  We consider the question of which Dehn surgeries along a given knot bound
rational homology balls. We use Ozsv\'ath and Szab\'o's correction terms in
Heegaard Floer homology to obtain general constraints on the surgery
coefficients. We then turn our attention to the case of integral surgeries,
with particular emphasis on positive torus knots. Finally, combining these
results with a lattice-theoretic obstruction based on Donaldon's theorem, we
classify which integral surgeries along torus knots of the form $T_{kq\pm 1,q}$
bound rational homology balls.
