Classicalization of Quantum Fluctuation in Inflationary Universe : Astrophysics and Relativity

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We discuss the classicalization of a quantum state induced by an environment in the inflationary stage of the universe. The classicalization is necessary for the homogeneous ground state to become the inhomogeneous classical one accompanied with statistical fluctuations, which is a plausible candidate for the seeds of structure formation. Using simple models, we show that i) the two classicalization criteria, the classical correlation and quantum decoherence, are simultaneously satisfied by the environment and that ii) the power spectrum of the resultant statistical fluctuations depends upon the details of the classicalization process. In particular, the result ii) means that, taking into account the classicalization process, the inflationary scenario does not necessarily predict the unique spectrum which is usually believed.
理論物理学刊行会の論文
1997-11-25