Emergent universe in theories with natural UV cutoffs
Mohsen Khodadi,Kourosh Nozari,Kourosh Nozari,Emmanuel N. Saridakis,Emmanuel N. Saridakis,Emmanuel N. Saridakis +5 more
TLDR
In this article, the authors 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.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.read more
Citations
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Planck scale effects on the stochastic gravitational wave background generated from cosmological hadronization transition: A qualitative study
TL;DR: In this article, it was shown that incorporating the natural cutoffs into the MIT bag equation of state and background evolution leads to a growth in the stochastic gravitational power spectrum, while the relevant redshift of the QCD era remains unaltered.
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Implications of minimum and maximum length scales in cosmology
TL;DR: In this paper, the authors investigated the cosmological implications of the generalized and extended uncertainty principle (GEUP), and whether it could provide an explanation for the dark energy, and they found that the GEUP is the existence of a minimum and a maximum length, which can in turn modify the entropy area law and also modify the Friedmann equation.
Probing Planck-scale physics with quantum optics
Igor Pikovski,Michael R. Vanner,Markus Aspelmeyer,Myungshik Kim,Časlav Brukner,Časlav Brukner +5 more
TL;DR: In this article, a quantum optical control and readout of a quantum oscillator with a mass close to the Planck mass is used to explore possible deviations from the quantum commutation relation.
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Emergent universe from Energy-Momentum Squared Gravity
TL;DR: In this paper , the authors develop an emergent universe scenario within a covariant extension of General Relativity known as Energy-Momentum Squared Gravity (EMG), which bypasses the big bang singularity.
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Power spectrum of primordial perturbations for an emergent universe in quantum reduced loop gravity.
Javier Olmedo,Emanuele Alesci +1 more
TL;DR: In this article, the dynamics and predictions of a new emergent-universe model based on the so-called statistical regularization scheme have been studied, and it is shown that this is always the case when the matter content is a minimally coupled scalar field subject to a quadratic potential.
References
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TL;DR: A new inflationary universe scenario is suggested in this paper, which is free of the shortcomings of the previous one and provides a possible solution of the horizon, flatness, homogeneity and isotropy problems in cosmology.
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TL;DR: Extended Theories of Gravity as discussed by the authors can be considered as a new paradigm to cure shortcomings of General Relativity at infrared and ultraviolet scales, which is an approach that, by preserving the undoubtedly positive results of Einstein's theory, is aimed to address conceptual and experimental problems recently emerged in astrophysics, cosmology and High Energy Physics.