Mafalda Dias, Raquel H. Ribeiro, David Seery
We justify the `separate universe' method for the inflationary bispectrum in a multiple-field model by deriving it from an underlying quantum field theory. We work to tree-level in quantum effects but to all orders in the slow-roll expansion, with masses accommodated perturbatively. In addition to justifying the conventional formalism, our method provides a systematic basis to account for novel sources of time-dependence. We use our result to obtain the correct matching prescription between the `quantum' and `classical' parts of the separate universe computation.
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http://arxiv.org/abs/1210.7800
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