Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1998-09-23
Phys.Rev.Lett.82:1362-1365,1999
Physics
High Energy Physics
High Energy Physics - Phenomenology
5 pages, 2 figures, revised discussion of massless case
Scientific paper
10.1103/PhysRevLett.82.1362
We demonstrate that cosmological perturbations can undergo amplification by parametric resonance during the preheating period following inflation, even on scales larger than the Hubble radius, without violating causality. A unified description of gravitational and matter fluctuations is crucial in order to determine the strength of the instability. To extract specific signatures of the oscillating inflaton field during reheating, it is essential to focus on a variable describing metric fluctuations which is constant in the standard analyses of inflation. When doing this in the case of a massive inflaton without self coupling, we find no additional growth of super-horizon modes during reheating beyond what the usual analyses of the growth of fluctuations predict. However, for a massless self coupled inflaton, there is an initial increase in the value of the gravitational potential, which may lead to different predictions for observations.
Brandenberger Robert
Finelli Fabio
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