Astronomy and Astrophysics – Astrophysics
Scientific paper
Jul 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011raa....11..759r&link_type=abstract
Research in Astronomy and Astrophysics, Volume 11, Issue 7, pp. 759-766 (2011).
Astronomy and Astrophysics
Astrophysics
3
Scientific paper
Recent astrophysical measurements strongly suggest the existence of a missing energy component dubbed dark energy that is responsible for the current accelerated expansion of the universe. A new class of modified gravity theory is introduced which yields a universe accelerating in time and dominated by dark energy. The new modified gravity model constructed here concurrently includes a Gauss-Bonnet invariant term, barotropic fluid with a time-dependent equation of state parameter, a Coleman-Weinberg (CW) potential-like expression V(varphi) = ξvarphim ln varphin and a new Einstein-Hilbert term f(R, varphi) = E(varphi)R which depends on both the scalar curvature and the scalar field varphi through a generic logarithmic function E(varphi) = ln varphi. Here m and n take different values from the standard CW potential and ξ is a real parameter. It was shown that the presence of these terms provides many useful features which are discussed in some detail.
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