Muhammad Jameel Imtiaz, FA17-RMT-031Dr. Rabia Saleem, Assistant ProfesorLHR TP 56592026-04-212019https://repository.cuilahore.edu.pk/123456789/3662The main focus of this thesis is to investigate an interacting phenomena be tweendarkmatter(DM)-darkenergy(DE)withinanon-flatFriedmann-Lemaitre Robertson-Walker (FLRW) spacetime geometry boundedbyahorizonwithspe cific Ricci cut-off. The Ricci model of DE has been under taken as a cosmic fluid ingredient along with DM. To check consistency of the considered model with astrophysical data coming from recent observations, we assume a positive interaction term Q between two components of fluid along with “Chevallier Polarsky-Linder type parametrization" of the coincidence parameter r(z). By calculating all the physical quantities like energy density and pressure, we con straint the model parameters and found specific region of validity for these pa rameters. It is observed that our model possess a future singularity of Type III. After finding the singular behavior, we examine the nature of our model via cosmological parameters like q, r, s. It is noted that our model is very close to Λcold dark matter (ΛCDM)enDr. Rabia SaleemAssistant ProfesorLHR TP 5659The main focus of this thesis is to investigate an interacting phenomena be tweendarkmatter(DM)-darkenergy(DE)withinanon-flatFriedmann-Lemaitre Robertson-Walker (FLRW) spacetime geometry boundedbyahorizonwithspe cific Ricci cut-off.Thesis