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Superbounce and Loop Quantum Cosmology Ekpyrosis from Modified Gravity · Around

2014

Superbounce and Loop Quantum Cosmology Ekpyrosis from Modified Gravity

Oikonomou, V. K.

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As is known, in modified cosmological theories of gravity many of the cosmologies which could not be generated by standard Einstein gravity, can be consistently described by $F(R)$ theories.

Using known reconstruction techniques, we investigate which $F(R)$ theories can lead to a Hubble parameter describing two types of cosmological bounces, the superbounce model, related to supergravity and non-supersymmetric models of contracting ekpyrosis and also the Loop Quantum Cosmology modified ekpyrotic model.
Since our method is an approximate method, we investigate the problem at large and small curvatures.
As we evince, both models yield power law reconstructed $F(R)$ gravities, with the most interesting new feature being that both lead to accelerating cosmologies, in the large curvature approximation.

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