Aspects of non-singular bounce in modified gravity theories

Scenario of a bouncing universe is one the most active area research to arrive at singularity free cosmological models. Different proposals have been suggested avoid so called ‘big bang’ through quantum aspect gravity which yet proper understanding. In this work, on contrary, we consider three different approaches, each goes beyond General Relativity but remain within domain classical scenario, address problem. The hallmark all these approaches that origin mechanism somewhat natural geometrical framework model without any need incorporating external source by hand. context scenarios, also discuss various constraints viable models satisfy.