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In this paper, we use a new asymptotically flat and spherically symmetricsolution in the generalized Einstein-Cartan-Kibble-Sciama (ECKS) theory ofgravity to study the weak gravitational lensing and its shadow cast. To thisend, we first compute the weak deflection angle of generalized ECKS black holeusing the Gauss-Bonnet theorem in plasma medium and in vacuum. Next by usingthe Newman-Janis algorithm without complexification, we derive the rotatinggeneralized ECKS black hole and in the sequel study its shadow. Then, wediscuss the effects of the ECKS parameter on the weak deflection angle andshadow of the black hole. In short, the goal of this paper is to givecontribution to the ECKS theory and look for evidences to understand how theECKS parameter effects the gravitational lensing. Hence, we show that the weakdeflection of black hole is increased with the increase of the ECKS parameter.

Testing Generalized Einstein-Cartan-Kibble-Sciama Gravity using Weak Deflection Angle and Shadow Cast