Journal
PHYSICAL REVIEW D
Volume 83, Issue 10, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevD.83.103524
Keywords
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Funding
- JSPS [22840011, 19340054, 21740187]
- [21111006]
- Grants-in-Aid for Scientific Research [21111006, 22840011, 21740187] Funding Source: KAKEN
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We present a comprehensive study of primordial fluctuations generated from G inflation, in which the inflaton Lagrangian is of the form K(phi, X) = G(phi, X)square phi with X = -(partial derivative phi)(2)/2. The Lagrangian still gives rise to second-order gravitational and scalar field equations, and thus offers a more generic class of single-field inflation than ever studied, with a richer phenomenology. We compute the power spectrum and the bispectrum, and clarify how the non-Gaussian amplitude depends upon parameters such as the sound speed. In so doing we try to keep as great generality as possible, allowing for non slow-roll and deviation from the exact scale invariance.
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