The Cosmology of a Universe with Spontaneously-Broken Lorentz Symmetry
A self consistent effective field theory of modified gravity has recently been proposed with spontaneous breaking of local Lorentz invariance. The symmetry is broken by a vector field with the wrong-sign mass term and it has been shown to have additional graviton modes and modified dispersion relati...
| Egile Nagusiak: | , , , |
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| Formatua: | Journal article |
| Argitaratua: |
2006
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| _version_ | 1826257650452529152 |
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| author | Ferreira, P Gripaios, B Saffari, R Zlosnik, T |
| author_facet | Ferreira, P Gripaios, B Saffari, R Zlosnik, T |
| author_sort | Ferreira, P |
| collection | OXFORD |
| description | A self consistent effective field theory of modified gravity has recently been proposed with spontaneous breaking of local Lorentz invariance. The symmetry is broken by a vector field with the wrong-sign mass term and it has been shown to have additional graviton modes and modified dispersion relations. In this paper we study the evolution of a homogeneous and isotropic universe in the presence of such a vector field with a minimum lying along the time-like direction. A plethora of different regimes is identified, such as accelerated expansion, loitering, collapse and tracking. |
| first_indexed | 2024-03-06T18:21:31Z |
| format | Journal article |
| id | oxford-uuid:06751430-50d1-4e07-8840-e7cee90e3787 |
| institution | University of Oxford |
| last_indexed | 2024-03-06T18:21:31Z |
| publishDate | 2006 |
| record_format | dspace |
| spelling | oxford-uuid:06751430-50d1-4e07-8840-e7cee90e37872022-03-26T09:02:42ZThe Cosmology of a Universe with Spontaneously-Broken Lorentz SymmetryJournal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:06751430-50d1-4e07-8840-e7cee90e3787Symplectic Elements at Oxford2006Ferreira, PGripaios, BSaffari, RZlosnik, TA self consistent effective field theory of modified gravity has recently been proposed with spontaneous breaking of local Lorentz invariance. The symmetry is broken by a vector field with the wrong-sign mass term and it has been shown to have additional graviton modes and modified dispersion relations. In this paper we study the evolution of a homogeneous and isotropic universe in the presence of such a vector field with a minimum lying along the time-like direction. A plethora of different regimes is identified, such as accelerated expansion, loitering, collapse and tracking. |
| spellingShingle | Ferreira, P Gripaios, B Saffari, R Zlosnik, T The Cosmology of a Universe with Spontaneously-Broken Lorentz Symmetry |
| title | The Cosmology of a Universe with Spontaneously-Broken Lorentz Symmetry |
| title_full | The Cosmology of a Universe with Spontaneously-Broken Lorentz Symmetry |
| title_fullStr | The Cosmology of a Universe with Spontaneously-Broken Lorentz Symmetry |
| title_full_unstemmed | The Cosmology of a Universe with Spontaneously-Broken Lorentz Symmetry |
| title_short | The Cosmology of a Universe with Spontaneously-Broken Lorentz Symmetry |
| title_sort | cosmology of a universe with spontaneously broken lorentz symmetry |
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