Unified First Law and Thermodynamics of Dynamical Black Hole in n-dimensional Vaidya Spacetime

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As a simple but important example of dynamical black hole, we analysis the dynamical black hole in n-dimensional Vaidya spacetime in detail. We investigated the thermodynamics of field equation in n-dimensional Vaidya spacetime. The unified first law was derived in terms of the methods proposed by Sean A Hayward. The first law of dynamical black hole was obtained by projecting the unified first law along the trapping horizon. At last, the second law of dynamical black hole is also discussed.