Inflationary correlation functions without infrared divergences
Inflationary correlation functions without infrared divergences
复制标题
无红外散度的暴胀相关函数
DOI:
--
复制
发表时间:
2011
期刊:
影响因子:
--
通讯作者:
G. Tasinato
中科院分区:
文献类型:
--
作者:
Mischa Gerstenlauer;A. Hebecker;G. Tasinato
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.
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