Non-Gaussian inflationary shapes in theories beyond Horndeski
Jul 27, 2014
17 pages
Published in:
- JCAP 10 (2014) 037
- Published: Oct 15, 2014
e-Print:
- 1407.7280 [astro-ph.CO]
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Abstract: (IOP)
We consider the possible signatures of a recently introduced class of healthy theories beyond Horndeski models on higher-order correlators of the inflationary curvature fluctuation. Despite the apparent large number and complexity of the cubic interactions, we show that the leading-order bispectrum generated by the Generalized Horndeski (also called G(3)) interactions can be reduced to a linear combination of two well known k-inflationary shapes. We conjecture that said behavior is not an accident of the cubic order but a consequence dictated by the requirements on the absence of Ostrogradski instability, the general covariance and the linear dispersion relation in these theories.Note:
- 17 pages. Analysis expanded and some references added
- modified gravity
- inflation
- non-gaussianity
- cosmological perturbation theory
- inflation: correlation function
- inflation: non-Gaussianity
- correlation function: higher-order
- dispersion relation: linear
- curvature: fluctuation
- gravitation: model
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