期刊
PHYSICAL REVIEW LETTERS
卷 105, 期 23, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.105.231302
关键词
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资金
- JSPS [19340054, 21740187, 21111006]
- Grants-in-Aid for Scientific Research [21111006, 21740187] Funding Source: KAKEN
We propose a new class of inflation model, G inflation, which has a Galileon-like nonlinear derivative interaction of the form G(phi, (del phi)(2))square phi in the Lagrangian with the resultant equations of motion being of second order. It is shown that ( almost) scale-invariant curvature fluctuations can be generated even in the exactly de Sitter background and that the tensor-to-scalar ratio can take a significantly larger value than in the standard inflation models, violating the standard consistency relation. Furthermore, violation of the null energy condition can occur without any instabilities. As a result, the spectral index of tensor modes can be blue, which makes it easier to observe quantum gravitational waves from inflation by the planned gravitational-wave experiments such as LISA and DECIGO as well as by the upcoming CMB experiments such as Planck and CMBpol.
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