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Cosmological perturbations in a healthy extension of Horava gravity · Around

2010

Cosmological perturbations in a healthy extension of Horava gravity

Kobayashi, Tsutomu, Urakawa, Yuko, Yamaguchi, Masahide

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In Horava's theory of gravity, Lorentz symmetry is broken in exchange for renormalizability, but the original theory has been argued to be plagued with problems associated with a new scalar mode stemming from the very breaking of Lorentz symmetry.

Recently, Blas, Pujolas, and Sibiryakov have proposed a healthy extension of Horava gravity, in which the behavior of the scalar mode is improved.
In this paper, we study scalar modes of cosmological perturbations in extended Horava gravity.
The evolution of metric and density perturbations is addressed analytically and numerically.

Built on

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Then

D. Blas, O. Pujolas and S. Sibiryakov, JHEP 0910
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2009
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S. Mukohyama, JCAP 0909
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2009
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T. Kobayashi, Y. Urakawa and M. Yamaguchi, JCAP 0911
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Y. S. Piao, Phys. Lett. B 681
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2009
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T. P. Sotiriou, M. Visser and S. Weinfurtner, Phys. Rev. Lett. 102
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2010

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