Using a knot concordance invariant from the Heegaard Floer theory of Ozsvath
and Szabo, we obtain new bounds for the Thurston-Bennequin and rotation numbers
of Legendrian knots in S^3. We also apply these bounds to calculate the knot
concordance invariant for certain knots.Comment: Published by Algebraic and Geometric Topology at
http://www.maths.warwick.ac.uk/agt/AGTVol4/agt-4-20.abs.htm
