%0 Journal Article %T Harnack inequality and applications for stochastic generalized porous media equations %A Feng-Yu Wang %J Mathematics %D 2007 %I arXiv %R 10.1214/009117906000001204 %X By using coupling and Girsanov transformations, the dimension-free Harnack inequality and the strong Feller property are proved for transition semigroups of solutions to a class of stochastic generalized porous media equations. As applications, explicit upper bounds of the $L^p$-norm of the density as well as hypercontractivity, ultracontractivity and compactness of the corresponding semigroup are derived. %U http://arxiv.org/abs/0708.1671v1