LambdaCDM epoch reconstruction from FR,G and modified Gauss-Bonnet gravities - General Relativity and Quantum CosmologyReport as inadecuate




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Abstract: Dark energy cosmology is considered in a modified Gauss-Bonnet model ofgravity with and without a scalar field. It is shown that these generalizationsof General Relativity endow it with a very rich cosmological structure: it maynaturally lead to an effective cosmological constant, quintessence or phantomcosmic acceleration, with the possibility to describe the transition from adecelerating to an accelerating phase explicitly. It is demonstrated here thatthese modified GB and scalar-GB theories are perfectly viable as cosmologicalmodels. They can describe the LambdaCDM cosmological era without any need for acosmological constant. Specific properties of these theories of gravity indifferent particular cases, such as the de Sitter one, are studied.



Author: Emilio Elizalde, Ratbay Myrzakulov, Valery V. Obukhov, Diego Sáez-Gómez

Source: https://arxiv.org/



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