期刊
ASTROPHYSICS AND SPACE SCIENCE
卷 354, 期 2, 页码 627-632出版社
SPRINGER
DOI: 10.1007/s10509-014-2108-3
关键词
Inflation; Renormalization group; Effective Lagrangian; Spectrum index; Tensor-to-scalar ratio
资金
- JSPS KAKENHI [26400250]
- MINECO (Spain) [FIS2010-15640]
- MES (Russia) [TSPU-139]
- Grants-in-Aid for Scientific Research [26400250] Funding Source: KAKEN
- ICREA Funding Source: Custom
Inflation models can be examined by the cosmological observations, WMAP, Planck, BICEP2 and so on. These observations directly constrain the spectral index, n (s) , and the tensor-to-scalar ratio, r. Besides, from a theoretical point of view, it has been shown that any inflation models asymptote a universal attractor in (n (s) ,r) plane for a larger scalar-gravity coupling. In this work we consider a simple chaotic inflation model with a scalar quartic and a scalar-curvature interactions. The quantum corrections are introduced for these interactions through the renormalization group. The inflationary parameters, n (s) and r, are numerically calculated with shifting the bare scalar-gravity coupling xi (0), the quartic scalar bare coupling lambda (0), the renormalization scale mu and the e-folding number N. The Planck data is consistent with the I center dot (4) theory with a finite scalar-curvature coupling. It is found that the renormalization group running induces a non-universal contribution for n (s) and r. It can increase the tensor-to-scalar ratio, r, which is consistent with Planck data so that it may approach the BICEP2 data for a small renormalization scale.
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