| Автор | Alessandro Cerioni |
| Автор | Robert H. Brandenberger |
| Дата выпуска | 2011-08-01 |
| dc.description | We consider linear perturbations about a homogeneous and isotropic cosmological background in the projectable version of Hořava-Lifshitz gravity. Starting from the action for cosmological perturbations, we identify the canonically normalized fluctuation variables. We find that - in contrast to what happens in the non-projectable version of the theory - the extra scalar cosmological perturbation mode is already dynamical at the level of linear perturbations and is either ghost-like or tachyonic depending on the value of a free parameter. This indicates a problem for the projectable version of Hořava-Lifshitz gravity. |
| Формат | application.pdf |
| Издатель | Institute of Physics Publishing |
| Название | Cosmological perturbations in the projectable version of Hořava-Lifshitz gravity |
| Тип | paper |
| DOI | 10.1088/1475-7516/2011/08/015 |
| Electronic ISSN | 1475-7516 |
| Журнал | Journal of Cosmology and Astroparticle Physics |
| Том | 2011 |
| Первая страница | 15 |
| Последняя страница | 015 |
| Выпуск | 08 |
