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