A stringent constraint on the fractional change of proton g-factor
Fuente:
arXiv
Guardado en:
| Autores principales: | , , , , , , , |
|---|---|
| Formato: | Preprint |
| Publicado: |
2025
|
| Materias: | |
| Acceso en línea: | |
| Etiquetas: |
Agregar Etiqueta
Sin Etiquetas, Sea el primero en etiquetar este registro!
|
| _version_ | 1866915795363168256 |
|---|---|
| author | Su, Renzhi Curran, Stephen J. Darling, Jeremy Gu, Minfeng Aditya, J. N. H. S. Tang, Ningyu Li, Di Zheng, Zheng |
| author_facet | Su, Renzhi Curran, Stephen J. Darling, Jeremy Gu, Minfeng Aditya, J. N. H. S. Tang, Ningyu Li, Di Zheng, Zheng |
| contents | We report a constraint on the cosmological variation of the proton g-factor, $g_p$. By comparing the measured redshifts between \mbox{H\,{\sc i}} 21 cm and OH 18 cm lines observed with the newly commissioned Five-hundred-meter Aperture Spherical radio Telescope (FAST) toward PKS 1413+135 at $z$ = 0.24671, we obtain $Δg_{p}/g_{p} = (-4.3\pm2.5)\times10^{-5}$, which is more than two orders of magnitude more sensitive than previous constraints. In addition, we obtain sensitive constraints of $Δ(μα^{2})/(μα^{2}) = (2.0\pm1.2)\times10^{-5}$ and $Δ(μα^{2}g_{p}^{0.64})/(μα^{2}g_{p}^{0.64}) = (-4.7\pm1.9)\times10^{-6}$. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2511_17998 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | A stringent constraint on the fractional change of proton g-factor Su, Renzhi Curran, Stephen J. Darling, Jeremy Gu, Minfeng Aditya, J. N. H. S. Tang, Ningyu Li, Di Zheng, Zheng Cosmology and Nongalactic Astrophysics We report a constraint on the cosmological variation of the proton g-factor, $g_p$. By comparing the measured redshifts between \mbox{H\,{\sc i}} 21 cm and OH 18 cm lines observed with the newly commissioned Five-hundred-meter Aperture Spherical radio Telescope (FAST) toward PKS 1413+135 at $z$ = 0.24671, we obtain $Δg_{p}/g_{p} = (-4.3\pm2.5)\times10^{-5}$, which is more than two orders of magnitude more sensitive than previous constraints. In addition, we obtain sensitive constraints of $Δ(μα^{2})/(μα^{2}) = (2.0\pm1.2)\times10^{-5}$ and $Δ(μα^{2}g_{p}^{0.64})/(μα^{2}g_{p}^{0.64}) = (-4.7\pm1.9)\times10^{-6}$. |
| title | A stringent constraint on the fractional change of proton g-factor |
| topic | Cosmology and Nongalactic Astrophysics |
| url | https://arxiv.org/abs/2511.17998 |