Ergodic theory, von Neumann algebras and nonsingular Bernoulli actions

Standard measure preserving Bernoulli actions of discrete groups are among the most well studied group actions in ergodic theory, measurable group theory and von Neumann algebras. By varying the base probability measures, one obtains non measure preserving Bernoulli actions with potentially equally interesting properties. We study these nonsingular actions, their ergodicity properties and Krieger type.