Emergent universe in theories with natural UV cutoffs. (5th December 2017)

• Record Type: Journal Article
• Authors: Khodadi, Mohsen; Nozari, Kourosh; Saridakis, Emmanuel N
• Is Part Of: Classical and quantum gravity. Volume 35:Number 1(2018:Jan.)
• Publication Date: 2017-12-05
• Subjects: modified theories of gravity -- cosmology -- particle-theory and field-theory models of the early Universe; Quantum gravity -- Periodicals; Gravitation -- Periodicals; Relativity (Physics) -- Periodicals; Space and time -- Periodicals; Periodicals; 521.1
• DOI: 10.1088/1361-6382/aa95aa
• Languages: English
• ISSNs: 0264-9381

Abstract

Abstract: We investigate the realization of the emergent universe scenario in theories with natural UV cutoffs, namely a minimum length and a maximum momentum, quantified by a new deformation parameter in the generalized uncertainty principle. We extract the Einstein static universe solutions and we examine their stability through a phase-space analysis. As we show, the role of the new deformation parameter is crucial in a twofold way: firstly, it leads to the appearance of new Einstein static universe critical points, that are absent in standard cosmology. Secondly, it provides a way for a graceful exit from the Einstein static universe into the expanding thermal history, that is needed for a complete and successful realization of the emergent universe scenario.