When we try to find the statistical correlation of some perturbation between two positions, we always calculate the quantum 2-point function. Are these two concepts really the same?(adsbygoogle = window.adsbygoogle || []).push({});

Also, people say vaccum fluctuation is gaussian. For normalized fields, we always use Bunch-Davies initial condition ##\frac{1}{\sqrt{2k}}e^{-i k \tau}##. So in which sense do we say it is gaussian?

Thanks! Any reference would be appreciated!

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# Variance and 2 point function in perturbation theory

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