Origin of classical structure from inflation

Details Origin of classical structure from inflation Origin of classical structure from inflation

2000-06-19

arxiv.org/abs/astro-ph/0006252v1

Nucl.Phys.Proc.Suppl.88:255-258,2000

Astronomy and Astrophysics

Astrophysics

4 pages, needs Elsevier macro espcr2.sty, contribution to the Third Meeting on Constrained Dynamics and Quantum Gravity, Sarde

Scientific paper

10.1016/S0920-5632(00)00779-9

According to the inflationary scenario, all structure in the Universe can be traced back to quantum fluctuations of the metric and scalar field(s) during inflation. The seeds of this structure can be observed as classical anisotropies in the cosmic microwave background. I briefly review how the transition from the inherent quantum nature of these fluctuations to classical behaviour comes about. Two features play a crucial role: Firstly, the quantum state of the fluctuations becomes highly squeezed for wavelengths that exceed the Hubble radius. Secondly, decoherence due to other fields distinguishes the field-amplitude basis as the classical pointer basis. I also discuss the entropy of the fluctuations and make a brief comparison with chaotic systems.

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