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arXiv 1406.6243hep-phastro-ph.CO
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宇宙再加热和模量衰变的有限密度效应及其对暗物质产生的影响

On finite density effects on cosmic reheating and moduli decay and implications for Dark Matter production

Marco Drewes

摘要:

本文研究了Friedmann-Robertson-Walker时空中振荡标量场的微扰阻尼,并考虑了衰减产物与等离子体相互作用对阻尼率的有限密度效应.标量场可以等同于暴胀子,在这种情况下,这个过程会导致宇宙在暴胀后的再加热。它也可以类似于一个模量,在以后的时间里支配宇宙的能量密度。我们发现,阻尼率的有限密度修正可以有一个激烈的热历史的影响,并大大增加,在早期宇宙的最高温度和再加热温度在辐射主导时代的开始。因此,某些候选暗物质的丰度可能比先前估计的要大得多。我们给出了最高温度和再热温度的改进的解析估计,并在一个简单的模型中进行了数值验证。

英文摘要:

We study the damping of an oscillating scalar field in a Friedmann-Robertson-Walker spacetime by perturbative processes, taking into account the finite density effects that interactions with the plasma of decay products have on the damping rate. The scalar field may be identified with the inflaton, in which case this process leads to the reheating of the universe after inflation. It can also resemble a modulus that dominates the energy density of the universe at later times. We find that the finite density corrections to the damping rate can have a drastic effect on the thermal history and considerably increase both, the maximal temperature in the early universe and the reheating temperature at the onset of the radiation dominated era. As a result abundance of some Dark Matter candidates may be considerably larger than previously estimated. We give improved analytic estimates for the maximal and the reheating temperatures and confirm them numerically in a simple model.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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