Constraining curvatonic reheating

Constraining curvatonic reheating
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限制曲线再加热

DOI:
10.1088/1475-7516/2016/08/042
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发表时间:
2016
影响因子:
6.4
通讯作者:
Hardwick R
Hardwick R
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Hardwick R

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我们推导出第一个系统的观测约束再加热模型的膨胀,其中一个额外的光标量场有助于原始密度扰动和影响膨胀的历史再加热过程中。这包含了原始的曲率模型,但也涵盖了更大类的场景。我们发现,相比于单场的情况下,较低的值的能量密度在年底的通货膨胀和再加热温度是首选时,引入一个额外的标量场。例如,如果暴胀是由一个四次势驱动的,这是一个在加入轻标量场时最受欢迎的模型之一,则导出了再加热温度Treh的上界Treh < 5× 104GeV,并讨论了这个值对后暴胀物理的意义.关于再加热获得的信息也被量化,它被发现,它仍然温和的高原通货膨胀(虽然仍然大于在单场版本的模型),但可以成为大量的四次通货膨胀。在通货膨胀结束时的附加标量场的vev所发挥的作用被强调,并打开有趣的可能性,探索随机通货膨胀的影响,可以确定其分布。
We derive the first systematic observational constraints on reheating in models of inflation where an additional light scalar field contributes to primordial density perturbations and affects the expansion history during reheating. This encompasses the original curvaton model but also covers a larger class of scenarios. We find that, compared to the single-field case, lower values of the energy density at the end of inflation and of the reheating temperature are preferred when an additional scalar field is introduced. For instance, if inflation is driven by a quartic potential, which is one of the most favoured models when a light scalar field is added, the upper bound T reh< 5× 10 4 GeV on the reheating temperature T reh is derived, and the implications of this value on post-inflationary physics are discussed. The information gained about reheating is also quantified and it is found that it remains modest in plateau inflation (though still larger than in the single-field version of the model) but can become substantial in quartic inflation. The role played by the vev of the additional scalar field at the end of inflation is highlighted, and opens interesting possibilities for exploring stochastic inflation effects that could determine its distribution.
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