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Abstract

In the present study, growth rates of non-stationary model of radially gravitating disk with an anisotropic velocity diagram is constructed. We have focused on two oscillation modes i.e. lopsided and bar-like modes. Critical diagrams of the initial virial ratio and rotation parameter are obtained for these two perturbation oscillation modes. A comparative analysis shows that lopsided mode again dominate the bar-like mode, like its isotropic case, against all the values of rotation parameter for anisotropic non-stationary model.