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• W2034674552 abstract "We generalize the perturbations theory of loop quantum cosmology to a hydrodynamical form and define an effective curvature perturbation on a uniform-density hypersurfaces ${ensuremath{zeta}}_{e}$. As in the classical cosmology, ${ensuremath{zeta}}_{e}$ should be gauge-invariant and conservative on the large scale. The evolutions of both the adiabatic and the nonadiabatic perturbations for a multifluid model are investigated in the framework of the effective hydrodynamical theory of loop quantum cosmology with the inverse-triad correction. We find that, different from the classical cosmology, the evolution of the large-scale nonadiabatic entropy perturbation can be driven by an adiabatic curvature perturbation and this adiabatic source for the nonadiabatic perturbation is a quantum effect. As an application of the related formalism, we study a decay model and give out the numerical results." @default.
• W2034674552 created "2016-06-24" @default.
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• W2034674552 date "2012-01-12" @default.
• W2034674552 modified "2023-10-16" @default.
• W2034674552 title "Adiabatic and nonadiabatic perturbations for loop quantum cosmology" @default.
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• W2034674552 doi "https://doi.org/10.1103/physrevd.85.023515" @default.
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