تقرير
Comparing metric and Palatini approaches to vector Horndeski theory
| العنوان: | Comparing metric and Palatini approaches to vector Horndeski theory |
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| المؤلفون: | Davydov, E. A. |
| سنة النشر: | 2017 |
| المجموعة: | Mathematics General Relativity and Quantum Cosmology High Energy Physics - Theory Mathematical Physics |
| مصطلحات موضوعية: | High Energy Physics - Theory, General Relativity and Quantum Cosmology, Mathematical Physics, 83D, J.2 |
| الوصف: | We compare cosmologic and spherically symmetric solutions to metric and Palatini versions of vector Horndeski theory. It appears that Palatini formulation of the theory admits more degrees of freedom. Specifically, homogeneous isotropic configuration is effectively bimetric, and static spherically symmetric configuration contains non-metric connection. In general, the exact solution in metric case coincides with the approximative solution in Palatini case. The Palatini version of the theory appears to be more complicated, but the resulting non-linearity may be useful: we demonstrate that it allows the specific cosmological solution to pass through singularity, which is not possible in metric approach. Comment: 14 pages, to be published in Int.J.Mod.Phys.D version 2 - minor changes: page format changed for a better view |
| نوع الوثيقة: | Working Paper |
| DOI: | 10.1142/S0218271818500384 |
| URL الوصول: | http://arxiv.org/abs/1708.09796 |
| رقم الأكسشن: | edsarx.1708.09796 |
| قاعدة البيانات: | arXiv |
| DOI: | 10.1142/S0218271818500384 |
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