A Study On The Unity Of Dark Matter And Dark Energy

Based on the general relativity and modern cosmology, we mainly discuss thecharacters of dark matter and dark energy. Many models are constructed to explainthem. Moreover, models attempting to unify dark matter and dark energy alsoappeared. In this paper, we attempt to unify dark matter and dark energy combinedwith observation. Then we start from the velocity from observation of NGC3198, andadd the energy-momentum tensor of dark energy into the Einstein field equations tobuild the metric of spherical symmetric spacetime. We get the he spherical symmetricmass density of the dark energy and the mass of the dark energy. Although we haveonly constructed a model that can explain the flat rotation curve of NGC3198,features of other galaxies needing to use the so-call dark matter could also beexplained using the same method in this model.