Inflationary correlation functions without infrared divergences

Inflationary correlation functions without infrared divergences
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无红外散度的暴胀相关函数

DOI:
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发表时间:
2011
期刊:
影响因子:
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通讯作者:
G. Tasinato
G. Tasinato
中科院分区:
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文献类型:
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作者:
Mischa Gerstenlauer;A. Hebecker;G. Tasinato

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暴胀相关函数可能受到红外发散的影响。例如,在动量k处的曲率扰动的两点相关器接收校正~ ln(kL),其中L是执行测量的区域的大小。我们定义了红外安全的相关函数,它对用于观察的盒子的大小L不敏感。传统的双折射器及其常见的对数增强校正(标量和张量长波长模式)很容易从我们的红外安全相关函数中恢复。在其他的例子中,我们说明了这一点,通过计算来自长波长张量模式的非高斯参数fNL的校正。在我们的方法中,IR校正自动出现在一个图解,所有订单的形式。对于标量校正,可以显式地评估所得到的全阶表达式。
Inflationary correlation functions are potentially affected by infrared divergences. For example, the two-point correlator of curvature perturbation at momentum k receives corrections ~ ln (kL), where L is the size of the region in which the measurement is performed. We define infrared-safe correlation functions which have no sensitivity to the size L of the box used for the observation. The conventional correlators with their familiar log-enhanced corrections (both from scalar and tensor long-wavelength modes) are easily recovered from our IR-safe correlation functions. Among other examples, we illustrate this by calculating the corrections to the non-Gaussianity parameter fNL coming from long-wavelength tensor modes. In our approach, the IR corrections automatically emerge in a resummed, all-orders form. For the scalar corrections, the resulting all-orders expression can be evaluated explicitly.
DOI: 10.1088/0067-0049/192/2/18
发表时间: 2011-02-01
影响因子: 8.7
作者:
Komatsu, E.;Smith, K. M.;Wright, E. L.
通讯作者: Wright, E. L.
DOI: 10.1016/j.physletb.2010.09.050
发表时间: 2010
期刊: Fuel and Energy Abstracts
影响因子: --
作者:
E.O. Kahya;V.K. Onemli;R.P. Woodard
通讯作者: R.P. Woodard