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String-inspired Gauss-Bonnet gravity reconstructed from the universe expansion history and yielding the transition from matter dominance to dark energy
Guido Cognola, Emilio Elizalde, Shin'ichi Nojiri +2
We consider scalar-Gauss-Bonnet and modified Gauss-Bonnet gravities and reconstruct these theories from the universe expansion history. In particular, we are able to construct vers…
Dark energy in modified Gauss-Bonnet gravity: late-time acceleration and the hierarchy problem
Guido Cognola, Emilio Elizalde, Shin'ichi Nojiri +2
Dark energy cosmology is considered in a modified Gauss-Bonnet (GB) model of gravity where an arbitrary function of the GB invariant, , is added to the General Relativity act…
Heat-kernel expansion on non compact domains and a generalised zeta-function regularisation procedure
Guido Cognola, Emilio Elizalde, Sergio Zerbini
Heat-kernel expansion and zeta function regularisation are discussed for Laplace type operators with discrete spectrum in non compact domains. Since a general theory is lacking, th…