Statistical Studies of Dm Dominated Subhalos

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Addis Ababa University


The content of the universe is highly dominated by dark matter (DM). We can identify it using gravitational lensing and it may be detected using direct method, after scattered with the nuclie of germanium which is held underground and indirect method, after annihilation into electron or positron, which shows a scientilation effect. The viable candidates of DMs are weakly interacting particles (WIMPS), Axions, MACHOS, Sterile Neutrinos, superWIMPS and gravitinos. All these candidates are studied under super symmetric model, which is the extension of standard model. In these thesis we are focusing on statistical studies of DM dominated subhalos. We will describe the statistical distribution of DM using ROCKSTAR halo finders. Using marenostrum-multidark simulation of galaxy Clusters, we analyse mass to light ratio of the clusters in r r200 . So the mass to light ratio is high at _ r200. These show that the concentration of DM halos is high at radius of r200. From the statistical studies of all the subhalos we have found that the radial distribution of the mass to light DM subhalos is more strongly peaked at r200. These may suggest that the search for content of DM from subhalos in clusters is most promising at r200. We also determine the DM fraction for five different clusters with in 30 kpc and the minimum number of particle is 100. We also compare its value with in 15 kpc and the minimum number of particle is 50. We found that the statistical distribution of sub halo is high in 15 kpc than in 30 kpc. But in both cases the concetration of DM is high with in a mass of 1 􀀀 10 _ 1010M0. In our simulation we are focusing on ROCKSTAR halo finder, but still there are different types of halo finders such as Amiga halo finder, body density maximum algorithm, surv finder, SUBFIND algorithm and FOF based algorithm. In all condition the density distribution of DM is gaussian distribution. We also analyse the existence of DM by using generalized viral theorm in f(R) gravity. It helps to show that the mass of DM is dominant in the cluster. Non interacting mathematical model of DM



Statistical Studies, Dm Dominated, Subhalos, Dark Matter Particles, WIMPS and MACHO