تقرير
Anisotropic Mimetic Cosmology
| العنوان: | Anisotropic Mimetic Cosmology |
|---|---|
| المؤلفون: | Abbassi, M. H., Jozani, A., Sepangi, H. R. |
| المصدر: | Phys. Rev. D 97, 123510 (2018) |
| سنة النشر: | 2018 |
| المجموعة: | General Relativity and Quantum Cosmology High Energy Physics - Theory |
| مصطلحات موضوعية: | General Relativity and Quantum Cosmology, High Energy Physics - Theory |
| الوصف: | We consider a mimetic set up in which the mimetic scalar is coupled to a vector field. It is shown that such a field with a time-like component does not contribute to the background equations and yet produces healthy isocurvature perturbations with respect to ghost and gradient instabilities in spite of the absence of any propagating curvature perturbations at the level of the quadratic action. We then consider a vector field with space-like components which leads to an anisotropic Bianchi universe and show that the ghost and gradient instabilities are absent in the limit of high momenta and that the propagating curvature perturbations have healthy UV behavior. Comment: 12 pages, 4 figures, to appear in PRD |
| نوع الوثيقة: | Working Paper |
| DOI: | 10.1103/PhysRevD.97.123510 |
| URL الوصول: | http://arxiv.org/abs/1803.00209 |
| رقم الأكسشن: | edsarx.1803.00209 |
| قاعدة البيانات: | arXiv |
| DOI: | 10.1103/PhysRevD.97.123510 |
|---|