Fractal dimension of random attractors for nonautonomous stochastic strongly damped wave equations on RN

In this article, we investigate the dynamics of a nonautonomous stochastic strongly damped wave equation defined on Double-struck capital R-N. We first use the energy equation and tail-estimates to prove the asymptotic compactness of the solutions and obtain the existence of a unique pullback random attractor for the equation with critical nonlinearity. Then, we give an upper bound of fractal dimension of the random attractor when the nonlinearity is of subcritical growth. The unboundedness of the physical space will impose difficulties on the estimation for the upper bound of fractal dimension of the random attractor.