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- W2098511341 endingPage "020" @default.
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- W2098511341 abstract "A diagrammatic approach to calculate n-point correlators of the primordial curvature perturbation ζ was developed a few years ago following the spirit of the Feynman rules in Quantum Field Theory. The methodology is very useful and time-saving, as it is for the case of the Feynman rules in the particle physics context, but, unfortunately, is not very well known by the cosmology community. In the present work, we extend such an approach in order to include not only scalar field perturbations as the generators of ζ, but also vector field perturbations. The purpose is twofold: first, we would like the diagrammatic approach (which we would call the Feynman-like rules) to become widespread among the cosmology community; second, we intend to give an easy tool to formulate any correlator of ζ for those cases that involve vector field perturbations and that, therefore, may generate prolonged stages of anisotropic expansion and/or important levels of statistical anisotropy. Indeed, the usual way of formulating such correlators, using the Wick's theorem, may become very clutter and time-consuming." @default.
- W2098511341 created "2016-06-24" @default.
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- W2098511341 date "2011-10-17" @default.
- W2098511341 modified "2023-10-16" @default.
- W2098511341 title "Feynman-like rules for calculatingn-point correlators of the primordial curvature perturbation" @default.
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- W2098511341 doi "https://doi.org/10.1088/1475-7516/2011/10/020" @default.
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