On Ho<I>&#</I>345;ava-Lifshitz cosmology

CHEN Bin

doi:10.1088/1674-1137/35/5/004

Chinese Physics C> 2011, Vol. 35> Issue(5) : 429-435 DOI: 10.1088/1674-1137/35/5/004

On Hořava-Lifshitz cosmology

CHEN Bin

Department of Physics, and State Key Laboratory of Nuclear Physics and Technology, Peking University, Beijing 100871, China

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We give a brief overview of the Hořavity theory, its modifications and its implications in cosmology. In particular, we discuss the various issues on the gravitational scalar mode, including its decoupling, its role as inflaton and its stability. Our analysis shows that the scalar mode could decouple naturally at λ=1 due to the extra gauge symmetry. On the other hand, the fact that the scalar mode becomes ghost when 1/3< λ < 1 is a real challenge to the theory. We try to overcome this problem by modifying the action such that the RG flow lies outside the problematic region. We discuss the cosmological implications of the theory.

References

[1]

Lifshitz E M. Zh. Eksp. Teor. Fiz, 1941, 11: 255 2692 Horava P. arXiv:0811.2217 [hep-th]3 CHEN B, HUANG Q G. Phys. Lett. B, 2010, 683: 108-1134 Horava P. JHEP, 2009, 0903: 0205 Horava P. Phys. Rev. D, 2009, 79: 0840086 LI M, PANG Y. JHEP, 2009, 0908: 0157 LU H, MEI J, Pope C N. Phys. Rev. Lett., 2009, 103: 0913018 Sotiriou T P, Visser M, Weinfurtner S. JHEP, 2009, 0910: 0339 CHEN B, PI S, TANG J Z. arXiv:0910.0338 [hep-th]10 CAI R G, HU B, ZHANG H B. Phys. Rev. D, 2009, 80: 04150111 Charmousis C, Niz G, Padilla A, Sa n P M. JHEP, 2009, 0908: 070; Blas D, Pujolas O, Sibiryakov S. JHEP, 2009, 0910: 02912 Mukohyama S. JCAP, 2009, 0906: 00113 CHEN B, PI S, TANG J Z. JCAP, 2009, 0908: 00714 Kehagias A, Sfetsos K. Phys. Lett. B, 2009, 678: 12315 TANG J Z, CHEN B. Phys. Rev. D, 2010, 81: 04351516 Kobayashi T, Urakawa Y, Yamaguchi M. JCAP, 2009, 0911: 01517 Iengo R, Russo J G, Serone M. JHEP, 2009, 0911: 020

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CHEN Bin. On Hořava-Lifshitz cosmology[J]. Chinese Physics C, 2011, 35(5): 429-435. doi: 10.1088/1674-1137/35/5/004

CHEN Bin. On Hořava-Lifshitz cosmology[J]. Chinese Physics C, 2011, 35(5): 429-435. doi: 10.1088/1674-1137/35/5/004 shu

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Received: 2010-08-12
Revised: 2010-11-16

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通讯作者: 陈斌, bchen63@163.com

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沈阳化工大学材料科学与工程学院沈阳 110142

On Hořava-Lifshitz cosmology

Department of Physics, and State Key Laboratory of Nuclear Physics and Technology, Peking University, Beijing 100871, China

Received Date: 2010-08-12

Accepted Date: 2010-11-16

Available Online: 2011-05-05

Abstract: We give a brief overview of the Hořavity theory, its modifications and its implications in cosmology. In particular, we discuss the various issues on the gravitational scalar mode, including its decoupling, its role as inflaton and its stability. Our analysis shows that the scalar mode could decouple naturally at λ=1 due to the extra gauge symmetry. On the other hand, the fact that the scalar mode becomes ghost when 1/3< λ < 1 is a real challenge to the theory. We try to overcome this problem by modifying the action such that the RG flow lies outside the problematic region. We discuss the cosmological implications of the theory.

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