Wormhole solutions and energy conditions in f(R,G)gravity  

作　　者：M Farasat Shamir G Mustafa Saad Waseem Mushtaq Ahmad 

机构地区：[1]National University of Computer and Emerging Sciences,Lahore Campus,Pakistan [2]Department of Mathematics,Shanghai University,Shanghai,200444,China [3]National University of Computer and Emerging Sciences,Chiniot-Faisalabad Campus,Pakistan

出　　处：《Communications in Theoretical Physics》2021年第11期131-141,共11页理论物理通讯（英文版）

摘　　要：In this manuscript,the traversable wormhole solutions have been explored in modified f(R,G)gravity by taking into consideration the model f(R,G)=R+rG2,where R is the Ricci curvature scalar and G is the Gauss–Bonnet term.An acceptable form of the redshift function has been incorporated which is a non-constant in nature along with the implementation of those already defined in literature,the two shape functions namely b(r)=r/exp(r-r0)and b(r)=r0log(r+1)/log(r0+1).It is shown by studying the energy condition and through the graphical analysis that the null energy bounds for the effective energy-momentum tensor are generally violated for the presence of the ordinary matter in modified f(R,G)gravity.Energy conditions associated with the matter content threading the wormhole geometries are evaluated and in general are found to favor the null energy conditions in the vicinity of the wormhole throat,the existence of the nonexotic wormhole geometries threaded by the matter has been confirmed under this gravity.

关 键 词：f(R G)gravity energy conditions WORMHOLES shape function 

分 类 号：P159[天文地球—天文学]