Non-Gaussian and loop effects of inflationary correlation functions in BRST formalism
Non-Gaussian and loop effects of inflationary correlation functions in BRST formalism
复制标题
BRST 形式中通货膨胀相关函数的非高斯效应和循环效应
DOI：
10.1103/physrevd.96.023535
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发表时间：
2017
期刊：
影响因子：
--
通讯作者：
Ryota Kojima
中科院分区：
文献类型：
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作者：
Hiroyuki Kitamoto ;Yoshihisa Kitazawa ;Ryota Kojima
本文研究了单场暴胀模型中的暴胀关联函数。我们采用了BRST形式主义的局部性和协方差在subhorizon尺度是显而易见的。标量和张量微扰与在宇宙视界外成为常数的同动规范中的微扰一致。我们的构造再现了与标准随动规范相同的非高斯性。几乎标度不变的波动的积累可能会引起环路级的IR对数校正。我们调查的影响，这种影响的视界下的动力学。由于这样的效果必须尊重协方差，我们的BRST规范有一个优势，比标准的共动规范。我们估计IR对数效应的慢滚参数在一个循环的水平。我们表明，接收IR对数校正，而这不是情况。我们指出，IR对数效应提供了移位对称性破缺机制。这种情况可能导致一个具有线性势的通货膨胀模型。
We investigate inflationary correlation functions in single-field inflation models. We adopt a BRST formalism where locality and covariance at the subhorizon scale are manifest. The scalar and tensor perturbations are identified with those in the comoving gauge which become constant outside the cosmological horizon. Our construction reproduces the identical non-Gaussianity with the standard comoving gauge. The accumulation of almost scale-invariant fluctuations could give rise to IR logarithmic corrections at the loop level. We investigate the influence of this effect on the subhorizon dynamics. Since such an effect must respect covariance, our BRST gauge has an advantage over the standard comoving gauge. We estimate IR logarithmic effects to the slow-roll parameters at the one-loop level. We show thatreceives IR logarithmic corrections, while this is not the case for. We point out that IR logarithmic effects provide the shift-symmetry-breaking mechanism. This scenario may lead to an inflation model with a linear potential.