Cosmological perturbations in Horava-Lifshitz theory without detailed balance
- GCAP-CASPER, Physics Department, Baylor University, Waco, Texas 76798-7316 (United States)
- Institute of Cosmology and Gravitation, University of Portsmouth, Portsmouth PO1 3FX (United Kingdom)
In the Horava-Lifshitz theory of quantum gravity, two conditions - detailed balance and projectability - are usually assumed. The breaking of projectability simplifies the theory, but it leads to serious problems with the theory. The breaking of detailed balance leads to a more complicated form of the theory, but it appears to resolve some of the problems. Sotiriou, Visser and Weinfurtner formulated the most general theory of Horava-Lifshitz type without detailed balance. We compute the linear scalar perturbations of the FRW model in this form of HL theory. We show that the higher-order curvature terms in the action lead to a gravitational effective anisotropic stress on small scales. Specializing to a Minkowski background, we study the spin-0 scalar mode of the graviton, using a gauge-invariant analysis, and find that it is stable in both the infrared and ultraviolet regimes for 0{<=}{xi}{<=}2/3. However, in this parameter range the scalar mode is a ghost.
- OSTI ID:
- 21409073
- Journal Information:
- Physical Review. D, Particles Fields, Vol. 81, Issue 2; Other Information: DOI: 10.1103/PhysRevD.81.024009; (c) 2010 The American Physical Society; ISSN 0556-2821
- Country of Publication:
- United States
- Language:
- English
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ANGULAR MOMENTUM
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FIELD THEORIES
INVARIANCE PRINCIPLES
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