Predictions in multifield models of inflation
Predictions in multifield models of inflation
复制标题
通货膨胀多领域模型的预测
DOI:
10.1088/1475-7516/2014/01/028
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发表时间:
2014
影响因子:
6.4
通讯作者:
Frazer J
中科院分区:
文献类型:
--
作者:
Frazer J
This paper presents a method for obtaining an analytic expression for the density function of observables in multifield models of inflation with sum-separable potentials. The most striking result is that the density function in general possesses a sharp peak and the location of this peak is only mildly sensitive to the distribution of initial conditions. A simple argument is given for why this result holds for a more general class of models than just those with sum-separable potentials and why for such models, it is possible to obtain robust predictions for observable quantities. As an example, the joint density function of the spectral index and running in double quadratic inflation is computed. For scales leaving the horizon 55 e-folds before the end of inflation, the density function peaks at n s= 0.967 and α= 0.0006 for the spectral index and running respectively.
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