Understand
Dark energy cosmology is considered in a modified Gauss-Bonnet model of gravity with and without a scalar field.
- It is shown that these generalizations of General Relativity endow it with a very rich cosmological structure: it may naturally lead to an effective cosmological constant, quintessence or phantom cosmic acceleration, with the possibility to describe the transition from a decelerating to an accelerating phase explicitly.
- It is demonstrated here that these modified GB and scalar-GB theories are perfectly viable as cosmological models.
- They can describe the LambdaCDM cosmological era without any need for a cosmological constant.
Reading the bibliography…