Observables for FRW model with cosmological constant in the framework of loop cosmology

Abstract

We consider a flat cosmological model with a free massless scalar field and the cosmological constant $\Lambda$ in the framework of loop quantum cosmology. The scalar field plays the role of an intrinsic time. We apply the reduced phase space approach. The dynamics of the model is solved analytically. We identify elementary observables and their algebra. The compound physical observables like the volume and the energy density of matter field are analysed. Both compound observables are bounded and oscillate in the $\Lambda <0$ case. The energy density is bounded and oscillates in the $\Lambda >0$ case. However, the volume is unbounded from above, but periodic. The difference between standard and nonstandard loop quantum cosmology is described.

10 pages, 4 figures, version accepted for publication in PRD

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• Evolution in bouncing quantum cosmology
• Minisuperspace model of compact phase space gravity
• Quantum of volume in de Sitter space
• Quantum fluctuations of the compact phase space cosmology
• Cosmological Big Bounce Transition
• Examination of the nature of the Bianchi type cosmological singularities