• Ali Shojai

      Articles written in Pramana – Journal of Physics

    • Quantum Einstein’s equations and constraints algebra

      Fatimah Shojai Ali Shojai

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      In this paper we shall address this problem: Is quantum gravity constraints algebra closed and what are the quantum Einstein’s equations. We shall investigate this problem in the de-Broglie-Bohm quantum theory framework. It is shown that the constraint algebra is weakly closed and the quantum Einstein’s equations are derived.

    • On the Bohmian quantum friction

      Fatimah Shojai Ali Shojai

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      The problem of quantum friction in the framework of Bohmian quantum mechanics is studied. The appropriate equations for such a system is written and solved exactly for some cases. Also two approximate solutions are found which represent the transition of a system from an upper state to the ground state caused by the friction. The physical nature of these solutions are examined.

    • Non-minimal quintessence: Dynamics and coincidence problem

      Fatimah Shojai Ali Shojai

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      Brans–Dicke scalar–tensor theory provides a conformal coupling of the scalar field with gravity in Einstein’s frame. This model is equivalent to an interacting quintessence in which dark matter is coupled to dark energy. This provides a natural mechanism to alleviate the coincidence problem. We investigate the dynamics of this model and show that it leads to comparable dark energy and dark matter densities today.

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