تقرير
Spatial variations of the fine-structure constant in symmetron models
| العنوان: | Spatial variations of the fine-structure constant in symmetron models |
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| المؤلفون: | Silva, Marvin F., Winther, Hans A., Mota, David F., Martins, C. J. A. P. |
| المصدر: | Phys. Rev. D 89, 024025 (2014) |
| سنة النشر: | 2013 |
| المجموعة: | Astrophysics |
| مصطلحات موضوعية: | Astrophysics - Cosmology and Extragalactic Astrophysics |
| الوصف: | We investigate the variation of the fine-structure constant, {\alpha}, in symmetron models using N-body simulations in which the full spatial distribution of {\alpha} at different redshifts has been calculated. In particular, we obtain simulated sky maps for this variation, and determine its power spectrum. We find that in high-density regions of space (such as deep inside dark matter halos) the value of {\alpha} approaches the value measured on Earth. In the low-density outskirts of halos the scalar field value can approach the symmetry breaking value and leads to significantly different values of {\alpha}. If the scalar-photon coupling strength {\beta}{\gamma} is of order unity we find that the variation of {\alpha} inside dark matter halos can be of the same magnitude as the recent claims by Webb et al. of a dipole variation. Importantly, our results also show that with low-redshift symmetry breaking these models exhibit some dependence of {\alpha} on lookback time (as opposed to a pure spatial dipole) which could in principle be detected by sufficiently accurate spectroscopic measurements, such as those of ALMA and the ELT-HIRES. Comment: 11 pages, 9 figures |
| نوع الوثيقة: | Working Paper |
| DOI: | 10.1103/PhysRevD.89.024025 |
| URL الوصول: | http://arxiv.org/abs/1310.2152 |
| رقم الأكسشن: | edsarx.1310.2152 |
| قاعدة البيانات: | arXiv |
| DOI: | 10.1103/PhysRevD.89.024025 |
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