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arXiv · 1312.3006

Non-Linear Resonance in Relativistic Preheating

Bret Underwood·Yunxiao Zhai
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Abstract

Inflation in the early Universe can be followed by a brief period of preheating, resulting in rapid and non-equilibrium particle production through the dynamics of parametric resonance. However, the parametric resonance effect is very sensitive to the linearity of the reheating sector. Additional self-interactions in the reheating sector, such as non-canonical kinetic terms like the DBI Lagrangian, may enhance or frustrate the parametric resonance effect of preheating. In the case of a DBI reheating sector, preheating is described by parametric resonance of a damped relativistic harmonic oscillator. In this paper, we illustrate how the non-linear terms in the relativistic oscillator shut down the parametric resonance effect. This limits the effectiveness of preheating when there are non-linear self-interactions.

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Bret Underwood, Yunxiao Zhai. 2014-04-02. Non-Linear Resonance in Relativistic Preheating. https://doi.org/10.1088/1475-7516%2F2014%2F04%2F002

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