By studying the Heegaard Floer homology of the preimage of a knot inside its double branched cover, we develop simple obstructions to having finite order in the classical smooth concordance group. As an application, we prove that all –bridge knots of crossing number at most for which the smooth concordance order was previously unknown have infinite smooth concordance order.
"Knot concordance and Heegaard Floer homology invariants in branched covers." Geom. Topol. 12 (4) 2249 - 2275, 2008. https://doi.org/10.2140/gt.2008.12.2249