Super-Hubble nonlinear perturbations during inflation
We show that the nonlinear evolution of long-wavelength perturbations may be important in a wide class of inflationary scenarios. We develop a solution for the evolution of such nonlinear perturbations which is exact to first order in a gradient expansion. As a first application, we demonstrate that in single field models of inflation there can be no parametric amplification of super-Hubble modes during reheating. We consider the implications of the solution for recent discussions of the back-reaction effect of long wavelength perturbations on the background geometry, give a new derivation of the equation of motion of stochastic inflation, and demonstrate that if the (generalized) slow-rolling condition is not satisfied, then inevitably long wavelength vector modes for gravitational fluctuations will be generated.
- Sponsoring Organization:
- (US)
- OSTI ID:
- 40203090
- Journal Information:
- Physical Review D, Vol. 63, Issue 12; Other Information: DOI: 10.1103/PhysRevD.63.123505; Othernumber: PRVDAQ000063000012123505000001; 039112PRD; PBD: 15 Jun 2001; ISSN 0556-2821
- Publisher:
- The American Physical Society
- Country of Publication:
- United States
- Language:
- English
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