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Unequal time correlators of stochastic scalar fields in de Sitter space

机译:De Satter Space中随机标量田的不等时间相关器

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The quantum fluctuations of a test scalar field on superhorizon scale in de Sitter spacetime can be described by an effective one-dimensional stochastic theory corresponding to a particular class of nonequilibrium dynamical systems known as the model A. Using the formulation of the latter in terms of a supersymmetric field theory, we compute various unequal time correlators at large (superhorizon) time separations and compare with existing quantum field theory computation. This includes perturbative calculations, pushed here up to three-loop order, and a nonperturbative 1 / N expansion at next-to-leading order. Exploiting the supersymmetry of the stochastic theory, we also derive a spectral representation of the field correlators and a fluctuation-dissipation relation for the infrared modes of the scalar field in de Sitter spacetime.
机译:在De Satter SpaceTime中的超高素刻度上的测试标量子场的量子波动可以通过与称为模型A的特定类非单抗动力系统相对应的有效的一维随机理论来描述。使用后者的配方 超对称场理论,我们在大(超级zon)时间分离中计算各种不等的时间相关器,并与现有量子场理论计算进行比较。 这包括扰动计算,在此推动到三环顺序,并在下面的订单下进行非恐怖式1 / n扩展。 利用随机理论的超对称,我们还导出了田间相关器的光谱表示,以及De Satter Spacetime中标量场的红外模式的波动消耗关系。

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