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Emergence of classicality for primordial fluctuations: Concepts and analogies | | C. Kiefer
; D. Polarski
; | | Date: |
6 May 1998 | | Journal: | Annalen Phys. 7 (1998) 137-158 | | Subject: | gr-qc astro-ph quant-ph | | Abstract: | We clarify the way in which cosmological perturbations of quantum origin, produced during inflation, assume classical properties. Two features play an important role in this process: First, the dynamics of fluctuations which are presently on large cosmological scales leads to a very peculiar state (highly squeezed) that is indistinguishable, in a precise sense, from a classical stochastic process. This holds for almost all initial quantum states. Second, the process of decoherence by interaction with the environment distinguishes the field amplitude basis as a robust pointer basis. We discuss in detail the interplay between these features and use simple analogies such as the free quantum particle to illustrate the main conceptual issues. | | Source: | arXiv, gr-qc/9805014 | | Services: | Forum | Review | PDF | Favorites | |
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