Journal of Symplectic Geometry
Volume 14 (2016)
Four-ball genus bounds and a refinement of the Ozsváth–Szabó tau invariant
Pages: 305 – 323
Based on work of Rasmussen, we construct a concordance invariant associated to the knot Floer complex, and exhibit examples in which this invariant gives arbitrarily better bounds on the 4-ball genus than the Ozsváth–Szabó $\tau$ invariant.
Published 24 June 2016