Minimal warm inflation

Minimal warm inflation
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最小的暖通胀

DOI:
10.1088/1475-7516/2020/03/034
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发表时间:
2020
影响因子:
6.4
通讯作者:
Kaplan, David E.
Kaplan, David E.
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Berghaus, Kim V.;Graham, Peter W.;Kaplan, David E.

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缓慢通胀是一个成功的范例。然而,我们发现,即使暴胀子与其他光场的耦合很小,也会极大地改变暴胀的动力学和预测。作为一个例子,暴胀子一般可以与规范玻色子有类似轴子的耦合。即使是相对较小的耦合也会在充气期间自动引起热浴。来自这个浴的热摩擦可以很容易地比哈勃摩擦更强,显着改变任何特定暴胀子势的通常预测。热效应抑制张量标量比r显着,并预测独特的非高斯性。这种类轴子耦合提供了一个最小的模型,避免了通常的问题,热反反应的暴胀潜力的温暖的通货膨胀。作为一个具体的例子,我们发现这种轴子耦合的混合暴胀可以很容易地适应当前的宇宙学数据。
Slow-roll inflation is a successful paradigm. However we find that even a small coupling of the inflaton to other light fields can dramatically alter the dynamics and predictions of inflation. As an example, the inflaton can generically have an axion-like coupling to gauge bosons. Even relatively small couplings will automatically induce a thermal bath during inflation. The thermal friction from this bath can easily be stronger than Hubble friction, significantly altering the usual predictions of any particular inflaton potential. Thermal effects suppress the tensor-to-scalar ratio r significantly, and predict unique non-gaussianities. This axion-like coupling provides a minimal model of warm inflation which avoids the usual problem of thermal backreaction on the inflaton potential. As a specific example, we find that hybrid inflation with this axion-like coupling can easily fit the current cosmological data.
温暖的自然通货膨胀
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