Isotropization of non-diagonal Bianchi I spacetimes with collisionless matter

Ernesto Nungesser

Assuming that the spacetime is close to isotropic in the sense that the shear parameter is small and that one has certain control over the maximum velocities of the particles, we have been able to show that non-diagonal Bianchi I spacetimes with collisionless matter behave at late times as the dust case. Recent results on the generalization of this case will be discussed.