| Issue |
EPL
Volume 101, Number 3, February 2013
|
|
|---|---|---|
| Article Number | 39001 | |
| Number of page(s) | 4 | |
| Section | Geophysics, Astronomy and Astrophysics | |
| DOI | https://doi.org/10.1209/0295-5075/101/39001 | |
| Published online | 14 February 2013 | |
Violation of non-Gaussianity consistency relation in a single-field inflationary model
1 School of Physics, Institute for Research in Fundamental Sciences (IPM) - P. O. Box 19395-5531, Tehran, Iran
2 School of Astronomy, Institute for Research in Fundamental Sciences (IPM) - P. O. Box 19395-5531, Tehran, Iran
3 Yukawa Institute for theoretical Physics, Kyoto University - Kyoto 606-8502, Japan
Received: 20 December 2012
Accepted: 22 January 2013
In this paper we present a simple, toy model of single-field inflation in which the standard non-Gaussianity consistency condition is violated. In this model the curvature perturbations on super-horizon scales are not conserved and the decaying modes of perturbations are not negligible in the non-attractor phase. As a result a large local non-Gaussianity can be obtained in the squeezed limit which violates the standard non-Gaussianity consistency condition for the single-field models.
PACS: 98.80.Cq – Particle-theory and field-theory models of the early Universe (including cosmic pancakes, cosmic strings, chaotic phenomena, inflationary universe, etc.)
© EPLA, 2013
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