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
中科院分区:
文献类型:
--
作者:
Hardwick R
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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DOI:
--
发表时间:
2016
期刊:
影响因子:
--
作者:
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通讯作者:
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DOI:
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Physical Review D, Particles and fields
影响因子:
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影响因子:
6.4
作者:
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影响因子:
6.4
作者:
Hardwick R
通讯作者:
Hardwick R