TOPICS

# Taut Foliation

A codimension one foliation of a 3-manifold is said to be taut if for every leaf in the leaf space of , there is a circle transverse to (i.e., a closed loop transverse to the tangent field of ) which intersects .

Taut foliations play a significant role in various aspects of topology and are credited as being one of two major tools (along with incompressible surfaces) responsible for revealing significant topological and geometric information about 3-manifolds (Gabai and Oertel 1989). As such, a considerable amount of research has gone into the study of taut foliations on 3-manifolds. One well-known result is that every taut foliation is necessarily Reebless and that, for any non-taut Reebless foliation, the leaves which don't admit a closed transversal are necessarily tori. Additionally, the closed leaves of a taut foliation are homologically nontrivial.

Some classification results for taut foliations are also known. One such result, attributed by Eliashberg and Thurston to Novikov and Sullivan, says that a foliation on a closed 3-manifold is taut if it is different from the foliation on and satisfies any one of the following:

1. Each leaf of is intersected by a transversal closed curve.

2. There exists a vector field on which is transversal to and preserves a volume form on .

3. admits a Riemannian metric for which all leaves are minimal surfaces.

Moreover, a necessary and sufficient condition for tautness of a foliation is that contain no generalized Reeb components (Goodman 1975).

Foliation, Foliation Leaf, Generalized Reeb Component, Homology, Manifold, Reeb Component, Reeb Foliation

This entry contributed by Christopher Stover

## References

Calegari, D. Foliations and the Geometry of 3-Manifolds. Oxford, England: Clarendon Press, 2007.Eliashberg, Y. M. and Thurston, W. P. Confoliations. Providence, RI: Amer. Math. Soc., 1998.Gabai, D. and Oertel, U. "Essential Laminations in 3-Manifolds." Ann. Math. 130, 41-73, 1989.Goodman, S. "Closed Leaves in Foliations of Codimension One." Comm. Math. Helv. 50, 383-388, 1975.

## Cite this as:

Stover, Christopher. "Taut Foliation." From MathWorld--A Wolfram Web Resource, created by Eric W. Weisstein. https://mathworld.wolfram.com/TautFoliation.html