Primordial non-Gaussianity from G inflation

Journal Article · Sun May 15 00:00:00 EDT 2011 · Physical Review. D, Particles Fields

DOI:https://doi.org/10.1103/PHYSREVD.83.103524· OSTI ID:21502567

Kobayashi, Tsutomu ^[1]; Yamaguchi, Masahide ^[2]; Yokoyama, Jun'ichi ^[1]

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1. Research Center for the Early Universe (RESCEU), Graduate School of Science, University of Tokyo, Tokyo 113-0033 (Japan)
2. Department of Physics, Tokyo Institute of Technology, Tokyo 152-8551 (Japan)

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){open_square}{phi} with X=-({partial_derivative}{phi}){sup 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.

• OSTI ID: 21502567
• Journal Information: Physical Review. D, Particles Fields, Vol. 83, Issue 10; Other Information: DOI: 10.1103/PhysRevD.83.103524; (c) 2011 American Institute of Physics; ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
AMPLITUDES
COMPUTERIZED SIMULATION
FIELD EQUATIONS
FLUCTUATIONS
LAGRANGIAN FUNCTION
SCALAR FIELDS
SCALE INVARIANCE
SOUND WAVES
SPECTRA
EQUATIONS
FUNCTIONS
INVARIANCE PRINCIPLES
SIMULATION
VARIATIONS