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paper

Classicality of the primordial perturbations

arXiv:astro-ph/0607647 · doi:10.1016/j.physletb.2008.03.010

Abstract

We show that during inflation, a quantum fluctuation becomes classical at all orders if it becomes classical at first order. Implications are discussed.

4 pages, uses RevTeX4 LaTeX document class. v2: More details of the classicality argument, and an improved discussion of its implications. v3: matches version published in PLB