Gravitational Waves From the End of Inflation: Computational Strategies

Details Gravitational Waves From the End of Inflation: Computational Strategies Gravitational Waves From the End of Inflation: Computational Strategies

2007-12-18

arxiv.org/abs/0712.2991v1

Phys.Rev.D77:103519,2008

Astronomy and Astrophysics

Astrophysics

15 pages, 13 figures

Scientific paper

10.1103/PhysRevD.77.103519

Parametric resonance or preheating is a plausible mechanism for bringing about the transition between the inflationary phase and a hot, radiation dominated universe. This epoch results in the rapid production of heavy particles far from thermal equilibrium and could source a significant stochastic background of gravitational radiation. Here, we present a numerical algorithm for computing the contemporary power spectrum of gravity waves generated in this post-inflationary phase transition for a large class of scalar-field driven inflationary models. We explicitly calculate this spectrum for both quartic and quadratic models of chaotic inflation, and low-scale hybrid models. In particular, we consider hybrid models with an ``inverted'' potential. These models have a very short and intense period of resonance which is qualitatively different from previous examples studied in this context, but we find that they lead to a similar spectrum of gravitational radiation.

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