Cosmology of the Lifshitz universe
Abstract
We study the ultraviolet complete non-relativistic theory recently proposed by Hořava. After introducing a Lifshitz scalar for a general background, we analyze the cosmology of the model in Lorentzian and Euclidean signature. Vacuum solutions are found and it is argued the existence of non-singular bouncing profiles. We find a general qualitative agreement with both the picture of Causal Dynamical Triangulations and Quantum Einstein Gravity. However, inflation driven by a Lifshitz scalar field on a classical background might not produce a scale-invariant spectrum when the principle of detailed balance is assumed.
- Publication:
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Journal of High Energy Physics
- Pub Date:
- September 2009
- DOI:
- 10.1088/1126-6708/2009/09/112
- arXiv:
- arXiv:0904.0829
- Bibcode:
- 2009JHEP...09..112C
- Keywords:
-
- High Energy Physics - Theory;
- Astrophysics - Cosmology and Extragalactic Astrophysics;
- General Relativity and Quantum Cosmology
- E-Print:
- 23 pages. v2: one reference and one equation added, main conclusions unchanged