publication . Article . 2003

Gauge-invariant second-order perturbations and non-Gaussianity from inflation

Viviana Acquaviva; Nicola Bartolo; Sabino Matarrese; Antonio Riotto;
Open Access
  • Published: 16 Jul 2003 Journal: Nuclear Physics B, volume 667, pages 119-148 (issn: 0550-3213, Copyright policy)
  • Publisher: Elsevier BV
Abstract
We present the first computation of the cosmological perturbations generated during inflation up to second order in deviations from the homogeneous background solution. Our results, which fully account for the inflaton self-interactions as well as for the second-order fluctuations of the background metric, provide the exact expression for the gauge-invariant curvature perturbation bispectrum produced during inflation in terms of the slow-roll parameters or, alternatively, in terms of the scalar spectral $n_S$ and and the tensor to adiabatic scalar amplitude ratio $r$. The bispectrum represents a specific non-Gaussian signature of fluctuations generated by quantu...
Persistent Identifiers
Subjects
arXiv: Astrophysics::Cosmology and Extragalactic AstrophysicsGeneral Relativity and Quantum Cosmology
free text keywords: Perturbation (astronomy), Inflaton, Adiabatic process, Tensor, Inflation, media_common.quotation_subject, media_common, Cosmic microwave background, Bispectrum, Scalar (physics), Theoretical physics, Astrophysics, Physics
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