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arXiv 1207.0445hep-phastro-ph.COhep-th
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低温暖膨胀中的广义耗散系数

General dissipation coefficient in low-temperature warm inflation

Mar Bastero-Gil, Arjun Berera, Rudnei O. Ramos, Joao G. Rosa

摘要:

在一般粒子物理模型中,暴胀子场与其他玻色子场和费米子场耦合,这些场在暴胀期间获得大质量,并可能衰减到光自由度。这导致耗散效应,改变了膨胀动力学,并可能产生一个近热辐射浴,这样膨胀发生在温暖的环境中,而不是过冷的环境。在这项工作中,我们进行了数值计算,并获得相关的耗散系数在超对称模型的表达式,专注于政权的辐射温度低于重质量阈值。耗散系数接收的贡献,从上壳和壳外自由度,这是占主导地位的小和大的耦合,分别考虑到光场的多重性的衰减。特别是,我们发现,从上壳衰变的贡献,虽然玻尔兹曼抑制,可以远远大于虚模,这是有限的微扰分析的有效性。这一结果为在超对称场论中实现热暴胀提供了新的可能性。

英文摘要:

In generic particle physics models, the inflaton field is coupled to other bosonic and fermionic fields that acquire large masses during inflation and may decay into light degrees of freedom. This leads to dissipative effects that modify the inflationary dynamics and may generate a nearly-thermal radiation bath, such that inflation occurs in a warm rather than supercooled environment. In this work, we perform a numerical computation and obtain expressions for the associated dissipation coefficient in supersymmetric models, focusing on the regime where the radiation temperature is below the heavy mass threshold. The dissipation coefficient receives contributions from the decay of both on-shell and off-shell degrees of freedom, which are dominant for small and large couplings, respectively, taking into account the light field multiplicities. In particular, we find that the contribution from on-shell decays, although Boltzmann-suppressed, can be much larger than that of virtual modes, which is bounded by the validity of a perturbative analysis. This result opens up new possibilities for realizations of warm inflation in supersymmetric field theories.

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