-
Twisted Alexander Polynomials and Symplectic Structures
- American Journal of Mathematics
- Johns Hopkins University Press
- Volume 130, Number 2, April 2008
- pp. 455-484
- 10.1353/ajm.2008.0014
- Article
- Additional Information
Let N be a closed, oriented 3-manifold. A folklore conjecture states that S1 × N admits a symplectic structure only if N admits a fibration over the circle. The purpose of this paper is to provide evidence to this conjecture studying suitable twisted Alexander polynomials of N, and showing that their behavior is the same as of those of fibered 3-manifolds. In particular, we will obtain new obstructions to the existence of symplectic structures and to the existence of symplectic forms representing certain cohomology classes of S1 × N. As an application of these results we will show that S1 × N(P) does not admit a symplectic structure, where N(P) is the 0-surgery along the pretzel knot P = (5, -3, 5), answering a question of Peter Kronheimer.