scholarly journals Bouncing cosmology in f(R,G) gravity by order reduction

2020 ◽  
Vol 419 ◽  
pp. 168231
Author(s):  
Bruno J. Barros ◽  
Elsa M. Teixeira ◽  
Daniele Vernieri
Author(s):  
Francesco Bajardi ◽  
Daniele Vernieri ◽  
Salvatore Capozziello

AbstractWe consider f(Q) extended symmetric teleparallel cosmologies, where Q is the non-metricity scalar, and constrain its functional form through the order reduction method. By using this technique, we are able to reduce and integrate the field equations and thus to select the corresponding models giving rise to bouncing cosmology. The selected Lagrangian is then used to develop the Hamiltonian formalism and to obtain the Wave Function of the Universe which suggests that classical observable universes can be recovered according to the Hartle Criterion.


Author(s):  
Vladimir Lantsov ◽  
A. Papulina

The new algorithm of solving harmonic balance equations which used in electronic CAD systems is presented. The new algorithm is based on implementation to harmonic balance equations the ideas of model order reduction methods. This algorithm allows significantly reduce the size of memory for storing of model equations and reduce of computational costs.


2011 ◽  
Vol 31 (4) ◽  
pp. 1006-1009
Author(s):  
Ning GUO ◽  
Xiao-yan SUN ◽  
He LIN ◽  
Hua MOU

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