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arXiv 0910.0338hep-th
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修正Horava-Lifshitz引力中标量模和张量模的功率谱

Power spectra of scalar and tensor modes in modified Horava-Lifshitz gravity

Bin Chen, Shi Pi, Jin-Zhang Tang

摘要:

在Horava-Lifshitz引力中,额外的动力学标量模在宇宙学中有着重要的作用。然而,它已被指出,这样的标量可能会遭受强耦合问题的IR。我们在本文中解决这个问题。我们的分析表明,由于额外的规范对称性,标量模在λ=1处可以自然地解耦。另一方面,当1/3<λ<1时,标量模变成鬼模的事实是对理论的真正挑战。我们试图克服这个问题,通过修改动作,使RG流位于有问题的区域之外。我们讨论的宇宙学意义的行动和计算的标量和张量模式的功率谱。

英文摘要:

In Horava-Lifshitz gravity, the extra dynamical scalar mode could play significant role in cosmology. However it has been pointed out that such a scalar may suffer from the strong coupling problem in IR. We address this issue in this paper. 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 action and calculate the power spectra of scalar and tensor modes.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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