We first prove rigidity results for pseudo-Anosov flows in prototypes of toroidal
–manifolds:
we show that a pseudo-Anosov flow in a Seifert fibered manifold is up to finite covers
topologically equivalent to a geodesic flow and we show that a pseudo-Anosov flow in
a solv manifold is topologically equivalent to a suspension Anosov flow. Then we
study the interaction of a general pseudo-Anosov flow with possible Seifert fibered
pieces in the torus decomposition: if the fiber is associated with a periodic orbit of
the flow, we show that there is a standard and very simple form for the flow
in the piece using Birkhoff annuli. This form is strongly connected with
the topology of the Seifert piece. We also construct a large new class of
examples in many graph manifolds, which is extremely general and flexible.
We construct other new classes of examples, some of which are generalized
pseudo-Anosov flows which have one-prong singularities and which show that
the above results in Seifert fibered and solvable manifolds do not apply to
one-prong pseudo-Anosov flows. Finally we also analyse immersed and embedded
incompressible tori in optimal position with respect to a pseudo-Anosov
flow.