Primordial non-Gaussianity from G inflation

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Abstract

We present a comprehensive study of primordial fluctuations generated from G inflation, in which the inflaton Lagrangian is of the form K(ϕ,X)-G(ϕ,X)□ϕ with X=-(∂ϕ)[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.

Journal

  • Physical Review D

    Physical Review D 83(10), 2011-05

    American Physical Society

Codes

  • NII Article ID (NAID)
    120003338844
  • NII NACSIS-CAT ID (NCID)
    AA00773624
  • Text Lang
    ENG
  • Article Type
    journal article
  • ISSN
    1550-7998
  • Data Source
    IR 
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