Abstract
How the time evolution which is typical for classical cosmology emerges from quantum cosmology? The answer is not trivial because the Wheeler-DeWitt equation is time independent. A framework associating the quantum Hamilton-Jacobi to the minisuperspace cosmological models has been introduced in Fathi et al. (Eur. Phys. J. C 76, 527 2016). In this paper we show that time dependence and quantum-classical correspondence both arise naturally in the quantum Hamilton-Jacobi formalism of quantum mechanics, applied to quantum cosmology. We study the quantum Hamilton-Jacobi cosmology of spatially flat homogeneous and isotropic early universe whose matter content is a perfect fluid. The classical cosmology emerge around one Planck time where its linear size is around a few millimeter, without needing any classical inflationary phase afterwards to make it grow to its present size.
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Fathi, M., Jalalzadeh, S. Quantum Hamilton-Jacobi Cosmology and Classical-Quantum Correlation. Int J Theor Phys 56, 2167–2177 (2017). https://doi.org/10.1007/s10773-017-3363-1
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DOI: https://doi.org/10.1007/s10773-017-3363-1