Statistical Studies Of Dm Dominated Subhalos

The content of the universe is highly dominated by dark matter (DM). We canrnidentify it using gravitational lensing and it may be detected using direct method,rnafter scattered with the nuclie of germanium which is held underground and indirectrnmethod, after annihilation into electron or positron, which shows a scientilationrneffect. The viable candidates of DMs are weakly interacting particles (WIMPS),rnAxions, MACHOS, Sterile Neutrinos, superWIMPS and gravitinos. All these candidatesrnare studied under super symmetric model, which is the extension of standardrnmodel. In these thesis we are focusing on statistical studies of DM dominatedrnsubhalos. We will describe the statistical distribution of DM using ROCKSTARrnhalo finders. Using marenostrum-multidark simulation of galaxy Clusters, wernanalyse mass to light ratio of the clusters in rrnr200rn. So the mass to light ratio isrnhigh at _ r200. These show that the concentration of DM halos is high at radius ofrnr200. From the statistical studies of all the subhalos we have found that the radialrndistribution of the mass to light DM subhalos is more strongly peaked at r200. Thesernmay suggest that the search for content of DM from subhalos in clusters is mostrnpromising at r200. We also determine the DM fraction for five different clustersrnwith in 30 kpc and the minimum number of particle is 100. We also compare itsrnvalue with in 15 kpc and the minimum number of particle is 50. We found thatrnthe statistical distribution of sub halo is high in 15 kpc than in 30 kpc. But inrnboth cases the concetration of DM is high with in a mass of 1 À€€ 10 _ 1010M0. In ourrnsimulation we are focusing on ROCKSTAR halo finder, but still there are differentrntypes of halo finders such as Amiga halo finder, body density maximum algorithm,rnsurv finder, SUBFIND algorithm and FOF based algorithm. In all condition therndensity distribution of DM is gaussian distribution. We also analyse the existencernof DM by using generalized viral theorm in f(R) gravity. It helps to show that thernmass of DM is dominant in the cluster. Non interacting mathematical model of DM

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