Abstract
We discuss in this letter a new cosmological model including both a non-linear derivative interaction and a Gauss–Bonnet invariant. The first interaction term appears in the theory with the Galilean shift symmetry, whereas the second term is motivated from string theory and plays a crucial role in Chern–Simons gravitational theories as well as in the renormalization of quantum field theories in curved spacetime. It is shown that the presence of both the cubic interaction and the Gauss–Bonnet invariant term supply amazingly prosperous cosmological phenomenologies, which are explored in some detail.
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El-Nabulsi, A.R. Accelerated expansion from non-linear derivative interaction and Gauss–Bonnet invariant. Astrophys Space Sci 326, 175–179 (2010). https://doi.org/10.1007/s10509-010-0289-y
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DOI: https://doi.org/10.1007/s10509-010-0289-y