Dynamical scalar degree of freedom in Horava-Lifshitz gravity

By R. Cai, Bin Hu, Hong-bo Zhang. 2009

136 citations recorded by the source corpus.

We investigate the linear cosmological perturbations of Horcava-Lifshitz gravity in a Friedmann-Robertson-Walker universe without any matter. Our results show that a new gauge-invariant dynamical scalar mode emerges, due to the gauge transformation under the "foliation-preserving" diffeomorphism and "projectability condition," and it can produce a scale invariant power spectrum. In the infrared regime with lambda=1, the dynamical scalar degree of freedom turns to be a nondynamical one at the linear order level.

Subfields: Astronomy and Astrophysics, Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/8b34b67dfc6f852bd71582bf9a67b731904f1cc5

How researchers see this paper

The researchers whose trusted networks rank it highest, strongest advocate first. Every researcher gets a different order.

In Astronomy and Astrophysics

1. T. Clifton
2. Pedro G. Ferreira
3. Antonio Padilla
4. C. Skordis
5. Lavinia Heisenberg
6. Tsutomu Kobayashi
7. K. Koyama

In Nuclear and High Energy Physics

1. T. Clifton
2. Antonio Padilla
3. Pedro G. Ferreira
4. C. Skordis
5. Lavinia Heisenberg
6. K. Koyama

Citations in the corpus

• Modified Gravity and Cosmology (2011, background): “Note that this hard breaking of diffeomorphism invariance is at the root of many of the problems facing HL gravity as it allows additional degrees of freedom to propagate [205, 248].”
• Hořava-Lifshitz gravity from dynamical Newton-Cartan geometry (2015, unknown): “[38, 39, 40, 41, 42, 43, 44, 45].”