Partition function zeros and leading-order scaling correction of the 3D Ising model from multicanonical simulations

The density of states for the three-dimensional Ising model is calculated w ith high precision by means of multicanonical simulations. This allows us t o estimate the leading partition function zeros for lattice sizes up to L = 32. We have evaluated the critical exponent nu and the correction to scali ng through an analysis of a multi-parameter fit and of the Bulirsch-Stoer ( BST) extrapolation algorithm. The performance of the BST algorithm is also explored in case of the 2D Ising model, where the exact partition function zeros are known.