, it has been suggested that the spectrum of physical states in the Standard Model may include an ultralight pseudo-scalar, denoted by $η_{\rm w}$, in analogy with the $η'$ state arising from the strong interactions. We find that typical expectations for the properties of $η_{\rm w}$ get challenged by astrophysical constraints on the couplings of ultralight bosons. Our strongest limit sets a lower bound of $\mathcal{O}({\rm 100~TeV})$ on the decay constant of the hypothesized pseudo-scalar. We also briefly discuss whether $η_{\rm w}$ could be a dark matter candidate, or the origin of dark energy, but conclude that those identifications appear unlikely. Given the important implications of a potentially overlooked $η_{\rm w}$ state for a more complete understanding of the electroweak interactions and a fundamental description of Nature, further theoretical and phenomenological investigations of this possibility and its associated physics are warranted. |
| title | Astrophysical Consequences of an Electroweak $η_{\rm w}$ Pseudo-Scalar |
| topic | High Energy Physics - Phenomenology Astrophysics of Galaxies |
| url | https://arxiv.org/abs/2510.02310 |