Multiple spectator condensates from inflation

Multiple spectator condensates from inflation
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通货膨胀导致多个观众凝结

DOI:
10.1088/1475-7516/2018/05/054
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发表时间:
2018
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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我们研究了在德西特暴胀背景下由于量子涨落引起的旁观者(光测试)场凝聚体的发展,利用随机形式来描述该系统。在这种情况下,凝聚指的是使用哈勃尺度H进行粗粒化后发现的典型场值,这对于为各种后暴胀过程所需的初始条件提供种子是必不可少的。我们研究了具有多个耦合观众的模型,并首次证明了当势不对称时存在新形式的平稳解(不同于标准指数形式)。此外,我们发现了场间耦合的临界值是场数的函数,超过这个值,静止凝析油的形成就会坍塌到h。考虑到一些简单的双场例子势,我们也能够推导出耦合的下限,在这个下限以下,波动是有效解耦的,并且每个场的标准平稳方差公式是可信的。这些结果都通过一个新的公开可用的python类(nfield)进行了数值验证,以解决大量场,实现和时间尺度上的耦合朗之万方程。本文还讨论了该新工具的进一步应用。
We investigate the development of spectator (light test) field condensates due to their quantum fluctuations in a de Sitter inflationary background, making use of the stochastic formalism to describe the system. In this context, a condensate refers to the typical field value found after a coarse-graining using the Hubble scale H, which can be essential to seed the initial conditions required by various post-inflationary processes. We study models with multiple coupled spectators and for the first time we demonstrate that new forms of stationary solution exist (distinct from the standard exponential form) when the potential is asymmetric. Furthermore, we find a critical value for the inter-field coupling as a function of the number of fields above which the formation of stationary condensates collapses to H. Considering some simple two-field example potentials, we are also able to derive a lower limit on the coupling, below which the fluctuations are effectively decoupled, and the standard stationary variance formulae for each field separately can be trusted. These results are all numerically verified by a new publicly available python class (nfield) to solve the coupled Langevin equations over a large number of fields, realisations and timescales. Further applications of this new tool are also discussed.
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