Enhancement of non-Gaussianity after inflation
Aug, 2003
12 pages
Published in:
- JHEP 04 (2004) 006
e-Print:
- astro-ph/0308088 [astro-ph]
Report number:
- DFPD-A-03-32
View in:
Citations per year
Abstract: (arXiv)
We study the evolution of cosmological perturbations on large scales, up to second order, for a perfect fluid with generic equation of state. Taking advantage of super-horizon conservation laws, it is possible to follow the evolution of the non-Gaussianity of perturbations through the different stages after inflation. We find that a large non-linearity is generated by the gravitational dynamics from the original inflationary quantum fluctuations. This leads to a significant enhancement of the tiny intrinsic non-Gaussianity produced during inflation in single-field slow-roll models.- inflation
- fluid
- effect: nonlinear
- space-time: Robertson-Walker
- space-time: perturbation
- tensor: energy-momentum
- Einstein equation
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